CN218449522U

CN218449522U - Dual lithium electrical activation system

Info

Publication number: CN218449522U
Application number: CN202221942789.9U
Authority: CN
Inventors: 杨桂贤; 陈勇; 李珂; 刘裕涛
Original assignee: Shenzhen Shuori New Energy Technology Co ltd
Current assignee: Shenzhen Shuorixin Energy Technology Co.,Ltd.
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2023-02-03
Anticipated expiration: 2032-07-25

Abstract

The utility model discloses a two lithium electricity activation systems, include: the photovoltaic power generation system comprises a photovoltaic input end, a mains supply input end, a battery, a mains supply activation unit and a photovoltaic activation unit, wherein the photovoltaic input end is used for outputting photovoltaic electric energy; the commercial power input end is used for outputting commercial power electric energy; a battery for storing or providing electrical energy; the commercial power activation unit is connected between the commercial power input end and the battery and used for receiving commercial power and providing the commercial power to the battery to activate the battery; and the photovoltaic activation unit is connected between the photovoltaic input end and the battery/commercial power activation unit, and is used for receiving photovoltaic electric energy and providing the photovoltaic electric energy for the battery to activate the battery. Through this neotype, when the battery was in dormant state, both can come the activation battery through the commercial power, can also come the activation battery through the photovoltaic, increased new activation way, improved the reliability and the efficiency of activation.

Description

Dual lithium electrical activation system

Technical Field

The utility model relates to a photovoltaic technology field especially relates to a two lithium electricity activation systems.

Background

With the attention of the world to energy problems, people expect green energy more and more, and the development and utilization of renewable energy, especially solar energy, are promoted. The photovoltaic power generation system based on solar power generation has the advantages of safety, no pollution, high reliability and the like. The photovoltaic off-grid energy storage inverter which is a key component converts direct current output by the array into alternating current and uploads the alternating current to a power grid.

The traditional lead-acid battery charging function is simple to apply, the requirements on the development of a lithium battery and the arrangement reliability of the battery are improved, a BMS (battery management system) with a lithium battery built-in protection function is adopted, the BMS can lock the output of the battery on the conditions of conventional faults or over-discharge of the battery, when no intelligent activation technology is realized, the engineering application difficulty is greatly increased by artificial activation, the alternating current intelligent activation technology function of the lithium battery in the industry can only solve part of problems, when the alternating current power supply in remote areas is difficult or cannot supply power to the areas (such as underdeveloped countries or areas), the alternating current cannot be provided, and the alternating current intelligent activation only brings great difficulty to the engineering application.

Therefore, the maintenance of a large number of products becomes a pain point of the industry, wherein the lithium battery can be locked and output under the protection mechanism of the BMS under the condition of conventional faults or overdischarging, and the artificial activation function needs a large amount of manpower, so that the engineering application difficulty is high, the time is also consumed, and the product efficiency is greatly reduced; the AC intelligent activation function also has the regional problem of difficult AC power supply. Therefore, the industry is also currently seeking a technology for activating a lithium battery of a photovoltaic off-grid energy storage inverter, which solves the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model provides a aim at providing a two lithium electricity activation system, aim at solving current remote area and can't provide the alternating current and be difficult to carry out the problem activated to the battery.

In a first aspect, the present invention provides a dual lithium electrical activation system, comprising: the photovoltaic power generation system comprises a photovoltaic input end, a mains supply input end, a battery, a mains supply activation unit and a photovoltaic activation unit, wherein the photovoltaic input end is used for outputting photovoltaic electric energy; the commercial power input end is used for outputting commercial power electric energy; a battery for storing or providing electrical energy; the commercial power activation unit is connected between the commercial power input end and the battery and used for receiving commercial power and providing the commercial power to the battery to activate the battery; and the photovoltaic activation unit is connected between the photovoltaic input end and the battery or between the photovoltaic input end and the commercial power activation unit, and is used for receiving photovoltaic electric energy and providing the photovoltaic electric energy for the battery to activate the battery.

Further, the commercial power activation unit comprises a bidirectional full-bridge DC/AC circuit, a buck-boost bidirectional DC/DC circuit and a bidirectional full-bridge DC/DC circuit, the bidirectional full-bridge DC/AC circuit is connected with the commercial power input end, the buck-boost bidirectional DC/DC circuit is connected between the bidirectional full-bridge DC/AC circuit and the bidirectional full-bridge DC/DC circuit, and the bidirectional full-bridge DC/DC circuit is connected with the battery.

Further, the bidirectional full-bridge DC/AC circuit includes an inverter circuit, and the inverter circuit is configured to convert the alternating current input by the utility power input terminal into a direct current.

Further, the BUCK-BOOST bidirectional DC/DC circuit comprises a BUCK-BOOST circuit, and the BUCK-BOOST circuit is used for carrying out BUCK on the direct current converted by the inverter circuit.

Further, the bidirectional full-bridge DC/DC circuit comprises an LLC circuit, and the LLC circuit is used for providing resonance and boosting the voltage after the BUCK-BOOST circuit is stepped down so as to activate the battery.

Further, the photovoltaic input end is connected with a load through the bidirectional full-bridge DC/AC circuit.

Further, the mains input end is also used for connecting a load.

Further, the photovoltaic input end is a high-voltage photovoltaic input end, the photovoltaic activation unit comprises a BUCK circuit, the BUCK circuit is connected to the BUCK-BOOST circuit, and after the voltage provided by the high-voltage photovoltaic input end is subjected to voltage reduction twice through the BUCK circuit and the BUCK-BOOST circuit, the voltage is boosted through the LLC circuit, and the battery is activated through resonance.

Further, the photovoltaic input end is low voltage photovoltaic input end, the photovoltaic activation unit includes the BUCK circuit, the BUCK circuit connect in between photovoltaic input end and the battery, the BUCK circuit is used for stepping down the voltage that low voltage photovoltaic input end provided, and then activates the battery.

Compared with the prior art, the beneficial effects of the utility model are that: the battery is activated by adding the photovoltaic input end and the photovoltaic activation unit, the photovoltaic input end is connected with the battery through the photovoltaic activation unit, the mains supply input end is also connected with the battery through the mains supply activation unit, when the battery is in a dormant state, the battery can be activated through mains supply, and the battery can be activated through photovoltaic.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present invention, the drawings required to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 illustrates a schematic diagram of a dual lithium electrical activation system according to an embodiment of the present invention;

fig. 2 illustrates a low voltage topology circuit diagram of a dual lithium electrical activation system in accordance with an embodiment of the present invention;

FIG. 3 illustrates a schematic diagram of a dual lithium electro-active system according to another embodiment of the present invention;

fig. 4 illustrates a high voltage topology circuit diagram of a dual lithium electrical activation system of an embodiment of the present invention;

fig. 5 illustrates a flow chart of an activation process of a dual lithium electrical activation system in accordance with an embodiment of the present invention;

10. a photovoltaic input; 20. a mains supply input end; 30. a battery; 40. a mains activation unit; 41. a BUCK circuit; 50. a photovoltaic activation unit; 51. an inverter circuit; 52. a BUCK-BOOST circuit; 53. an LLC circuit; 60. and (4) loading.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be further understood that the term "and/or" as used in the specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items and includes such combinations.

The embodiment of the application solves the problem that the existing battery is difficult to activate without alternating current in remote areas by providing a double-lithium electric activation system, and improves the reliability and the activation efficiency of battery activation by adding a photovoltaic activation unit and activating the battery by using the electric energy provided by photovoltaic.

In order to solve the problem of battery activation, the technical scheme in the embodiment of the application has the following general idea:

the application provides an intelligent double-lithium electric activation technology which comprises a photovoltaic intelligent active lithium battery technology and an alternating current intelligent active lithium battery technology. The photovoltaic intelligent activation lithium battery technology is characterized in that a lithium battery is activated through a buck circuit when photovoltaic input is low voltage, or the lithium battery is activated through the buck circuit and a buck-boost circuit for secondary voltage reduction when the photovoltaic input is high voltage, and then through LLC circuit resonance and voltage boosting; the technology of the alternating current intelligent activation lithium battery is characterized in that alternating current is converted into direct current through an inverter circuit, voltage is reduced through a buck-boost circuit, and the lithium battery is activated by means of LLC voltage boosting and resonance. In the whole process, the commercial power, the photovoltaic and the lithium battery can be converted through the circuit, and stable alternating current is output to the load. The intelligent double-lithium electro-activation technology functional product of the photovoltaic off-grid energy storage inverter lithium battery effectively solves the problems, and can also rely on photovoltaic power generation and circuit conversion to activate the battery in areas where manpower and electric power are difficult to reach, so that the maintenance cost of the photovoltaic off-grid energy storage inverter is greatly reduced, the working efficiency is improved, and the first realization and innovation of the wide application of engineering in the field are realized.

In order to better understand the technical scheme, the technical scheme is described in detail in the following with reference to the attached drawings of the specification and specific embodiments.

Referring to fig. 1 and 2, an embodiment of the present invention shows a battery 30 activation circuit, including: the photovoltaic power generation system comprises a photovoltaic input end 10, a mains supply input end 20, a battery 30, a mains supply activation unit 50 and a photovoltaic activation unit 40, wherein the photovoltaic input end 10 is used for outputting photovoltaic power; a commercial power input terminal 20 for outputting commercial power; a battery 30 for storing electric energy or supplying electric energy; a commercial power activation unit 50 connected between the commercial power input terminal 20 and the battery 30, wherein the commercial power activation unit 50 is configured to receive commercial power and provide the commercial power to the battery 30 to activate the battery 30; a photovoltaic activation unit 40 connected between the photovoltaic input end 10 and the battery 30 or between the photovoltaic input end 10 and the utility power activation unit 50, wherein the photovoltaic activation unit 40 is configured to receive photovoltaic power and provide the photovoltaic power to the battery 30 to activate the battery 30.

By implementing the embodiment, the battery 30 is activated by two activation modes, namely the commercial power activation unit 50 and the photovoltaic activation unit 40, so that the battery 30 can be activated by commercial power and can also be activated by photovoltaic, even in areas where manpower and electric power are difficult to reach, the battery 30 can be activated by photovoltaic power generation through circuit conversion, the maintenance cost of the photovoltaic off-grid energy storage inverter is greatly reduced, and the working efficiency is improved.

In an embodiment, the photovoltaic input end is a low-voltage photovoltaic input end, the photovoltaic activation unit includes a BUCK circuit 41, the BUCK circuit is connected between the photovoltaic input end 10 and the battery 30, and the BUCK circuit 41 is configured to step down a voltage provided by the low-voltage photovoltaic input end, so as to activate the battery.

Specifically, the photovoltaic input end 10 refers to an output end of a photovoltaic module, the photovoltaic module converts solar energy into electric energy, and the electric energy is provided to the battery 30 through the photovoltaic input end 10, the photovoltaic input end 10 of the embodiment is a low-voltage photovoltaic input end, the low voltage refers to an input voltage of inverter photovoltaic, and the photovoltaic input voltage of a low-voltage type is 30-85V. The BUCK circuit 41 is a BUCK conversion circuit, and mainly functions to step down a voltage provided by the photovoltaic, and then input the stepped-down voltage to the battery 30, thereby activating the battery 30. The BUCK circuit 41 in this embodiment includes a capacitor C1, an inductor L3, and a diode S16, where the inductor L3 is connected between the positive photovoltaic electrode and the positive electrode of the battery 30, the capacitor C1 is connected between the inductor L3 and the negative electrode of the battery 30, and the diode S16 is also connected between the inductor L3 and the negative electrode of the battery 30. The battery 30 is activated after the electric energy provided by the photovoltaic is reduced by the BUCK circuit 41, the photovoltaic activation is realized, a new activation way is added, and the reliability and the activation efficiency of the battery 30 are improved

In an embodiment, the mains activation unit 50 includes a bidirectional full-bridge DC/AC circuit, a buck-boost bidirectional DC/DC circuit, and a bidirectional full-bridge DC/DC circuit, the bidirectional full-bridge DC/AC circuit is connected to the mains input terminal 20, the buck-boost bidirectional DC/DC circuit is connected between the bidirectional full-bridge DC/AC circuit and the bidirectional full-bridge DC/DC circuit, and the bidirectional full-bridge DC/DC circuit is connected to the battery 30.

In the present embodiment, the commercial power activation unit 50 is formed by a bidirectional full-bridge DC/AC circuit, a buck-boost bidirectional DC/DC circuit, and a bidirectional full-bridge DC/DC circuit. The bidirectional full-bridge DC/AC circuit may be configured to implement bidirectional current conversion, convert direct current into alternating current, and convert alternating current into direct current, when the battery 30 supplies power to the load 60, the bidirectional full-bridge DC/AC circuit implements direct current conversion into alternating current, and when the mains input terminal 20 activates the battery 30, the bidirectional full-bridge DC/AC circuit implements alternating current conversion into direct current. The buck-boost bidirectional DC/DC circuit can realize bidirectional buck-boost, when the battery 30 supplies power to the load 60, the buck-boost bidirectional DC/DC circuit boosts the voltage, and when the commercial power input end 20 activates the battery 30, the buck-boost bidirectional DC/DC circuit reduces the voltage. The bidirectional full-bridge DC/DC circuit mainly plays a role of bidirectional voltage stabilization, and may play a role of voltage stabilization when the battery 30 supplies power to the load 60, and may also play a role of voltage stabilization when the commercial power input terminal 20 activates the battery 30. By implementing the present embodiment, the activation of the mains activation unit 50 is implemented by a bidirectional conversion circuit, which may enable the mains input 20 to activate the battery 30 through the mains activation unit 50 on the one hand, and enable the battery 30 to supply power to the load 60 on the other hand.

Referring to fig. 2, in an embodiment, the bidirectional full-bridge DC/AC circuit includes an inverter circuit 51, and the inverter circuit 51 is used for converting an alternating current input to the mains input terminal into a direct current (AC-DC). Specifically, the inverter circuit 51 includes a capacitor C4, an inductor L2, and diodes (S11, S12, S13, S14), two ends of the capacitor C4 are used for connecting to the load 60 to provide an ac output, two ends of the capacitor C4 are further connected to the positive electrode and the negative electrode of the utility power input terminal 20, the diode S11 is connected in series with the diode S12, the diode S13 is connected in series with the diode S14, the diode S11 and the diode S12 are connected in parallel with the diode S13 and the diode S14, one end of the inductor L2 is connected between the diode S11 and the diode S12, the other end is connected to the capacitor C4, and the capacitor C4 is further connected to the support of the diode S13 and the diode S14. The ac power of the utility power can be converted into dc power by the inverter circuit 51 to provide the battery activation voltage.

With continued reference to fig. 2, in an embodiment, the BUCK-BOOST bidirectional DC/DC circuit includes a BUCK-BOOST circuit 52, and the BUCK-BOOST circuit 52 is configured to BUCK the DC power converted by the inverter circuit 51. Specifically, the BUCK-BOOST circuit 52 includes capacitors (C2, C3) and an inductor L1 and diodes (S9, S10), the inverter circuit 51 is connected to both ends of the capacitor C3, the diode S9 and the capacitor C2 are both connected in parallel to the capacitor C3, the inductor L1 is connected in series to the diode S10, one end of the inductor L1 is connected to the capacitor C2, and one end of the diode S10 is connected to the capacitor C3. The battery 30 is activated by stepping down the mains input power through the BUCK-BOOST circuit 52.

With continued reference to fig. 2, in one embodiment, the bidirectional full-bridge DC/DC circuit includes an LLC circuit 53, the LLC circuit 53 is configured to provide resonance and BOOST the voltage dropped by the BUCK-BOOST circuit 52 to activate the battery 30. Specifically, the LLC circuit 53 is a resonant circuit including a transformer TX and diodes (S1, S2, S3, S4, S5, S6, S7, S8), the diode S1 is connected in series with the diode S2, the diode S3 is connected in series with the diode S4, the diode S5 is connected in series with the diode S6, the diode S7 is connected in series with the diode S8, each two diodes are connected in parallel after being connected in series, one end of a primary side of the transformer is connected between the diode S1 and the diode S2, the other end of the primary side of the transformer is connected between the diode S3 and the diode S4, one end of a secondary side of the transformer is connected between the diode S5 and the diode S6, the other end of the secondary side of the transformer is connected between the diode S7 and the diode S8, the diode S1 is further connected with an anode of the battery 30, the diode S2 is further connected with a cathode of the battery 30, and the diodes S7 and S8 are further connected in parallel with a capacitor C2 of the BUCK-BOOST circuit 52. Boosting is performed by the LLC circuit 53 to activate the battery 30.

With continued reference to fig. 2, in this embodiment, the photovoltaic input 10 is connected to a load 60 through the bi-directional full-bridge DC/AC circuit. The mains input 20 is also used for connecting a load 60. Specifically, the direct current input from the photovoltaic input terminal 10 is inverted by the bidirectional full-bridge DC/AC circuit to be converted into an alternating current to supply power to the load 60. The mains input 20 may directly power the load 60. That is, during the whole activation process of the battery 30, the photovoltaic power can also supply power to the load 60 alone, the utility power can also supply power to the load 60 alone, or the photovoltaic power and the utility power and the battery 30 supply power to the load 60 at the same time,

referring to fig. 3 and 4, in another embodiment, the photovoltaic input terminal is a high-voltage photovoltaic input terminal, the photovoltaic activation unit includes a BUCK circuit 41, the BUCK circuit 41 is connected to the BUCK-BOOST circuit 52, and after the voltage provided by the high-voltage photovoltaic input terminal is stepped down twice by the BUCK circuit 41 and the BUCK-BOOST circuit 52, the LLC circuit 53 resonates and steps up the voltage to activate the battery 30. Specifically, the high voltage refers to the photovoltaic input voltage of the inverter, and the photovoltaic input voltage of a high-voltage machine type is 120-450V. The difference between the high-voltage circuit structure and the low-voltage circuit structure is only different between the photovoltaic activated cells, and since the photovoltaic input voltage of the high-voltage type is too high, the voltage needs to be reduced twice through the BUCK circuit 41 and the BUCK-BOOST circuit 52, and other circuits are the same, which are not described again.

The embodiment of the utility model provides a photovoltaic power generation system has still been demonstrated, including battery 30 activation circuit, the above-mentioned embodiment of battery 30 activation circuit. The activation circuit of the battery 30 has been described in detail in the above embodiments, and will not be described in detail here.

Referring to fig. 5, the activation process of the battery 30 of the present embodiment is described in detail below:

s1: it is judged whether the voltage of the battery 30 is less than 0.5 times the cut-off voltage and the battery 30 is in the connected state.

S2: if yes, the battery 30 is judged to be in a dormant state, and a fault code 03 is displayed on the screen.

S3: the system selects one between photovoltaic and utility to provide an activation voltage to the battery 30 based on current industrial control.

S4: judging whether the voltage of the battery 30 is greater than the cut-off voltage and the charging current is greater than 3A when the system is charged;

s5: judging whether the voltage of the battery 30 is greater than the cut-off voltage when the system is not charging;

s6: if yes, the battery 30 is successfully activated and the screen eliminates 03 the fault code.

In the present embodiment, the determination that the battery 30 is in the sleep state is based on the determination conditions such as the cut-off voltage and the connection state of the battery 30, but it is understood that other determination conditions may be used, specifically based on actual requirements. The screen display 03 indicates that the battery 30 is in a sleep state or a no battery 30 state. After the battery 30 is determined to be in the dormant state, the battery 30 activation circuit starts to work, the battery 30 is activated through the commercial power or the photovoltaic power according to the current working condition, and when the commercial power and the photovoltaic power exist at the same time, the commercial power activation is preferentially selected. There are two ways of determining whether the battery 30 is successfully activated. One of them is that when the system is charging, that is, the photovoltaic or the commercial power is charging the battery 30, it is detected whether the voltage and the current of the battery 30 satisfy the condition, and if the condition is satisfied, it indicates that the battery 30 has been successfully activated. The other is that the system is not charging, and directly detects the voltage of the battery 30, and detects whether the voltage of the battery 30 satisfies the condition, which means that the battery 30 has been successfully activated. After the battery 30 is successfully activated, the battery returns to a state of voltage higher than the cut-off voltage, and the battery 30 is gradually charged to full charge, which in turn can participate in supplying power to the load 60.

By implementing the present embodiment, the intelligent "dual lithium electrical activation technology" includes photovoltaic smart active lithium battery 30 technology and alternating current smart active lithium battery 30 technology. The photovoltaic intelligent activation lithium battery technology is characterized in that a lithium battery is activated through a buck circuit when photovoltaic input is low voltage, or the lithium battery is activated through the buck circuit and a buck-boost circuit for secondary voltage reduction when the photovoltaic input is high voltage, and then through LLC circuit resonance and voltage boosting; the technology of the alternating current intelligent activation lithium battery is characterized in that alternating current is converted into direct current through an inverter circuit, voltage is reduced through a buck-boost circuit, and the lithium battery is activated by means of LLC voltage boosting and resonance. In the whole process, the system can freely switch between the photovoltaic intelligent activation lithium battery 30 technology and the alternating current intelligent activation lithium battery 30 technology according to the current working condition so as to achieve the optimal effect.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not intended to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit and principles of the present invention should be included within the scope of the present invention.

Claims

1. A dual lithium electrical activation system, comprising:

the photovoltaic input end is used for outputting photovoltaic electric energy;

the commercial power input end is used for outputting commercial power electric energy;

a battery for storing or providing electrical energy;

the commercial power activation unit is connected between the commercial power input end and the battery and used for receiving commercial power and providing the commercial power to the battery to activate the battery;

the photovoltaic activation unit is connected between the photovoltaic input end and the battery or between the photovoltaic input end and the commercial power activation unit, and the photovoltaic activation unit is used for receiving photovoltaic electric energy and providing the photovoltaic electric energy for the battery to activate the battery.

2. The system of claim 1, wherein the mains activation unit comprises a bi-directional full-bridge DC/AC circuit, a buck-boost bi-directional DC/DC circuit, and a bi-directional full-bridge DC/DC circuit, the bi-directional full-bridge DC/AC circuit connected to the mains input, the buck-boost bi-directional DC/DC circuit connected between the bi-directional full-bridge DC/AC circuit and the bi-directional full-bridge DC/DC circuit, the bi-directional full-bridge DC/DC circuit connected to the battery.

3. The system of claim 2, wherein the bidirectional full-bridge DC/AC circuit comprises an inverter circuit for converting AC power inputted from the mains input into DC power.

4. The dual lithium electrical activation system of claim 3, wherein the BUCK-BOOST bi-directional DC/DC circuit comprises a BUCK-BOOST circuit for stepping down the direct current converted by the inverter circuit.

5. The system of claim 4, wherein the bi-directional full bridge DC/DC circuit comprises an LLC circuit to provide resonance and BOOST the voltage stepped down by the BUCK-BOOST circuit to activate the battery.

6. The dual lithium electrical activation system of claim 5, wherein the photovoltaic input is connected to a load through the bi-directional full bridge DC/AC circuit.

7. The dual lithium electrical activation system according to claim 6, wherein the mains input is further configured to connect to a load.

8. The dual-lithium electrical activation system according to claim 5, wherein the photovoltaic input is a high voltage photovoltaic input, the photovoltaic activation unit comprises a BUCK circuit, the BUCK circuit is connected to the BUCK-BOOST circuit, wherein the voltage provided by the high voltage photovoltaic input is twice stepped down by the BUCK circuit and the BUCK-BOOST circuit, and the voltage is stepped up by the LLC circuit and resonated to activate the battery.

9. The system of any of claims 1-7, wherein the photovoltaic input is a low voltage photovoltaic input, and wherein the photovoltaic activation unit comprises a BUCK circuit connected between the photovoltaic input and the battery, the BUCK circuit configured to step down a voltage provided at the low voltage photovoltaic input to activate the battery.