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Battery Storage and Recharge
Battery Acceptance Inspection
A battery recharge label must be put on the battery packing case. The recharge label should contain the latest charge time and the next recharge time.
Battery Storage Requirements
- Place batteries according to the signs on the packing case during storage. Do not put batteries upside down or sidelong.
- Stack battery packing cases by complying with the stacking requirements on the external package.
- Handle batteries with caution to avoid damage.
The storage environment requirements are as follows:
- Ambient temperature: -10–55°C; recommended storage temperature: 20–30°C
- Relative humidity: 5% to 80%
- Place batteries in a dry and clean place with proper ventilation.
- Place batteries in a place that is away from corrosive organic solvents and gases.
- Keep batteries away from direct sunlight.
- Keep batteries at least 2 meters away from heat sources.
- The batteries in storage must be disconnected from external devices. The indicators (if any) on the batteries should be off.
- AC mains input voltage requirements in the recharge places: single-phase power grid: 220 V/230 V/240 V, ±10%; three-phase voltage: 380 V/400 V, ±10%.
- The warehouse keeper should collect battery storage information every month and periodically report the battery inventory information to the planning department. The batteries that have been stored for nearly 15 months (-10–25°C) 、9 months (25–35°C) or 6 months (35–55°C) should be recharged in a timely manner.
- Regional offices or organizations should not store batteries.
- Batteries should be delivered based on the "first in, first out" rule.
- After the battery production test is complete and before the batteries are stored, the batteries must be recharged to at least 50% of the SOC.
Conditions for Judging Overdue Storage
It is recommended that batteries not be stored for a long period. They should be used soon after being deployed onsite. The batteries should be handled according to the following requirements.
Table 7-3 Lithium battery recharge interval
Required Storage Temperature |
Actual Storage Temperature |
Recharge Interval |
Remarks |
|---|---|---|---|
-10°C–55°C |
T≤-10℃ |
Not allowed |
Not reaching the time for recharge: Use the batteries as soon as possible. Reaching the time for recharge: Recharge the batteries. The total storage duration should not exceed the warranty period. |
-10℃＜T≤25℃ |
15 months |
||
25℃＜T≤35℃ |
9 months |
||
35℃＜T≤55℃ |
6 months |
||
55℃＜T |
Not allowed |
- Dispose of deformed, damaged, or leaking batteries directly irrespective of how long they have been stored.
- The storage duration starts from the latest charge time labeled on the battery package. If a battery is qualified after recharge, update the latest charge time and the next recharge time (next recharge time = latest charge time + recharge interval) on the label.
- The maximum power storage period of a lithium battery is three years. A lithium battery can be recharged at most for three times within the three years. For example, it can be recharged every 8 months or every 12 months. It is recommended that batteries be scrapped if the maximum allowable storage period and recharging times are exceeded.
- If a lithium battery is stored for a long time, capacity loss may occur. After a lithium battery is stored for 12 months in the recommended storage temperature, the irreversible capacity loss rate is 3%–10%. If customers perform the discharge test according to the specifications, they may fail to pass the test if the storage capacity of the battery is not 100% of the rated capacity.
Inspection Before Recharge
- Before recharging a battery, you need to check its appearance. Recharge the battery if it is qualified or dispose of it if not.
- The battery is qualified if it is free from the following symptoms:
- Deformation
- Shell damage
- Leakage
Battery Recharging Scenarios
Three-Phase Power Supply Scenario
- The SUN2000-10KTL-M1 provides 10 kW power to charge batteries. It allows two charge units (six battery packs) to be charged at the same time. Other models can charge batteries with a power of less than 10 kW.
Figure 7-1 Networking diagram for three-phase power supply scenario
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(C) SUN2000-10KTL-M1 |
(D) AC switch |
(E) ACDU |
(G) Power grid |
(H) LUNA2000 |
(M) FusionSolar app |
Single-phase power supply scenario
- The SUN2000-(3KTL-6KTL)-L1 provides 3 kW power to charge batteries. It allows one charge unit (three battery packs) to be charged at the same time.
Figure 7-2 Networking diagram for single-phase power supply scenario
![]()
(C) SUN2000-(3KTL-6KTL)-L1 |
(D) AC switch |
(E) ACDU |
(G) Power grid |
(H) LUNA2000 |
(M) FusionSolar app |
Battery Recharging Cable Connection
Connect cables by referring to Electrical Connection. If two charge units need to be charged at the same time, cascade the batteries by referring to (Optional) Cascading Batteries.
Figure 7-3 Cable connection diagram
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Battery Power-On and Commissioning
- For details about how to store and recharge the battery, see the Lithium Battery Storage and Recharge Guide.
- Ensure that the charge process is supervised to prevent any abnormality.
- If a battery experiences an abnormality such as bulging or smoking, stop charging immediately and dispose of it.
- Ensure that only trained professionals perform recharge operations.
- After turning on the battery switch, power on the inverter. For details about how to power on the inverter, see the quick guide for the corresponding inverter model.
- When the battery SOC is 0%, the battery cannot be activated by holding the black start button. The battery can be started only after both the DC and AC power supplies are connected.
- It is recommended that the battery be charged to 50% SOC. Long-term storage will cause capacity loss, after a lithium battery is stored for 12 months in the recommended storage temperature, the irreversible capacity loss rate is 3%–10%.
- Connect power cables and communications cables correctly.
- Turn on the battery power pack switch by turning the DC switch to ON.
- Turn on the AC switch between the inverter and the grid.
- Check that LED1 is steady green, LED2 is steady green, and LED3 is blinking green slowly.
- Hold down the black start button for 5s to activate the battery. The power control module LED blinks three times and then the green indicator is steady on. The battery comprehensive LED blinks three times and then the green indicator is steady on. The ring LED blinks three circles.
- Connect the FusionSolar app to the inverter, the operation procedure will be updated later.
- Confirm that the recharge is complete if five indicators of the ring LED are on and the comprehensive LED of the battery expansion modules is steady green.
- After the battery is charged, switch off the inverter input AC circuit breaker and then the battery input circuit breaker. If other batteries need to be charged, repeat the preceding steps.
