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

1. Place batteries according to the signs on the packing case during storage. Do not put batteries upside down or sidelong.
2. Stack battery packing cases by complying with the stacking requirements on the external package.
3. Handle batteries with caution to avoid damage.

4. 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.
5. The batteries in storage must be disconnected from external devices. The indicators (if any) on the batteries should be off.
6. 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%.
7. 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
8. Batteries should be delivered based on the "first in, first out" rule.
9. 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.

1. Dispose of deformed, damaged, or leaking batteries directly irrespective of how long they have been stored.
2. 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.
3. 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.
4. 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

1. Before recharging a battery, you need to check its appearance. Recharge the battery if it is qualified or dispose of it if not.
2. 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

(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

indicates a power cable, indicates a signal cable, indicates wireless communication.

Battery Recharging Cable Connection

Use standard cables provided by Huawei to connect the power control module and battery expansion modules. Do not use non-standard cables (such as extension cables and interconnection cables). If B+ or B– battery cables are reversely connected, the device will be damaged.

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

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%.