- 12V models: 14.4 ± 0.2V CC/CV. 24V models: 28.8V per the model manual.
- Recommended charge current is roughly capacity ÷ 5 hours: 20A for 100Ah, 63A for 314Ah.
- Do not use lead-acid equalisation or desulphation modes.
- Charging stops at 0 ± 5°C; warm the pack before charging in freezing conditions.
1. The charge profile
| Model | Charge voltage | Recommended current | Maximum continuous charge |
|---|---|---|---|
| 12V 100Ah | 14.4 ± 0.2V | 20A | 100A |
| 12V 314Ah | 14.4 ± 0.2V | ≈63A | See model manual |
| 24V 100Ah | 28.8V | 20A | See model manual |
| 24V 200Ah | 28.8V | 40A | See model manual |
CC/CV means the charger holds the current limit until the pack reaches the target voltage, then holds the voltage while current tapers. A charger that keeps pushing 14.6–14.8V after full charge is not doing the pack a favour.
2. AC charger, DC-DC and solar
- AC charger: use a LiFePO4 mode, set to the model’s charge voltage. Avoid “lithium” chargers that sit at 14.6–14.8V without a proper profile.
- Alternator: use a LiFePO4-compatible DC-DC charger. A smart alternator’s voltage varies and a plain relay does not protect the pack.
- Solar: use an MPPT controller with a lithium profile. Size the array for the daily load plus losses, and leave headroom for cold-weather Voc rise.
3. How much current?
A practical rule is capacity ÷ 5 hours: 20A for 100Ah, about 63A for 314Ah, 40A for 24V 200Ah. Faster charging is possible within the model’s maximum, but heat and charger capability become the limit.
For a 314Ah pack, a 20A charger is fine but slow: from 20% to 100% is about 12.6 hours. Plan the charge source around the turnaround time you actually need, not just the battery’s maximum.
4. Charging below 0°C
Charging stops at 0 ± 5°C and resumes at 10 ± 5°C. These models do not have self-heating. If the battery is below freezing, warm the space or the pack first; do not override the BMS.
5. Storage and wake-up
For storage, leave the pack at about 50–60% state of charge in a dry place between 0 and 25°C, and top it up every 3–6 months. If the BMS has disconnected on low voltage, remove the load and recharge with a compatible charger; if it stays at 0V, contact support.