- Usable energy at 80% DOD: 1.0 / 3.2 / 2.0 / 4.1 kWh for 12V 100 / 12V 314 / 24V 100 / 24V 200.
- The 12V 314Ah has a 200A BMS; the other three are rated 100A continuous.
- 24V halves the current at the same power, but 24V packs cannot be put in series.
- Weight and bay size often decide before the electrical math does.
1. The four models, side by side
| Model | Nominal energy | Usable @80% DOD | Max cont. discharge | Weight | Bank limit |
|---|---|---|---|---|---|
| 12V 100Ah | 1,280 Wh | ≈1.0 kWh | 100A | 10.3 kg | 4S4P |
| 12V 314Ah | 4,019 Wh | ≈3.2 kWh | 200A | 26.5 kg | 4S4P |
| 24V 100Ah | 2,560 Wh | ≈2.0 kWh | 100A | 18.7 kg | 1S4P |
| 24V 200Ah | 5,120 Wh | ≈4.1 kWh | 100A | On request | 1S4P |
The 24V 200Ah has more energy than the 12V 314Ah but the same 100A discharge limit. At 25.6V that is about 2,560W continuous; the 12V 314Ah at 200A and 12.8V is also about 2,560W. The difference is the system voltage, not the peak power.
2. What capacity means in runtime
Runtime ≈ usable Wh ÷ average load. These are planning numbers, not guarantees: inverter losses, cold and ageing all reduce them.
| Average load | 12V 100Ah | 12V 314Ah | 24V 100Ah | 24V 200Ah |
|---|---|---|---|---|
| 50W (fridge + lights) | ≈20 h | ≈64 h | ≈41 h | ≈82 h |
| 200W (van base load) | ≈5 h | ≈16 h | ≈10 h | ≈20 h |
| 1,000W inverter | ≈1 h | ≈3.2 h | ≈2 h | ≈4.1 h |
3. A simple decision rule
- Weekend van, 12V fridge and lights, one-day autonomy: 12V 100Ah.
- Full-time van, induction or coffee, 2–4 kWh/day: 12V 314Ah, or a 24V system if you are building from scratch.
- Existing 24V boat or trolling motor: 24V 100Ah for a small motor/day boat; 24V 200Ah for longer sessions or a house bank.
- Home backup, critical loads only: 24V 100Ah for 1 day; 24V 200Ah for 2 days; parallel up to 1S4P.
If the math lands between two models, go up only if the extra weight and space are acceptable. A larger pack that does not fit the bay is worse than a smaller pack plus a second charge source.
4. Series and parallel limits
12V models support up to 4S4P: four in series, four in parallel. 24V models are 1S4P — parallel only. Never series-connect the 24V packs.
Use the same model and similar age. Bring every battery to a similar state of charge before paralleling, and use equal cable lengths so the packs share current evenly.