How Long Will a 280Ah Battery Last?
The 280Ah prismatic LiFePO4 cell has become popular for DIY battery builds. Four cells make a 12V pack with 3,360Wh total capacity. This size bridges the gap between van life and small off-grid home systems.
Capacity
280Ah
Total Energy (12V)
3360Wh
Usable (80% DoD)
2688Wh
Typical Use
Premium van builds
Runtime Calculator
Runtime at 100W
22.8 hours
1.0 days if running continuously
Total Capacity
3360Wh
Usable (80% DoD)
2688Wh
Solar Charging
* Actual runtime varies based on temperature, battery age, and load consistency.
Runtime Examples at 280Ah
| Device | Power Draw | Runtime |
|---|---|---|
| Fridge | 50W | 45 hours |
| Laptop + lights | 100W | 22 hours |
| Power tools | 300W | 7.5 hours |
| Microwave | 500W | 4.5 hours |
| Small AC/Heater | 1000W | 2.2 hours |
* Based on 12V LiFePO4 with 80% depth of discharge and 85% inverter efficiency.
- ✓DIY battery builders
- ✓Premium van conversions
- ✓Medium off-grid systems
- ✓Backup power enthusiasts
- ✗Those wanting plug-and-play
- ✗First-time battery users
- ✗Warranty-dependent applications
280Ah Battery Tips
- •Popular cell size for DIY battery builds using EVE or CATL cells
- •Four 280Ah cells in series = 12V 280Ah battery
- •Often cheaper than pre-built batteries when DIY
- •Requires BMS, cell compression, and proper assembly
- •Great capacity for running occasional high-power loads
Frequently Asked Questions
Why is 280Ah so popular for DIY?
The 280Ah prismatic cell (EVE, CATL brands) offers excellent value per Wh. Four cells in series make 12.8V nominal. They are easy to source and well-documented for DIY builds.
How many 280Ah cells for 48V?
Sixteen 280Ah cells in series make a 48V 280Ah pack (14.3kWh). This is a common DIY solar powerwall configuration.
Can I mix 280Ah cells from different batches?
Not recommended. Always use cells from the same batch and manufacturer. Mismatched internal resistance causes uneven charging/discharging and reduces pack life.