How Long Will a 200Ah Battery Last?
A 200Ah battery bank is the standard for serious van lifers and small off-grid setups. With 2,400Wh total capacity (1,920Wh usable), it can handle refrigeration, multiple devices, and occasional high-power tools.
Capacity
200Ah
Total Energy (12V)
2400Wh
Usable (80% DoD)
1920Wh
Typical Use
Full-time van life
Runtime Calculator
Runtime at 100W
16.3 hours
0.7 days if running continuously
Total Capacity
2400Wh
Usable (80% DoD)
1920Wh
Solar Charging
* Actual runtime varies based on temperature, battery age, and load consistency.
Runtime Examples at 200Ah
| Device | Power Draw | Runtime |
|---|---|---|
| CPAP | 30W | 54 hours |
| 12V fridge | 50W | 32 hours |
| Laptop + lights | 100W | 16 hours |
| Power tools | 300W | 5.3 hours |
| Microwave | 500W | 3.2 hours |
* Based on 12V LiFePO4 with 80% depth of discharge and 85% inverter efficiency.
- ✓Full-time van life
- ✓Extended RV trips
- ✓Small off-grid cabin
- ✓Marine liveaboard
- ✓Serious emergency backup
- ✗Off-grid house
- ✗Running AC regularly
- ✗High-power workshop
- ✗Areas with limited sun
200Ah Battery Tips
- •Standard minimum for full-time van life or RV living
- •Can handle a 24/7 fridge plus daily device charging
- •Pair with 400W+ solar for sustainable off-grid power
- •Can run a small inverter load (500W) for several hours
- •Two 100Ah batteries in parallel is often cheaper than one 200Ah
Frequently Asked Questions
How many days will 200Ah last without solar?
With typical van life usage (fridge + devices), about 2-3 days. Heavy use with inverter loads, maybe 1 day. Light use with just lights and charging, 4-5 days.
How much solar for 200Ah battery?
400W of solar panels is ideal - can fully recharge in 5-6 hours of good sun. 200W works but may not fully recharge on shorter winter days or with heavy use.
Is 200Ah enough for off-grid?
For a van or small cabin with efficient appliances, yes. For a house with normal appliances, no - you need 400Ah+ or more likely a 24V/48V system.