Explainer
12 V, 24 V or 48 V: choosing system voltage
Why bigger systems move to higher voltage.
Published
Key points
- Higher voltage means lower current for the same power.
- Lower current allows thinner wire and less loss.
- 12 V suits vans and small setups; 48 V is common for cabins and homes.
Current and wire
Power = volts × amps. A 2,400 W inverter draws about 200 A at 12 V but about 50 A at 48 V. Lower current means smaller cables, smaller fuses and less voltage drop.
Common rules of thumb
| System size | Common voltage |
|---|---|
| Under about 1,500 W of inverter | 12 V |
| About 1,500–3,000 W | 24 V |
| Above about 3,000 W | 48 V |
These are general guidelines; follow equipment manufacturers' recommendations.
Vehicles and RVs
Vehicles run on 12 V, so many van and RV systems stay at 12 V for direct DC loads, sometimes with a DC-DC converter from a higher-voltage battery.
FAQ
Where do I go next?
Try the power planner to put numbers to your own situation, or see the product picks on the deals page.
Terms used here
- Watt (W)
- Rate of power use or production.
- Inverter
- Converts DC battery power to AC household power.
This guide is informational and based on published specifications and general references, not hands-on testing. Check the manufacturer's current specs before you buy.