QUICK: Divide watts by 10.
- For example, your 240V appliance shows a rating of 300W.
- 300 / 10 = 30A
- This appliance will draw 30A from your 12V batteries when running through an inverter.
- Watts are Watts and remain the same whether running from 240VAC or 12VDC through an inverter.
- Inverter efficiency is approximately 85%
- Watts = Volts x Amps
- So, a 300W appliance, running on 12v:
300W / 12V / 85% = 29.4A