Originally Posted by F and E Damp
If a 120V appliance, such as your CPAP, draws 10 amps on 120V it will draw a little more than 100 Amps on 12 volts. Make sure the wires are plenty big enough and you have a large battery bank that can supply 100 Amps for 8 hours.
Is this right? Your CPAP draws 10 amps at 120 VAC? 1200 watts seems like a lot of power for a CPAP.
The DW's unit is 200 watts (the humidifier unit I added draws another 150 watts) for a total of 350 watts.
200 watts is 17 amps DC and 350 watts is just under 30 amps DC. The CPAP draw is constant but the humidifier's load varies according to the water temperature (whether it is heating or not).
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