Originally Posted by mtaylor42
Anyone ever added an inverter or is this just an instant battery killer?
Depends on the load. For small AC loads and an inverter, you probably want bigger than standard battery capacity, and a generator or solar rig to recharge the battery daily.
A 120 watt appliance draws 1 amp at 120 volts. To power the same device off your 12 volt battery requires 10 amps (before any inverter losses). A 10 amp draw will deplete your battery in about 4 hours (typical battery). A televison or laptop computer can work in this scenario.
An efficient CPAP is possible with an expanded battery capacity, but the good ones run directly off 12 volts, and you avoid the conversion losses by doing so.
Now run a microwave (1000 watts) or hair dryer (1200 watts), and you will blow the DC fuses (or melt the wiring if you don't have fuses), assuming you had an inverter big enough to handle 100 amps input.