Rear area power- 600W peak, 250W average draw

[MileHigh]

I’m a complete electrical idiot. I’m looking to run some gear with the above specs 600W max draw, average 250W. Looking to run for 4 hours, maybe 8? I assume I’d need to run the engine, at least intermittently, or are there batteries that would be able to do this? It’s for a computer type application with a PC PSU if that matters. Want to put it in the back, plugged into a US household plug outlet.

 

[rob88]

Got it. Running a 250W average load for hours needs a big separate battery. A large lithium power station or a custom dual-battery setup with a pure sine wave inverter is the way to go. This isn't a simple plug-and-play job; you should get it professionally installed to be safe.

 

[landmannnn]

I’m a complete electrical idiot. I’m looking to run some gear with the above specs 600W max draw, average 250W. Looking to run for 4 hours, maybe 8? I assume I’d need to run the engine, at least intermittently, or are there batteries that would be able to do this? It’s for a computer type application with a PC PSU if that matters. Want to put it in the back, plugged into a US household plug outlet.

250w constant load will draw 20A per hour from your battery.

The battery is 110A, so in theory it will be flat in 5 hours. On practice you can only use half the capacity, so without the engine running you will have a maximum of 2.5 hours.

Running the engine at idle for several hours is a bad idea, so yes you will need a second battery.

Your best option is a second 200A LiFePO4 battery (you can run these to zero) which will give you 10 hours. Maybe a 300A.

You would need a high capacity DCDC charger to charge the battery in the car, a suitable inverter and of course a load of wire.