have an interesting power question for you electric gurus

[RunnerUp]

alright, my neighbor has a commercial grade cooler, a delfield 4448N-18M in his trailer. is it possible to power it off of DC power up to 10 hours with a large enough inverter and multple batteries? and if so, how? if not, any other ideas besides a gas powered generator if the trailer has to be stand alone?

thanks in advance, i am just so not good with electrical issues

[RunnerUp]

the draw is 8.11kwh daily

[CJM]

I would honestly say that you need a generator.

You would probably need at least a 3000w inverter and like 6 large capacity marine batteries to run it for that long.

[mastacox]

8.11 kWh per day (24 hours) equals out to 337W of power draw, well within the capabilities of a reasonably small inverter (say perhaps a 450W inverter).

Still, that works out to about 28.1 amps of draw at 12 volts, meaning you would need 674.4 amp-hours of battery storage to run it for 24 hours, or about 6-8 large deep-cycle batteries. Given the price of batteries of that size, you might be better off looking at a generator in the 1kW area, since they are pretty cheap.

[4x4mike]

You're going to need a generator. The start up on the compressor has a lot of amp pull. An inverter isn't very efficient and I'm not sure how it will act with the thing cycling on and off over 24 hours.

[MTL_4runner]

the draw is 8.11kwh daily


Seems like it may be a bit low for the oveall power requirements since the motor appears to be a 1/5 HP drawing 7.2 amps at standard AC voltage under maximum load. So I calculate you need to have a capacity of 115v x 7.2a = 828 Watts to operate the unit at startup. The power requirements may go down to the 8.11kw per day once the interior has reached a static temp.

Here's the spec sheet for those that are interested:
http://www.delfield.com/docs/uploaded/del/specsheets/DS4448N-M.pdf


Aside from setting up a portable wind turbine, you're not likely to be able to bring enough batteries to power that machine for long.
A generator is unfortunately likely to be your best bet.