See my reply to oxygenator post. I am doing the same thing basically.
--
RichToyBox
http://www.geocities.com/richtoybox/pondintro.html


"DaBear" wrote in message
news:Cot0b.200156$o%2.92591@sccrnsc02...
A friend in Washington state has a deep cycle marine battery and a power
inverter that plugs in to a cigarette lighter, he bought the whole set up
at
Walmart. The inverter puts out 175 watts at 115 volts. He paid $34.99 for
the inverter, I have no idea what he paid for the battery. If the power
goes
out he can run his pond for some time.
He is planning on getting a few more batteries, but I thought it was an
excellent idea and plan on setting up something along the same lines
here......

Bear