Fuzzy wrote:

quick math soloution for you. P= Power in Watts E=Voltage in Volts I=
current in amps

P=ExI Batterys are rated in amp hours, ie how many amps they will supply
per hour. They are also rated in minuets. How many minuets they will
supply the rated current for. Common deep cycling marine batterys would
run an average aquarium set up for a couple days in my opinion. Keep in
mind the invert itself will draw a surplus P and depending upon the type
and size this will affect the total calculation.

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Thanks for the info, and the push. I picked up a 350 watt inverter
over
the week end. And I already had a new 60 amp car battery, sitting
idle.

So, if I am running only my 45 watt main pump, then, 45w / 12v =
3.75 amp.
Then, My Inverter states that it is 90% efficient. So Would I multiply
3.75 times 110%, for 4.1 amps on the battery? If I have a 60 amp/hour
battery,
then 4.1 / 60 = 14.6 hrs. At least it should be more than 10 hours.
Does that sound right?

Paul