This is an easy calculation for you.

1) Find the battery bank capacity, in terms of volts, and
ampere-hours.
(To get the feel of it, recall some car batteries are 12 volt, 100
amp-hours)

2) Find the desired load.
As an illustration, take a microwave as 1 kilowatt = 1000 watts.

3) Reduce 1) to compatible units: e.g. 12 X 100 - watt - hour = 1200
watt-hour

4) For 100% conversion efficiency, divide number in 3) by number in 2)
1200 watt-hour/1000 watt = 1.2 hours.

4) Then use a realistic efficiency - from 50% to 90%
1.2 hours X 50% = 0.6 hr = 36 minutes

Brian Whatcott


On Mon, 06 Oct 2003 04:41:29 GMT, "John Tretick"
wrote:

Hello Group,
+
I have a 24" Bayliner Cierra 2001 and I am interested in using AC when not
at port. No place to install a generator, so I'm thinking an invertor with
a batterstore. Possibly increasing my batteries to 3 and wiring in GFI
circiut to power mixers, inflators , hairdriers, etc.. when I'm anchored.
Northern tools sells a sealed Marine invertor for 399 its 3000/1500W which
works for my purposes.. doubt it would run the AC..
but I guess I'd have to get a larger on for that..

Has anyone installed this redundant power source defore? I'm curious how
long you can run on it without depleting one battery..
Actually thinking about installing a third battery for this purpose.

Thaks,

John