"JAXAshby" wrote in message
...
That is the way battery ratings work.)

I know. Such a small battery is not suitable for any forced air heating
system.

doug, a brand new, fully-charged Grp 27 battery will give up about 50 to
60
amps before it is dead.

I suspect you mean amp-hours since amps is not a measure of capacity.

Even more when going to flat dead. That Espar ran
that brand new, fully-charged Grp 27 battery flat dead in about 6 hours.
Flat
dead.

50-60AH at the 20 hour rate which is normally how batteries are rated. A 5
or 6
amp draw is much higher than the 20 hr rate. More like a 10 hr rate or
worse.

of course, it was not 68* outside. More like low 40's.

Depends upon what temperature the thermostat is set at, the outside temp,
how well the boats is insulated, etc. Sorry, a Group 27 battery just isn't
suited
for a forced air system. Isn;t really suited for much of a refrigeration
system
either.