Quote:
Originally Posted by solissydney
Received my new UP-45 AH deep cycle battery today,......
The battery is (labeled as 40ah 10hr) What does that mean? 4 amps an hour over 10 hours???
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A battery rated at 40a hrs. for 10 hours means that if you divide 40 into 10 the battery can be discharged at 4 amperes continuously for 10 hours.
So if you use the battery for
5 hours @ 4amps it will be 50% discharged 
Likewise, if the rating was at 5 hours (average night) then divide 5 into 40. This would mean that the battery could discharge 8 amperes continuously for 5 hours.
So if you use the battery for
2. 5 hours @ 8amps it will be 50% discharged
IMO 40ah is very limited and the discharge is too great.
A 100ah /20 hrs should have been your minimum ( So if you use the battery for
10 hours @ 10amps it will be 50% discharged