Bertram31.com General Bulletin Board

Re: 12 volt inverters?

Posted By: bruce
Date: Saturday, 9 July 2005, at 12:49 p.m.

In Response To: Re: 12 volt inverters? (bruce)

To follow up with formulas:

Amp Hours

The Amp Hour rating tells you how much amperage is available when discharged evenly over a 20 hour period. The amp hour rating is cumulative, so in order to know how many constant amps the battery will output for 20 hours, you have to divide the amp hour rating by 20.

Example: If a battery has an amp hour rating of 75, dividing by 20 = 3.75.
Such a battery can carry a 3.75 amp load for 20 hours before dropping to 10.5 volts.
(10.5 volts is the fully discharged level, at which point the battery needs to be recharged.) A battery with an amp hour rating of 55 will carry a 2.75 amp load for 20 hours before dropping to 10.5 volts.

Reserve Minutes

Reserve minutes is the number of minutes a battery will carry a 25 amp load before dropping to 10.5 volts. (10.5 volts is the fully discharged level, at which point the battery needs to be recharged.)

Messages In This Thread

12 volt inverters
Terry -- Thursday, 7 July 2005, at 11:41 a.m.

Re: 12 volt inverters
Carl -- Thursday, 7 July 2005, at 1:20 p.m.

Re: 12 volt inverters
bruce -- Thursday, 7 July 2005, at 1:33 p.m.

Re: 12 volt inverters?
Carl -- Friday, 8 July 2005, at 7:54 a.m.

Re: 12 volt inverters?
Capt. Dave Kosh -- Friday, 8 July 2005, at 11:04 a.m.

Re: 12 volt inverters?
bruce -- Saturday, 9 July 2005, at 7:48 a.m.

Re: 12 volt inverters?
bruce -- Saturday, 9 July 2005, at 12:49 p.m.