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Old 01-15-2011, 10:48 PM   #11
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I guess to make it easier. If my furnance draws 7 amps how long would a 225 AH battery last?
If the furnace is your only draw, divide 7 into 225 and that is how many hours it will last. 32 hours and change...

Of course the furnace does not run 24/7 and there are other draws on the system.
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Old 01-15-2011, 10:57 PM   #12
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About 32 hours, if there is nothing else drawing current.
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Old 01-15-2011, 11:42 PM   #13
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Actually only about 16 hours. Taking in account that you should not discharge a battery beyond 50%. So that 225 amp hour battery is really only good for about 112 amps.
Now in the real world a single 12VDC gp27 deep cycle battery will be dead in one night of cool/cold weather.
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Old 01-16-2011, 07:51 AM   #14
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That is true and totally correct in all respects.

However, the question seemed to indicate "operation until flameout" and was answered that way.
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Old 01-16-2011, 12:10 PM   #15
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Was not disagreeing with you. I was merely trying to state the real world facts. As any more than that will kill a battery.
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Old 01-16-2011, 12:13 PM   #16
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Thank you both for your responses its helpful to know what I should run it to and what I can run it too.
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Old 11-03-2013, 12:27 PM   #17
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Radio shack sells a clamp on amp probe, if I remember it only cost me about $10 or $15 awhile back. Now on the total amperage load on a ckt breaker, back in my communication center installation days a standard ckt breaker is good for a 50% overload.

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Old 08-16-2015, 12:03 AM   #18
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All devices have a data plate:
Either watts or amps are specified.
To calculate:
Watts/ Volts= Amps
or Amps * Volts = Watts


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Old 01-23-2016, 06:06 PM   #19
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I run the stock Rockwood / Furion TV and the sound system on a 200 WT converter.
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Old 01-23-2016, 07:59 PM   #20
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I run the stock Rockwood / Furion TV and the sound system on a 200 WT converter.
You mean INverter, right?
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