| [GMCnet] How long with my house battery run the air conditioner fan? [message #245800] |
Sun, 30 March 2014 18:39 |
glwgmc
Messages: 1014
Registered: June 2004
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Hi Kerry,
I see a number of responses but the way you posed the question suggests a bit of a misunderstanding I think. A good quality 12vdc lead acid battery like you have for starting will hold about 90 amp hours of capacity, not anything near 850ah. You may be looking at the cold cranking amps which could be up around 850 but that is a measure of instantaneous output, not capacity. The amp hour rating is usually measured at a continuous 20 amp per hour rate of discharge, so a 90 amp hour battery at a 20 amp/hour draw theoretically will last 90/20=4.5 hours. But, such a full discharge would destroy the battery very quickly. More reasonable is to draw a lead acid battery down only to around 50% before recharging so in this example you would only have about 45 usable amp hours of capacity which at a 20 amp/hour rate of discharge would last only 2.25 hours. Your dash air fan, which is what I think you are asking about, will draw somewhere in the neighborhood of 6 to 9 amps each hou
r. If your starting battery has 90 amp hours of capacity it would likely last the night if the fan was the only draw, but likely would not have enough left to reliably start the car in the morning. Hope this helps.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed and hand crafted in the 1907 former Masonic Temple building in historic Kerby, OR
Visitors always welcome!
glwork@mac.com
http://jerrywork.com
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Message: 1
Date: Sun, 30 Mar 2014 11:37:05 -0500
From: Kerry Pinkerton <Pinkertonk@MCHSI.com>
Subject: [GMCnet] How long with my house battery run the air
conditioner fan?
To: gmclist@temp.gmcnet.org
Message-ID: <3c00a.53384830@gmc.mybirdfeeder.net>
Content-Type: text/plain; charset="ISO-8859-15"
On the way back from Montgomery, we stayed in a couple sub standard campgrounds. The alternative would have been to stay at a WalMart etc and just run the air conditioner fan to circulate the air and provide white noise. We aren't interested in trying to sleep with the generator running. Given the weather, we needed no heat.
So the question is, if we turned off our 12V fridge over night, how long can we expect a strong 12V house battery to run various 'things'. Does the amp hour rating on the battery mean it will run a total of X amps for one hour? For instance, will an 850AH battery, fully charged, run 850amps for 1 hour, 425A for 2 hours, 212A for 4 hours, etc?
--
Kerry Pinkerton
North Alabama, near Huntsville,
77 Eleganza II, "The Lady", 403CI, also a 76 Eleganza being re-bodied as an Art Deco car hauler
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Jerry & Sharon Work
78 Royale
Kerby, OR
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