| [GMCnet] Interesting electrical/battery issue [message #259663] |
Thu, 21 August 2014 19:49  |
glwgmc
Messages: 1014
Registered: June 2004
Karma:
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Senior Member |
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Thanks, Mac. Yes, the microwave does pull a bit over 1500 watts at full power but is only on for a short time. Sounds like a replacement battery bank may be required, although I really expected these to last longer given that we are not full timing in a GMC. We did full time in the Beaver Patriot for four years and when we sold it the batteries appeared to be just as strong as when we started.
I am seeing an increase in white deposits around the battery bank so that may also be a hint. If I do need to replace them I think I will use AGMs this time. The Lifeline and Full River folks tell me I can safely discharge them to 80% and get about the same life as wet cells discharged to 50%. My current bank of 4 wet cells provides 230 amp hours of effective capacity when new (460 x .5 = 230) and two 240 amp hour AGM 6vdc batteries discharged to 80% would provide 192 effective amp hours at about half the weight and none of the hassle. More expensive, yes, but could be worth it if they last longer than the wet cells.
Matt C. or any of you boater guys, do you have real world experience that would validate the longer life for AGMs at 80% discharge or is that just sales talk on the part of Lifeline and Full River?
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: 3
Date: Thu, 21 Aug 2014 18:04:16 -0500
From: D C _Mac_ Macdonald
Subject: Re: [GMCnet] Interesting electrical/battery issue
To: GMC Mail List
Message-ID:
Content-Type: text/plain; charset="iso-8859-1"
And 12.7 Amps from a 120 V line is 1524 Watts!
Five to six year old batteries will be lucky to put out more than 50-60% of their original rated Amp-Hour ratings.
A competent battery shop can do a check on each of the batteries, but they'll probably have to disconnect to check each one to do that check.
Time to head for Sam's or Costco and get four new batteries!
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Jerry & Sharon Work
78 Royale
Kerby, OR
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