Home » Public Forums » GMCnet » [GMCnet] Converter, charger, inverter stuff
| [GMCnet] Converter, charger, inverter stuff [message #258579] |
Tue, 12 August 2014 10:01 |
glwgmc
Messages: 1014
Registered: June 2004
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Thanks, Mark, very helpful for every one of us chasing mysterious battery bank related issues. Your comments prompted me to check the service dates on the battery bank - 2006. They appear to be fine but I will have the Interstate Battery folks load test them while we are here at FMCA. I checked the water levels before we left on this trip (none low, just normal maintenance water required) but there was a significant amount of white powder residue around the bottom of the batteries which I washed off with baking soda and water. The posts were clean and residue free.
Jerry
Jerry Work
The Dovetail Joint
Fine furniture designed & hand crafted
in the 1907 former Masonic Temple building
in historic Kerby, OR
http://jerrywork.com
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Message: 14
Date: Tue, 12 Aug 2014 08:24:26 -0600
From: Mark
Subject: Re: [GMCnet] Converter, charger, inverter stuff
To: gmclist@temp.gmcnet.org
Message-ID:
Content-Type: text/plain; charset="utf-8"
Jerry, I agree that it's unlikely that 2' of 00 cable is going to cause much of a voltage drop problem.
I'd still seriously recommend checking the DC voltage input at the inverter under full load. If it's not sagging much (say below 12.5 volts) then you
know for a fact you have a bad inverter.
If it IS sagging below that (and the battery voltage is fine while you're taking those measurement, of course), then the easiest method for finding
the problem is to look for a voltage drop from point to point to point. The way I do this is to put the voltmeter on a low scale, and measure from
the battery post to the battery cable clamp. Then from the clamp to the point the battery cable is connected to the next point. And then from that
point to the next reachable point in the circuit, and so on. You'll figure out where the voltage is "going" that way, and if you DO find a drop of
more than 0.1V (unless it's across a really long cable, where that could be normal), you have found the problem. And don't forget this applies
equally to the ground side of the circuit - if you are measuring a significant voltage drop from the inverter's negative terminal to the chassis (or
wherever it's grounded), you have located the problem.
Of course, none of the above means much if your house batteries aren't charged... inverters really don't like running on anything BUT a fully charged
battery. You're going to be drawing at LEAST 120 amps from your batteries under full load (your microwave running on high), so those batteries really
have to be in great shape and fully charged... you can eliminate a lot of troubleshooting if you measure the voltage at the batteries while the
microwave is running... if it's dropping down to 12.0 volts or below, you have your answer and don't have to worry about the wiring.
--
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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Jerry & Sharon Work
78 Royale
Kerby, OR
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