Habitation battery discharge...possible explanation?

Discussion in 'Tech/Mech General' started by Steptoe, Jan 9, 2008.

  1. Steptoe

    Steptoe Read Only Funster

    Jan 6, 2008
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    A fairly consistent issue in the tech forums seems to be the problem of habitation batteries losing their charge over a period of time when the van is not in use.

    This has happened twice to my van since autumn so as this hadn’t previously been a problem for the last two winters, I felt I should investigate. Diagnosing with a meter set to check current drain was made a little tricky by one of the leisure batteries having discharged more than the other and the solar panel pumping a little juice in, but eventually I determined that the drain was down to the inverter. This is an aftermarket item which I had wired permanently into the 12v habitation circuit earlier this year, not realising that it draws a certain amount of current whether or not anything is plugged into the 240v side. It wasn’t a problem in the summer as the solar panel output is then much greater than the drain (about .25 amps).

    I don’t know if new vans are supplied with built-in inverters or if these are permanently on, it may be that this problem is unique to me as I have used a unit which is designed to be plugged in and switched on when required.

    The solution, in my case, is simple enough, turn off the inverter when not in use, but I wish now that I hadn’t hidden it under the wardrobe base:Sad:,a strategically positioned hole for finger control will be required
  2. Geo

    Geo Trader - Funster

    Jul 29, 2007
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    Another easier switch to reach elsewhere in the circuit

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