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Thread: Victron Solar Charge Controller and Battery Monitor Question

  1. #11
    Full Member is offline Full Member
    Name: Sir Colin
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    Autosleeper Palermo


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    Quote Originally Posted by Admin View Post
    I would suggest that you discharge the batteries by about 40% and then see what the charging characteristics are.
    Thanks for the advice, Phil. Much appreciated.

    Colin 😊😊😊

  2. #12
    Full Member is offline Full Member
    Name: Sir Colin
    Spouse: No Thank You

    Member Number
    41323
    Join Date
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    Posts
    264
    Location
    Equidistant From The M25, M1 and A1M
    Motorhome
    Autosleeper Palermo
    Quote Originally Posted by wildebus View Post
    As it happens, I did a few hours driving yesterday for the first time since installing my Split-Charge Relay and looked at the data last time to see what was what on what is now a very similar setup to yours today ....
    I started off the drive with all batteries fully charged (as said by harrow, results will vary depending on current charge levels) and I got very similar results to you - I was 'using' -10 to -15W. So around 0.7-1.2A going into the batteries (which MUST be from the Alterntor via Split Charge the way the data is logged); the MPPT controller was in float mode and providing close to zero Amps in - but it did suddenly kick in with 126W of power when the fridge started - so it seems the Solar Controller is much more responsive then the Alternator to a sudden demand (YMMV on that one on a different vehicle of course).

    So I would say your system is spot on but .... I would suggest running down your battery bank to maybe 80% SOC and then running the engine and seeing what the numbers are in that case as well (ideally go for a drive with someone else driving so you can check the numbers voa bluetooth when engine running in normal circumstances).
    Thanks, wildebus. That's very reassuring information.

    Colin 😊😊😊

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