Converter Fan coming on after 6 volt battery conversion.

51chevy
51chevy Member Posts: 31
in Battery/Electrical & Solar
I just finished my two 6 volt battery conversion. Everything is working fine but as soon as I hooked up to my house the fan in the converter came on. I’ve never heard it before now. Everything still working fine with battery switch on or off hooked to shore power. Anyone know why the fan would immediately come on and stay on? Thanks
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  • Bayliss
    Bayliss Member Posts: 1,496
    @51chevy, I'm just going to throw out a guess for why, since I do not have a specific answer.  Depending on the state of charge of your batteries (seems like they would be fully charged, since presumably new), maybe the converter is initially sending more power (i.e., bulk charging) to the batteries to get them to somewhere around 14.4 - 14.6 volts.  After that, it should drop to absorb mode and ultimately maintenance mode (where the battery will neither charge, nor discharge.)  If so, that may cause the fan to start immediately to cool the converter as it starts that process.  Again, just a guess.
    2019 T@B 320 S Boondock Lite; 2025 Toyota Tundra CrewMax 4x4
    (Alde: 3020; Refrig: Isotherm Cruise 65 Eleg; Battery: BB 100Ah LiFePO4; Solar: Renogy 220W Portable Suitcase w/ Victron SmartSolar MPPT 75/15 Controller; Victron BMV-712 Battery Monitor w/ Shunt; Pwr Cntr: PD-4135KW2B; EMS: PI-HW30C)
    Greg & Marlene (Tucson, AZ)


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  • Sharon_is_SAM
    Sharon_is_SAM Member Posts: 10,061
    I agree with Bayliss.  
    Sharon / 2017 T@B CSS / 2015 Toyota Sienna Minivan / Westlake, Ohio
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  • ColoradoJon
    ColoradoJon Member Posts: 415
    My converter does the exact same thing with my 6V batteries.  I charge using an external charger as it works much better than the WFCO converter and without the noisy fan.
    Jon & Angela | Florissant Colorado | 2017 Outback S
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  • db_cooper
    db_cooper Member Posts: 748
    This^

    Converter fan briefly comes on whenever I turn the battery switch on while hooked to shore power, even with dual 6v fully charged.
    2015 Max S Outback | 2010 Xterra  -- Retired
    2022 Ford F350 Tremor |  2022 Cirrus 620



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  • 51chevy
    51chevy Member Posts: 31
    Ok, Thanks Guys
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  • davel4wa
    davel4wa Member Posts: 91
    I believe there is an amber LED in the converter that lights when in 'bull's charging mode. You could check if it is on and if it stays on.
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