Converter function

Boomerb77
Boomerb77 Member Posts: 17
in Battery/Electrical & Solar
I’m connected to shore power, but battery monitor showing negative amp drawing down battery charge as I use lights, fans, etc. do I have a converter issue? I understood converter to take the AC from shore power and convert it To DC for lights, etc.
2021 400 BD / 2020  F-150, 3.5L EcoBoost / NE Ohio
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Comments

  • ScottG
    ScottG Administrator Posts: 5,655
    What are you using for a battery monitor? Does the voltage come back up after you remove the load (lights, fan, etc.)? 
    2015 T@B Max S (320)
    2015 Nissan Frontier SV V6 4x4
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  • Marceline
    Marceline Member Posts: 1,748
    Boomerb77 said:
    I’m connected to shore power, but battery monitor showing negative amp drawing down battery charge as I use lights, fans, etc. do I have a converter issue? I understood converter to take the AC from shore power and convert it To DC for lights, etc.
    Are you actually getting AC power at the trailer? Are the 110v power outlets and air conditioning working?
    San Francisco Bay Area
    2013 CS-S us@gi
    2015 Toyota Tacoma PreRunner Double Cab
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  • RFraer
    RFraer Member Posts: 92

    The output voltage on my WFCO8955 is 13.2 VDC “float”, 13.6 VDC “absorption”, and 14.4 VDC “bulk” . If your batteries are fully charged I would check the float voltage at the converter. Form what I have learned is that converters go bad when the transformer shorts out, so they either work or don’t.

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  • pthomas745
    pthomas745 Administrator, Moderator Posts: 4,542
    If you are running things in the trailer, and trying to take a battery voltage measurement, it will always (no matter how pricy the monitor) read low. 
    What monitor are  you using? 
    2017 Outback
    Towed by 2014 Touareg TDi
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  • Boomerb77
    Boomerb77 Member Posts: 17
    BMV 712 smart monitor. Yes, I have AC power. 
    2021 400 BD / 2020  F-150, 3.5L EcoBoost / NE Ohio
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  • Denny16
    Denny16 Member Posts: 5,431
    edited July 2022
    The battery powers the DC circuits and the WFCO Converter charges the battery back up.  The 712 monitor show power loads as a negative amp draw.  If you just want the WFCO to power the DC circuits, then turn of the battery switch.  That said, the converter does not Power the Inverter, it is connected directly to the battery.  
    Cheers 
    2018 TaB400 Custom Boondock,  Jeep Gladiator truck, Northern California Coast.
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  • Mooree
    Mooree Member Posts: 21
    edited July 2022
    MBA power converter was a great option for changing out my old WFCO converter. Very easy install, it delivers 55 amperes topping at 800 watts. It is sufficient for operating different RV devices and fixtures. Lights, auxiliary fans, and other 12-volt appliances will never cease functioning optimally because of this converter.

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