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MPPT + DC-DC = (cheap) B2B

Solar DC-DC B2B Hack Battery Charger

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#11 rando


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Posted 04 October 2019 - 08:23 PM

I honestly can't say why you are only getting 2-5A into the battery - which MPPT charger do you have and are you sure the settings are correct?  


You do not need to ground the output of the DC-DC converter to the frame - it should just go into the solar panel terminals on the charge controller.   Do you also have a solar panel hooked up to the input to the input?

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2016 Fleet Flatbed

2016 Toyota Tacoma

#12 wiredinoc



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Posted 04 October 2019 - 10:09 PM

OK that's how I'm hooked up. What did you mean by a common ground then?


I do have a solar panel but its the suitcase type. I only unpack it when parked and disconnected from the vehicle.


I haven't made any changes to the MPPT, solar works fine. I'm wondering if the 48v is too high. I just ordered that 24v 20 amp model you posted to give it a shot.


Victron 100/20 mppt

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