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Camper_Jeff___K's avatar
Camper_Jeff___K
Navigator
Feb 27, 2026

Upgrading from a 30 amp to a 50 amp DC DC Charger

VIDEO: Upgrading To A 50 AMP DC DC Charger

I'm Upgrading my VICTRON 30 AMP DC DC Charger to a VICTRON 50 AMP DC DC Charger. More power is delivered and it operates much cooler. I like to run the fridge on the 800 watt solar system during the day, and on the DC DC Charger when Driving at nearly 700 watts. We can see a total of 1500 watts charging the 2 200AH LIFEPO batteries. It is important to get a larger Alternator when you upgrade to Lithium Batteries to use a DC DC Charger. Notice in the video, I show a burntout 6awg cable that was too small to go from a 30 amp charger to a 50 amp dc dc charger. the nice lady has since had the 6 awg wire replaced with 4awg wire and the 50 amp charger is working properly now.

2 Replies

  • StirCrazy's avatar
    StirCrazy
    Moderator
    Feb 27, 2026

    if you are running the fridge during the day on solar, is the solar still not going to be running the fridge when your driving during the day? I can see going to a bigger dc to dc if your solar isn't keeping up and you need a little more power to charge during that drive, but there is no way topick which one your powering your fridge from unless your turning off the solar panels.  

    • Camper_Jeff___K's avatar
      Camper_Jeff___K
      Navigator
      Feb 27, 2026

      There are these things called cloudy and rainy days. There are also times on the year where solar in the Northern Hemisphere produce very little solar due to low sun angle and shortness of the day. November December January February being the worst 4 out of 12 months for power production. During those months, the DC DC charger is your best friend in the world. Everytime I  take a drive, the truck alternator charges the house batteries. In summer, I can switch off the DC Charger if needed. The solar is at peak performance 3 to 5 hours a day. After that, any assistance is desirable.  The BMS manages the charge of the batteries flawlessly. Too much power has never been an issue. Too little power, that's a problem I've never had. The Victron units both sense the state of charge of the batteries and adjust their outputs accordingly. 

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