Need a little help
I got a 28v gen, Want to hook it to my 12v Victron system to charge the batteries, should I used a 24 to 12v converter or something like a mttp ( I know it have to be able hold the amps its 71amp.) Just not sure what the right way to do this.
Thanks
Roy
You can do it. It’s not cheap, not really documented anywhere, and you won’t get a huge charge rate, but it does work.
What you can do is use an isolated DC-DC converter like the Orion-Tr 24/48-8.5 (400 W), then feed its 48 V output into an MPPT.
There’s also a product called the BLUETTI Charger 1, which is a universal MPPT power supply. It takes up to 28 V input and outputs up to 56 V, which you can also feed into an MPPT.
I’ve set up both of these before. I used to have a 36 V battery on my boat and ran a 12 V-to-48 V converter into a 100/20 MPPT. I also helped a mate install the BLUETTI Charger 1 in his Ford Ranger. They’re tidy installs because you only need small cables from the converter to the MPPT, instead of running heavy, full-current cables to a charger.
Just make sure to check whether the BLUETTI Charger 1’s 28 V input limit is strict, and confirm that your power supply won’t exceed it.
Keep in mind that Victron DC-DC chargers are designed for charging a secondary battery from a main battery that’s connected to a charging source.
If you post the specs and setup of your power supply, we can check if it’s going to work.
Far better to use a 24/12V dc/dc charger that you can control the output voltage.
MPPT’s should NOT be used for anything but solar charging.