Campervan Power Setup – Using 64V LiFePO4 Batteries (Without Turning My Van Into a Bonfire)

[BaconMaker]

Hi everyone, I’m new here—apologies if this is in the wrong section. Admin, feel free to slap my wrist if needed!

I’m setting up a solar-powered system for my campervan and want to use some leftover 64V (20s) LiFePO4 modules from an abandoned EV project. Rather than breaking them down to 48V (because, let’s be real, I have better things to do), I’d like to use them as they are. I’ll only run four modules at a time and swap them in/out as needed. And yes, I’ll balance them before connecting them in parallel, won't do that mistake again.


The Setup


• Charging: Solar panels + alternator.

• 12V Loads: Minimal—just some lights and a 50W water pump.

• 230V Loads: Mostly induction cooking (gas is so last century).

• Inverter: EcoFlow Delta Max 2000, powered via the XT60 port (handles up to 100V).



The Plan (a.k.a. Possible Bonfire Material?)

Most MPPTs don’t handle 64V directly, so I’m considering:


1. MPPT → 4s LiFePO4 buffer battery (since MPPTs love 12–48V).


2. Boost converter → 72V (full charge for my 20s packs).


3. Hope for the best.





I’ve heard some Victron gear might support up to 70V, but I haven’t found any official confirmation. Anyone have experience with this?





I’ve also seen MPPTs that claim to handle 72V, but they seem suspiciously cheap. Are they any good, or just a shortcut to electrical disaster?





Battery Specs


• 35kg each

• 250A max output per module (yes, overkill).

• Robust screw terminals & active balancing.

• No BMS yet, but that’s on the wishlist.





The Big Questions


• Any MPPT that can actually handle 64V or 72V safely? That's not ridiculously expensive

• Good boost converter recommendations that won’t waste half my solar energy as heat?

• BMS suggestions for a solar setup? Like i have used a few Daly 300A bmses before, But not for solar and i don't feel forgoing the orion route





I appreciate any input, experiences, or cautionary tales—just trying to power my van without turning it into a rolling bonfire.





Thanks in advance!

 

[chrisski]

I’ve heard some Victron gear might support up to 70V, but I haven’t found any official confirmation. Anyone have experience with this?

If you’ve looked at the spec sheets and it’s not there probably not true.

Another way to do this is download the Victron app and practice changing voltages to see if it will fit.

1. MPPT → 4s LiFePO4 buffer battery (since MPPTs love 12–48V).


2. Boost converter → 72V (full charge for my 20s packs).


3. Hope for the best

this seems like a bad idea.

An Outback FM 100 will charge to 68 volts. This is a reputable controller. Is this close enough?

 

[BaconMaker]

If you’ve looked at the spec sheets and it’s not there probably not true.

Another way to do this is download the Victron app and practice changing voltages to see if it will fit.

this seems like a bad idea.

An Outback FM 100 will charge to 68 volts. This is a reputable controller. Is this close enough?

It definitely sounds like a bad idea,



I will look into that one, 68 could work I will only lose 10-15 percentage of the capacity