Charging LiFePO4 with a modified sine wave inverter?

[wheel3dhom3guy]

I just upgraded my RV solar setup and I'm looking for insights. I've got a new 12V LiFePO4 bank with an extra 100Ah battery and another 100W panel. The old lead-acid batteries were fine, but I'd sometimes have to top them off with shore power or even run jumper cables from my truck's alternator to get them full. That truck charging was a great backup for when I'm in remote areas.

Now with the LiFePO4, I've got a new smart charger that works with AC, but I'm trying to figure out a way to get that truck charging option back without buying a new DC-to-DC charger. I've got an old 1500W modified sine wave inverter in the garage and was thinking about putting it in the truck. Then I could just plug my LiFePO4 charger into the inverter and run the truck for a bit. It seems like a free solution since I already have the gear, and I don't care about the inefficiency for the one or two times a year I might need it.

My main question is, will my LiFePO4 charger even work with that old modified sine wave inverter? And on a side note, is it safe to plug things like my laptop or Apple chargers into a modified sine wave inverter? I want to be sure I won't fry anything! Looking forward to getting advice! Thanks!

 

[Coops]

I'd be cautious using a modified sine wave inverter, some LiFePO4 chargers and electronics don't play nice with them. It might work, but it could overheat or fail. But for your laptop and Apple chargers, pure sine wave is much safer long-term

 

[Serina]

Using a modified sine wave inverter for your LiFePO4 charger is sketchy at best, it might work, but you're risking damage to the charger. Same goes for sensitive electronics like laptops and Apple gear; modified sine isn't clean enough.

If reliability matters, especially off-grid, skip the hacks and get a proper DC-to-DC charger.