Dc-Ac-Dc charging in vehicle

So ive mentioned it a couple of times but finally snapped a couple of relevant pics during an experiment and decided that was a good enough reason to post.

I have experimented with rectifying 120v and 240v ac and feeding that to (450voc max) mppts and had no issues doing so as of yet. Because I have two inverters in my RV, this allows me to do alternator charging by having one inverter hooked to starter battery system, feeding through a rectifier/filter, into the other inverter’s mppt to charge the lithium bank.





Pics show the simple rectifier module which is rated 10a, rectifying 8.7a of 120vac from MSW inverter, feeding it as 130vdc (loaded) to mppt of the orange all in one inverter, which is charging my lifepo4 at ~14.6v and ~60amps.


I have actually since bought a 60a dc-dc charger ($71 on amazon with coupon) but i just wanted to point out that this was a feasible way of doing things if one had two inverters, or to use as ‘shore power’ to charge lithium onboard while still doing double conversion, vs just doing ‘ac passthrough’. If anyone cared.

Cool thinking. But if the 1 inverter is pumping out AC then why not just feed that into the input of inverter2?

This is how I do it with multiple inverters on shore. I have Victron Quattros with dual inputs but you can easily get an auto transfer switch so it'll work.

In my case one inverter is 120v while the other is 220v. In truth the main reason i bought the orange all in one is because of its 450v mppt and 80a battery charger. I never really had plans to use its 220v inverter output. Feeding it rectified 120vac allows me to power it from the other inverter without any concern for the quality of the waveform or other such 'pickiness' inverters have for accepting AC input.

where did you get that rec/filter setup. been considering a similar setup for generator charging