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I completely get that whatever you buy, you want to be able to get a replacement warranty and coverage if needed. I'm just tossing options and ideas. I personally don't know anything about Fuel Zero nut what they are putting together (which are actually pretty cool setup or portable) can be replicated. Yup, that Yiyen site is a manufacturer, they do not retail direct. The AIMS / Yiyen moels like this can / do support basic lithium BUT as they are Dip Switch & rotary pot switch and you cannot adjust the voltages nor tweak them properly. See thumbnails below taken from the AIMS manual. Note it does not even have a Lithium Selector. My Yiyen (which is this but not rebranded) worked like a charm, but output was 120VAC/63Hz (speeds up clocks etc) quite loud / fan and the vibration from it... Took everything I threw at even running table saw & air compressor (it did not appreciate the compressor !) but also, I ONLY ran it with my Lead Bank. Now Aims also has similar but more advanced models with better features, programmability and better handling for Lithium.
The research into inverter sourcing is much appreciated. The rebranded Sigineer that snoobler shows from Electric Car Parts Company looks to be the best bet so far. The $400 to $500 price range is certainly better than $1000 for an electronically identical unit. Whatever one lets me dial in LiFePO4 charging voltages (3.55V?) most effectively is what I'll go with.