That sounds pretty technical. If you think about the very large differences in a basic
MPPT battery charging system/inverter, and a GTI.. They GTI is clearly more complex.
It seems like your best bet is looking around for a swap deal or a trade-in.
Maybe a GTI costs more and you could go off-grid at no extra cost.
I have a cheap Chinese PowerJack 1200w GTI that I would like to use off-grid. (During long power failures).
I will use a fake grid (AC power source) to trick the GTI into thinking it's connected to the real grid.
Plan A is to use my 5kW gas generator to act as the source..
Plan B is to buy a 'pure sinewave' inverter to act as an AC source.
I'm not sure how well this would work, but it's on my list to check out
the PowerJack this fall when I test the 5kW gas gen..
The pure sinewave inverter idea isn't too complex, you just need
a battery pack to power it. The battery could be fed by a PV charger unit
or just a plain old plug-in charger. You could size the battery to provide
a source all day or into the night, running lower AC power..
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