You can do it.
just a warning(if you don’t already know.). Caps don’t quite add up like batteries do. Nor do they discharge the same way…
For example the 6 350 farad caps the guy is using in series to get to 16.2v, but the capacitance actually drops to 58 farads because they are hooked up in series. This has a good explanation:
https://learn.sparkfun.com/tutorials/series-and-parallel-circuits/series-and-parallel-capacitors
On the bright side, they will smooth the current in the circuit quite admirably eating up output fluctuations from the alternator maybe due to engine speed, sort of like an electronic flywheel.
The even brighter side is the price of full sine, and even grid tie inverters in the low-end 1kw range dropped considerably from amazon.I hadn’t noticed..