True, though good quality high capacity batteries are likely out of reach for most, and getting them shipped to the Philippines might be a challenge (In my experience things can get shipped and arrive from the US to PH in a couple weeks at most, then they get lost in the abyss for months, in my experience they always arrive, if not months later.)

Also, I do wonder if running on 220V makes the AC side more challenging/expensive, of course if you can run most things off DC this point is moot.