I have a solar setup for some computing equipment that is working pretty well for me (most of the time), however it doesn't have quite enough juice to make it through the night on very overcast winter days.
While I could throw more panels and batteries at the problem it would not be economical as I would not be able to utilise that energy >90% of the time.
I have a large unused UPS transformer from a UPS that used to power this equipment and I was wondering if there is anything preventing the possibility of stepping down the 240V AC wall power to around 40V-60V DC using it, and then feeding the charger controller from this. I would of course connect this in such a way that it cannot operate at the same time as the solar input or back feed into it.
I was also wondering then if a rectification step would still be required for the DC conversion, or would the charge controller be able to handle that step? I would think a charge controller anyway rectifies so probably it is unnecessary but perhaps I am missing something?