The rating on the caps is as follows...
Maximum rated voltage, yours = 50v.
You can hook them upto a 50 volt DC source & they shouldn't pop.

The capacity is rated in Farid, or in your case "microfarids" 2200uf.
It is how much they will hold.
I regularly hook 9400uf to my receiver for stability, but they are only rated 10 volts & are only as big as my receiver.

Caps size is equally dependant on voltage rating as much as is capacity.
As big as those are they would be well over 15,000uf at 10 volts.

They only charge upto what ever the supply voltage is. If you feed them 6 volts that is what they charge to, 6 volts...
Feed them with 12v they hold 12v
Feed them 51 volts & they will likely fail.

I don't have any good ideas for what you have, but they are big & low in capacity.
You can hook them to a 50 volt source, but I don't know of too many of those.