Nowhere near enough info.
Guessing it is golf cart batteries set up for 48V,
and something like an Etek, or big brushed PM motor.
It will not work enough to do any good.
Could get a bit of trickle charging from the proposed system, but that's about it.
It will require some fancier circuitry to protect the 12V battery from excessive discharge, or the 12V battery will be ruined in short order.
"Will the inverter even have enough power to make charger work?"
For all we know, it is a 50A forklift charger plugged into a 60W pocket inverter.
At the minimum, it needs 4 exactly matching 12V panels (get 3 more of the same one you have) and a decent 48V controller like the MorningStar TriStar TS-45.
Doing it half way will result in first ruining the 12V battery and 48V bank,
then buying the right solar equipment, and new batteries.
I would suggest considering a second smaller system in 12V. A pair of 6V golf cart batteries, a 50~75W class panel, and controller?
It would be handy for the lights, stereo, sonar, Ship to Shore, GPS...
G-