It typically runs about 500ma, about 12.8 volts depending on battery (lead acid ) status.

In flight it definitely not and issue, demand is about 750ma.
However on the ground between flights is the concern where there is no demand. That is the big advantage of the solar panel, as it can top off the battery for the next flight, I rarely have to remove the battery.

I only run the panel on the ground when flying almost daily, otherwise the airplane is in a trailer.
I don't run any controller with the lead acid batteries as it takes a couple days of not flying to get the voltage up over about 14 volts.

Brian