I'm with MEX... and BFL... sorta'. :)
Additionally...
Here's the thing about that supposed low current from the panels; it depends on the setting of the controller. If the batteries are topped, it doesn't take much. If the controller is allowing equalization voltages through (say 14s and above depending on temperature,) you're looking at some Hydrogen under (and over) those caps.
I will pop my caps (carefully) when the bank is hooked to shore and the converter is charging, but we're looking at maybe an Amp at about 13.5V (old 6300 series converter,) so the Hydrogen level should be pretty low.
Short answer? If you don't want to disconnect, in addition to checking for heat, with your safety measures in place, at least check the bank voltage before removing caps.
