...first let me say I have no WFCO or PV panel(so I truly don't know)...BUT, I do know you havvta have a charge controller between the PV panel and the battery to regulate voltage...further, disparate voltage sources can be connected to the charge controller(additional PV panels, wind generator(s), etc)...the controller takes these different voltage sources, combines 'em and puts out a constant voltage to the battery...soooooo, maybe you can take the DC output(for the battery charger) from the WFCO and run it to the charge controller, along with the PV panel and then run the output from the controller to the battery...I sure as heck wouldn't take what I just said as sound advice without checking with an expert on such things!!!!!!!!!
madjack
p.s. after reading what I just typed, I realized it probably doesn't/won't work thataway since, the charge controller would block the battery voltage from feeding back thru the WFCO to power your 12DC appliances with the battery...if your not confused by now...never mind and if you are still confused...never mind
.................mj
...I have come to believe that, conflict resolution, through violence, is never acceptable.....................mj