So, I need to park motorcycles over the winter in a spot that has no electricity. I would like to hook up battery tenders to the bikes, and I was considering the easiest way to be a cheap bastard and yet have a solar panel maintaining motorcycle batteries. How about a single 60 watt solar panel, and two cheap battery charge controllers hooked up to it in parallel, with a motorcycle hooked up to the battery connections of each of the 3-stage charge controllers? I think the two battery charge controllers can probably share a solar panel. I guess that when there isn't full sunlight hitting the panel to charge controllers won't really be doing anything for the battery, but that's okay, because I'm really just trying to maintain charge. Or alternatively, can I be really really cheap and hook up both motorcycles in parallel with one another to a single charge controller? The only problem I can foresee is that the batteries will try to equalize when connected first connected in parallel, so I probably want a current limiting resistor somewhere in series to make sure that the two batteries can only transfer charge between themselves at a couple of amps max. Thoughts?