Hello, I have a technical question for 12V solar folks.In the process of building an off-grid solar set up for my camper trailer. Just need enough juice to keep the fan running in the propane fridge and to power the blower on the propane heater plus the lights and water pump.Going to do a 200 amp hour gel battery and two 100 watt panels. A couple of months ago I bought a new-in-box 100 watt panel at an estate sale that I was told was for a 12V system. Reading the back of the panel I don't see 12V anywhere...