There are PWM and MPPT controllers. You want MPPT. For serious solar you need to google Morning Star, Blue Sky and some others. Many RV solar dealers will do a better installation. The solar prep, especially if it is only 10 amps is just going to keep your battery from running down in storage. When people hear 10 amps they are wowed but do the numbers. A 10 amp solar on 12 volts is only 120 watts. Equivalent to one light bulb in a stick & brick house. Current times voltage equals watts. I have a 120 watt portable unit because I dry camp 2 weeks a year. My RV is plugged in or moving the rest of the year. Plus I kick my generator on in the mornings while dry camping. You may want to be thinking 60 to 80 amp mppt controller. An 80 amp controller will give you 960 watts. If you buy a large controller you can add more panels as needed. Don't know where you live but talk to some Solar dealers first. I think you would be wasting money on a manufacturer prep unless it was an 80 amp. Think you would be looking at #4 wire. JMHO