Flexcharge NC12L-12 Solar Charge Controller for Lead Acid 12V Batteries [COY]
I've used this in a small RV with heater and the heater blower could draw more than 12 Amps, so use this with
small fans instead.
This controller will preserve the health of a lead acid battery by shutting down when too much power is drawn.
That is a nice feature for remote gate operating, irrigation, flashing signs, etc. where you come to the site it is used weekly or so.
The shutdown feature is inconvenient in a daily use RV setting, since it needs a manual reset when that happens.