I was flush with house sale money, so when various solar savvy people said I needed the Morningstar TS-MPPT-45 charge controller, which cost more than $500, I said okay and ordered it up.
The experts recommended the TS-MPPT-45 because of the high voltage output of my panel—38V. Also, at the time, the same experts were dismissing PWM controllers as old fashioned. They also said MPPT controllers were a better choice for the sealed AGM batteries I wanted to use. (More about the batteries in another post.) They knew more than me, so…
Other than the expense, there have been no problems. The only oddity was discovering it throws a weird error code when the Rolling Steel Tent is parked for the night under a certain type of artificial light, like those used in the RV parking area of the Q Resort & Casino near Los Algodones, Baja California. It resets itself when the sun comes up, so no big deal.
Besides, the controller’s size and big heat sink fins impress the hell out of some people. “Oh, yeah, I’ve got a small nuclear reactor in here.” Or, “I’m in direct communication with the Mars Rover.” Or, “It’s part of a system that reads minds and beams thoughts into your head.”