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Please help me select the correct electronic device to control the voltage from an 18v PV to a 12v load while automatically shutting down the power at dark. I purchased an "MPPT 10" charge controller but then learned that this item is a "fraud" and not truelly an MPPT controller. MTTP is...

You and I have similar situations. I'm still trying to solve mine. https://diysolarforum.com/threads/electrical-control-advice-needed.12710/#post-141760 . I'm following your thread.

Yeah, well I bought the panel based on recommendations of others who said panels only put out 80% on average of stated rating. The "12v" panel is mounted to my shed and ain't comming down. It delivers 22v, and I suspect it's the reason why my first pump stopped working while it was connected...

I'm still trying to solve an electrical control problem. I've got a 100w/12v panel powering a small 12v water pump feature. I purposely eliminated a battery from the system because I don't want the pump running all night. The system consists of the panel, a 24v-12v transformer, on/off switch...

OK, thanks. I'll look into it. If I wanted to run the pump off the battery and allow the PV to charge the battery, wouldn't a charge controller be needed to do that?

Yes, the transformer is there to protect the pump. The first pump burned up because I didn't realize the PV produces more than 12v. I understand why the pump cycles, and cycling is fine provided it doesn't do it so frequently. In full sunlight the pump would cycle on for 11 seconds and shut...

OK great. Now we're getting somewhere. As it turns out (and as noted in my first post) I bought an SCC, then found this review of that device which says it's a complete fake SCC. Should I use it? Will it destroy my battery as reported by others. Should I buy another SCC. If so, what brand...

Hey everyone. Could use experts advice to size/spec the correct solar panel to operate a 12v, 3.8amp submersible water pump that will be used in a fountain/birdbath. There won't be battery storage. I just want the pump to run while the sun is shining. Also, where would I source such a panel...

Thanks for the reply. So I assume you're saying I need a panel set-up that puts out at least 45.6W. I found one that's rated at 50W that "produces on average 12.5 Amp-hours/150-Watt-hours per day" and is for 12v systems.