Oh No ! I bought a Mppt Solar Controller
I don't believe it ! I bought it and I don't really even want it ! I was sure this would go for more than 12 bucks. Fooled me, oh well. Whats w/ links not working ?
Forum Discussion
UPDATE--hooked up, some first results below:
I won't be able to test it as hooked up till later on, but looking inside, the circuit board (both sides) has no inductor coil at all. The unit is very light-weight and has smaller hole wire terminals than the LS2024. Not sure yet what gauge (it took #10), but the LS2024 can take #8.
There is no battery type selection as with the LS2024, and mine did not come with the promised instructions. Those are on-line with the ebay ad, though. I have no info on its Voc rating limit, so I will not try it on a couple of 12s in series, which would be approx. 44v.
I don't think this will do for a real 24v panel like a 230w. No idea. You need the Voc limit.
I should be able to tell what sort of charging profile it has once I get a chance to play with it. I don't even know yet if it is series or shunt as a PWM.
UPDATE #1: #2 below that.
OK, hooked up, no smoke. Got 7.8a showing (panel rated at 8.2a but some cloud /haze going on.) Solar spotty right now, need clear sky steady state to compare amps Isc at panel vs Trimetric to battery amps from the controller.
Meanwhile, I did note the voltages at the controller's terminals while it was hooked up and operating. Array side 13.02v, Batt side-12.81v
That's it until I can get steady blue sky and also must wait to find out what sort of charging profile it has and its high set-point.
UPDATE#2
Got some clear blue steady so new set of readings, for whatever they might mean:
Bank is 490AH approx at about 83% SOC. Controller model is 20 amp CMTP02. Panel is 130w Sharp 12v rated 8.2a Isc
Panel Isc 8.23a, Amps to battery from Trimetric 7.8 plus add .3 for standing load at the time, = 8.1a
Panel Voc 20.2v, (measured close to controller with controller array side disconnected) Controller array side 13.16v, Batt side 12.92v, Trimetric 12.9v
I won't be able to test it as hooked up till later on, but looking inside, the circuit board (both sides) has no inductor coil at all. The unit is very light-weight and has smaller hole wire terminals than the LS2024. Not sure yet what gauge (it took #10), but the LS2024 can take #8.
There is no battery type selection as with the LS2024, and mine did not come with the promised instructions. Those are on-line with the ebay ad, though. I have no info on its Voc rating limit, so I will not try it on a couple of 12s in series, which would be approx. 44v.
I don't think this will do for a real 24v panel like a 230w. No idea. You need the Voc limit.
I should be able to tell what sort of charging profile it has once I get a chance to play with it. I don't even know yet if it is series or shunt as a PWM.
UPDATE #1: #2 below that.
OK, hooked up, no smoke. Got 7.8a showing (panel rated at 8.2a but some cloud /haze going on.) Solar spotty right now, need clear sky steady state to compare amps Isc at panel vs Trimetric to battery amps from the controller.
Meanwhile, I did note the voltages at the controller's terminals while it was hooked up and operating. Array side 13.02v, Batt side-12.81v
That's it until I can get steady blue sky and also must wait to find out what sort of charging profile it has and its high set-point.
UPDATE#2
Got some clear blue steady so new set of readings, for whatever they might mean:
Bank is 490AH approx at about 83% SOC. Controller model is 20 amp CMTP02. Panel is 130w Sharp 12v rated 8.2a Isc
Panel Isc 8.23a, Amps to battery from Trimetric 7.8 plus add .3 for standing load at the time, = 8.1a
Panel Voc 20.2v, (measured close to controller with controller array side disconnected) Controller array side 13.16v, Batt side 12.92v, Trimetric 12.9v
