12v battery/ 12./24v MPPT ~ 24v PV Panel
This question troubles the Old and Slow mind. I have a 24v/120w Cynergy PV panel. I would like to use it for duel purpose. For my 24v e/scooter and my 12v RV, not at the same time. The MPPT states (15...
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My 12/24 PWM controller is like that. You connect to battery first, its little brain notices whether voltage us under 17v, if so it says must be a 12v battery and sets for that. If it sees 17 or more it says must be 24v and sets up for that. Now you can connect the array.
Now here is the fun part. With my PWM on a battery it will get Isc of the panel. Isc on a 120v 12v panel is 6.7a approx., and that's what you get. But if the panel were 24v Isc would be half that so lets say 3.35a. Now all the 12v batts will get is that 3.3a
BUT if I had 24v batts and my 12/24 controller and a 24v 120v panel, I would still only get that 3.3a but now that is just as good on the 24v battery as 6.7a was on the 12v battery.
Now the interesting part--what if that controller were MPPT instead of PWM? Aha. Now with the 24v panel and the 12v battery, you will get something like that 6.7a instead of just the 3.3. In fact you could get 10% more than 6.7a because it is that magical MPPT. (maybe 7.37 amps)
Just try it out and see what happens. :)
Now here is the fun part. With my PWM on a battery it will get Isc of the panel. Isc on a 120v 12v panel is 6.7a approx., and that's what you get. But if the panel were 24v Isc would be half that so lets say 3.35a. Now all the 12v batts will get is that 3.3a
BUT if I had 24v batts and my 12/24 controller and a 24v 120v panel, I would still only get that 3.3a but now that is just as good on the 24v battery as 6.7a was on the 12v battery.
Now the interesting part--what if that controller were MPPT instead of PWM? Aha. Now with the 24v panel and the 12v battery, you will get something like that 6.7a instead of just the 3.3. In fact you could get 10% more than 6.7a because it is that magical MPPT. (maybe 7.37 amps)
Just try it out and see what happens. :)
