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Post by fopoku2k2 on Apr 28, 2015 14:07:06 GMT -8
Quick question. I just bought two 250 watt solar panels rated at 8.27 amps & 37.7 volts each. Can I connect them in parallel to my existing pwn charge controller rated at 42 volts maximum solar input voltage and 30 amps rated load and charge current.
My system consist of 24 volt batteries
Thank you
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Post by Admin on Apr 29, 2015 12:03:05 GMT -8
A 30 amp PWM controller when charging 24v can support up to 42v input and a max of 720 watts.
So the max you can do is those two 250 watt panels in parallel.
Hope this helps!
Let us know if you have any other questions.
Regards,
AW
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Post by fopoku2k2 on Apr 30, 2015 6:18:03 GMT -8
I am advised that if I connect the two 250 watt panels in parallel to the charge controller I would not be getting the full potential of the panels. And that I should use an mppt charger controller
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Post by Admin on May 8, 2015 7:42:19 GMT -8
Hello fopoku2k2,
I apologize if our last comment caused any confusion. You can use 2 250W panels in parallel on a 30A PWM to charge a 24V battery bank. PWM controllers are generally around 79% efficient, so you will be losing some power and not getting 500W of power into your batteries. An MPPT controller is generally 94+% efficient, so you are getting closer to the 500W of power from your panels into your battery bank.
If you can afford an MPPT, in my opinion it is the way to go since you are getting 15+% more power into your batteries than with a PWM.
Renogy Tech Support
SR
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