One panel 24 volt battery

Julian-Indaiatuba · Feb 15, 2020

Hi,

Sorry if this is a dumb question but I’m still new to all this solar stuff.
I would like to know whether it’s possible to charge a 24 volt battery with one 330 watt solar panel which has a Vmp of 37,2 volt.
Thank you in advance.

SolarRat · Feb 15, 2020

Yes, you just need a MPPT charge controller.

Julian-Indaiatuba · Feb 15, 2020

SolarRat said:
Yes, you just need a MPPT charge controller.

Thanks for your quick reply.
I already have a PWM charge controller which can handle 24 volt. Can’t I use that for the time being or does it have to be a MPPT?

SolarRat · Feb 15, 2020

Julian-Indaiatuba said:
Thanks for your quick reply.
I already have a PWM charge controller which can handle 24 volt. Can’t I use that for the time being or does it have to be a MPPT?

It will work IF it can handle a ~40v input, but you'll probably be leaving power on the table. Maybe a 15% reduction over an MPPT because it will probably only use about 30-32v from that 37.2v panel where the MPPT will use all you give it. Doesn't hurt to try if you already have it.

PWM's are made for a specific input (12v or 24v solar panels), MPPT's can take a higher voltage and use all of it no matter the size of the panel or battery.

Julian-Indaiatuba · Feb 15, 2020

SolarRat said:
It will work IF it can handle a ~40v input, but you'll probably be leaving power on the table. Maybe a 15% reduction over an MPPT because it will probably only use about 30-32v from that 37.2v panel where the MPPT will use all you give it. Doesn't hurt to try if you already have it.

PWM's are made for a specific input (12v or 24v solar panels), MPPT's can take a higher voltage and use all of it no matter the size of the panel or battery.

Thanks again for your answer.
I think I’ll connect it to the PWM for now but will take your advise, do a little research about getting a MPPT in a couple of months. I only have the one panel now but want to add another 3 or 5 so probably makes a lot of sense getting an MPPT anyway. Just need to choose one...
Thanks again!

Supervstech · Feb 15, 2020

Check the voltage on the solar inputs with the pwm controller... odds are good, once the batteries are connected, the panels will get shunted down to battery voltage... losing you about 17V, and the watts with it...
but, yes, it will function.

One panel 24 volt battery

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