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Forum Index : Electronics : MPPT vs PWM for charging

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TronicSavyyJohn
Newbie

Joined: 31/03/2012
Location: Australia
Posts: 20

Posted: 07:30pm 02 Jun 2014

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Hi All,
I did some comparing of charge controllers, Due to them being designed and made in China i felt i wasn't comparing apples with apples.

I would welcome some feedback and even some findings please.

davef
Guru

Joined: 14/05/2006
Location: New Zealand
Posts: 499

Posted: 10:57pm 08 Jun 2014

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My current thinking that the best use for MPPT is if you use relatively high voltage panels say >50V @ Pmax to charge a 24V battery. Using some 35V Pmax panels to charge a 24V battery doesn't really gain much at all.

You need to be aware of how controller efficiency changes with panel voltage. You may find that really high voltage panels into a MPPT controller may not be as efficient as some intermediate voltage.

One advantage of much higher voltage panels is that you can use smaller wire diameter for comparable line loss.

You may also find that for putting up another panel and sticking with PWM might be a cheaper option.

Good luck!

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