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MPPT circuit
By GlutealCleft, Section Controls Posted on Sun Jun 17, 2007 at 12:21:05 AM MST
Help a simpleton...

So, I've been thinking about how MPPT chargers work. Or, at least wondering how the work. The little I've seen says that they're very difficult or expensive to make... but the more I think about them, the more they seem like they're just a switcher which bases the PWM on the input voltage instead of the output voltage. Am I missing something, or is it really that simple?

MPPT circuit | 2 comments (2 topical)

Re: MPPT circuit (3.00 / 0) (#1)
by RogerAS on Sat Jun 16, 2007 at 06:34:40 PM MST

Hey,

Not an electronic guru but I thnk you have the MPPT function a little too simplistic.

The spaces in a PWM are the problem. Those spaces transfer little if any power. This is how my C-40 works and it's not an mppt it's PWM.

MPPT's, as I understand them, converts voltage OVER the battery nominal into extra amperage for the given bank voltage. Say a PV is running at 26V+- unloaded. Connect the MPPT to this and a 12V bank. The Bank voltage is at a state that will accept the full power the PV can produce, but not the voltage. The MPPT converts the OVER voltage into extra amps at a voltage the batteries like. Even this is over simple as to the workings of a good one.

I yeild the floor to Flux now :-)
Roger AS
9 Years off-grid & counting

Re: MPPT circuit (3.00 / 0) (#2)
by jimovonz on Sat Jun 16, 2007 at 06:54:22 PM MST

There was a discussion on how they work not long ago. You can find it here

MPPT circuit | 2 comments (2 topical)

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