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Old 04-29-11, 09:37 AM   #1
fabieville
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Default Using an Mppt charge controller on a windblue 540 pma

I was wondering if using an mppt charge controller on a windblue 540 low wind pma would increase the power output that is going to the battery.
Here is my theory:
We all know that Mppt charge controllers converts the excess voltage (VOC) coming from your solar/wind power to amps.
I have a windblue 540 low wind pma and the current output is so small.The most I see out of it is about 4amp. I realize thou that the Voltage at Open circuit (VOC) goes up to all 40volts most times.
So I am guessing that if the current at that time is about 4amp then the total wattage would be 40 x 4= 160. Running that through a mppt controller you would get about 13.8V at approx. 11 amps after the mppt does its conversion in micro seconds instead of getting 4 amp at 13.8V using a regular dump load controller.
Please tell me what you think. Could this actually work?

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Old 04-29-11, 07:15 PM   #2
Xringer
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If the voltage is up in the charge range of the battery, (When connected to the battery)
I don't think it's going to get any better than that.

In the case of PV, MPPT isn't getting any extra power, beyond the spec of the panel,
it's just matching the load to the source better. Letting the PV work in it's sweet spot.

With wind, the sweet spot is higher off the ground and faster wind..
To get more power, you need more RPMs.


If your load is too much for the PMA, it will start slowing down the blades.
If your load is light, the RPMs will be higher and less power will be harvested.
So, maybe some kind of MPPT would give you a better transfer of power,
(If your load isn't well matched to the PMA already)
but there is only so much power in the wind at a given speed.

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