William_H
Well-known member
I understand the concept of MPPT and I have built a switch mode voltage reducer to produce 14v for battery charging from a (40v max) solar panel.
The nature of the switch mode converter is that as it sucks power from the solar panel it reduces the solar panel voltage so increasing the current needed to produce the required voltage. This increased current pulls down the solar panel voltage further so that on a small panel it almost imediately takes the panel away from its max power point until it produces nothing.
Now I figure I can detect the panel voltage say about 30v and if that falls lower, throttle back the converter (using a spare built in comparator) . Hardly proper tracking of max power point but better than nothing.
My question is how do MPPT controllers actual determine and control the voltage/current to kep it at Max Power Point?
The nature of the switch mode converter is that as it sucks power from the solar panel it reduces the solar panel voltage so increasing the current needed to produce the required voltage. This increased current pulls down the solar panel voltage further so that on a small panel it almost imediately takes the panel away from its max power point until it produces nothing.
Now I figure I can detect the panel voltage say about 30v and if that falls lower, throttle back the converter (using a spare built in comparator) . Hardly proper tracking of max power point but better than nothing.
My question is how do MPPT controllers actual determine and control the voltage/current to kep it at Max Power Point?