adamwelchuk / pwm85 Goto Github PK

Hi Adam.

What is the difference between PWM way of charging a battery and connecting a solar panel to a buck converter that is set to output battery floating voltage?

Regards, Sergiy

Hi,

you make great videos, so thanks for making them! :-)

I have a question about this PWM controller. As I understand it, you measure the voltage at the battery, and if it is below maximum charge, the solar panel is connected directly to the battery.
If the voltage starts to rise, you use PWM to "lower" the voltage as not to overcharge the battery until it presumably turns off.

Now, when the battery is, at let's say 9V, the solar panel will operate far from it's desired maximum power point. So I was wondering, why not measure the voltage at the solar panel, and adjust the PWM so the panel as kept at it's preferred voltage near maximum power? In a very simple implementation this could be 75% Voc and reasonably close. Seems to me a good approximation to mppt before actually using mppt.

Also I'm thinking about a supercapacitor as load, so discharged starts and 0V which is very far from the maximum power point.

Cheers!