Hi,
I have 20V PV solar panel. I want to charge 12V automotive battery.
I would like to hack apart some electronics and make a DC/DC converter so I can charge the battery.
Any ideas on how to ? I was thinking of tapping into a PC power supply after the rectifier, and using the supply to convert
20V DC into 12V DC?
This is going in a VW camper van. I have a few spare voltage regulators from the VW.
It looks like the VW voltage regulator works by varying the voltage to the "field" coil in the alternator. If the output voltage from the alternator is too great, it reduces voltage to the field coil. If the voltage from the alternator is too small, it increases voltage to the field coil.
So, the regulator has
1)V+ input (this voltage is output from alternator)
2)V+ output (for field coil input on alternator)
3)ground
4)V+ output (to battery to be charged)
would there be a way to use this scheme to control how many volts get to the battery?
I was thinking of maybe a variable resistor that can be controlled by an analog input voltage. Mimic the field coil/ alternator with another device.
There is no coil in the solar panel. I have "constant" voltage output from it.
The regulator increases one of it's outputs (output to field coil in alternator) if the power input is too low.
the regulator decreases the output (output to field coil in alternator) if the power input is too high.
How to regulate +20v from PV panel with this inverse proportional analog voltage?
Jen