So I'm trying to figure out how to safely power a small 12V deep cycle battery with a home built wind generator. It's a 36VDC motor that outputs around 5V with low wind, and 12V with lots of wind (1A - 3A). I would like it to power a small speaker, mp3 player and arduino, so low power consumption. (measured total = 400 mA)
I've looked into MPPT controllers etc, but those seem to be targeted for large 300W+ systems, and are pretty expensive.
My first idea was the following, see schematic
A buck-boost DC converted doubles the voltage, it goes to a LT1038 voltage regulator, that outputs 14.2 volt to the battery. The battery is specced to charge between 14.1v and 14.7v
Is this safe to do?
Is it dangerous to keep the voltage at charge voltage? Or should it be set at float charge voltage of 13.2V?
If you have other suggestions or schematics I would really appreciate it!
I'm also looking at chips like the BQ24450, but it's a steep learning curve.