PV: the battery to the battery charge problem
I use the BUCK circuit, controlled by the microcontroller, the circuit is not too difficult, are ready, but the understanding of BUCK problems. See a lot of books are written on the battery can be constant pressure charging, feeling can not understand. Now I think they are probably wrong, the voltage across the battery in the BUCK circuit is out of control.
Battery affected. Then according to the volt-ampere characteristics of solar energy, we can know that the actual output power of the solar panel is less than its nominal power.
Yes, for example: the battery voltage is 12V, with a 18V solar panels connected to the battery voltage will be slightly higher than the 12V voltage, such as 12.2V look, so the actual working voltage of the solar panels by the
Resistance into the battery, then there is a change, because the battery resistance is constantly changing. When the battery is full, the measured voltage is the float voltage, it is full. When full, cut off the solar energy output, you can protect.
