I succesfully build an Arduino Uno which measures a lithium battery array which has 28.7V which gets charged with an 7A 24V (4 x 30W solar panels) and a P-mosfet controls the charging from solar panel to the battery array.
BUT when battery is charged , the mosfet stops the charge, the SOLAR PANEL positive gets disconnected. It gets to 44V in open circuit.
So is there a brake, stop, ceiling to test to get to safe voltage value before turning on the charging-P-Mosfet?
Just tried a load (100 ohms 40w resistor) and only get from 44 to 40V ... so I don't want to fry my P_MOSFET GATE