I was giving more time looking for schematics and ways to connect all...
figure 1 is to switch the high side from solar panels to the battery
Using 5.1K or 6.8K would get the max Voltage of Solar panels (47V without load) under the 20V Vgs of the P-Channel Mosfet , but when charging voltage drops to the battery voltages which goes from 21 to 29,4V (this translates from 8,5-12V as Vgs in the GATE.
I remember you told about the zener to control the Gate voltage which controls the peak (47V translates to 21,2V which the Zener would block) and the operating value of the Battery would go from 9,5 - 13,2V (battery from 21 to 29,4V)
If the zener way is the way to go, is it better to have a 10V zener or just a 12V or even 15V zener?
how much wattage should I calculate for the zener?