Editing Sun Tracker or Irrigation Timer to drive motors

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[[File:DC_Solar_to_15vdc+trickle_charge.kicad_pcb]]
 
[[File:DC_Solar_to_15vdc+trickle_charge.kicad_pcb]]
 
[[File:DC_Solar_to_15vdc+trickle_charge.sch]]
 
[[File:DC_Solar_to_15vdc+trickle_charge.sch]]
 
Why is that R4 15 ohm resistor in there? Here I am 5 years later trying to remember why, since it is not necessary, except I remember the current regulator was dropping a small voltage across itself and the final charge on the battery was thus less than 100% capacity; maybe 70%. So the 15 ohm resistor is so huge that for example: 1/2 volt results in a 1/30A trickle to top up the final charge on the battery to something higher by 1/2v than what the current regulator can do because it loses some voltage across itself. If my voltage regulator was 1/2v higher it might have been better for my lead-acid battery and then I could have left out the 15 ohm cheat, for top up trickle charge to a final voltage closer to the voltage regulator output voltage than the current regulator's output voltage.
 

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