/diy/ - Do It Yourself

Increase the resistance.

I just went ahead and used loads of resistors in series.

i didnt have to buy anything, i found an old appliance charger rated at 15V DC (my multimeter reads it as 16V ??)

stripped it and attached resistors. using trial and error iv worked out i need 7K ohm to bring it from 16V to 14.9 V (good) and 36K ohm to bring it from 16V to 11.9 V (good).

my total circuit is for solar electricity. theres a solar input, battery and dummy load (for when the battery is full) all connected to a relay and some circuitry. Baisically using potentiometres and the circuitry the relay switches from the battery to the dummy load depending on how full the battery is.

11.9 V of battery charge is what causes the battery to charge and 14.9 volts is what causes the battery to stop charging.