# how can i build a trickle charger?

I want to build a solar powered battery charger so i need to know how to build a trickle charger i can hook the solar panel up to

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Dr.Bill8 years ago
not really interested. huh.
Dr.Bill8 years ago
I have a very simple tricle charger that works off a power supply. uses a relay and a diode and a resistor And works very well without the overheating problem. cannot over charge the batt., And has a power tap for powering a shortwave radio. Interested? Private Message Me.
110100101108 years ago
diode to as high current as you can (atleast 5 A)

resistor : R ohm = (volts of panel - volts of battery - 0.7) / amps of diode

for example 12 V battery / 16 V panel / 5 A diode

R = (16 - 12 - 0.7) / 5 = 3.3 / 5 = about 0.6 ohm

a 24 V 40 W or 12 V 20 W lightbulb is appropriate resistor in the example

now just connect all in series with the diode pointing from the solar panel to the battery

Brakermaker (author)  110100101108 years ago