I just got a outdoor solar powered LED lamp to illuminate our house number at night. It is supposed to charge up its battery during the day, and automatically turn the LED on at dusk. The problem I'm discovering is that the solar panel on this lamp doesn't get enough natural light to charge it so that it can power the LED even for a few hours at night. I like the light fixture well enough so I'm thinking of keeping it but giving it some help.
I have a door bell and opener circuit located under the lamp that runs off a transformer. I was thinking about giving the LED lamp some help from this circuit. Here are the specs for the LED lamp and the doorbell circuit:
LED lamp: SMD 5630 LED 0.5 W, 3.2V 1000mAh Li-ion battery
Doorbell transformer output: 16V AC 30VA (but I measure 18.25V AC at the output)
Would this be a complicated exercise? I have some soldering skills but I need help figuring out how to step down the voltage and amperage to feed the light from the doorbell. I'm assuming that with the proper step down I can wire in the power from the doorbell to the same place the little solar panel is attached to augment the same charging circuit in the light?
Any help would be greatly appreciated!
Back of PV and battery (blue and yellow wires from PV, blue and red from battery
Circuit board. The IC is labeled: 8182 4K154
During the day the battery charges from the PV, at dusk the LED switches on and is powered from Battery. Could I maintain the switching capability and just power the LED with appropriate 3.2V power supply? Will the PV be attempting to charge my power supply during the day?! I don't want to cut out the PV since it appears to be the dawn/dusk switch as well...