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I have a led string patio lights, which was manufactured in china. The led string has a solar panel and insight it, a couple of 18650 rechargeable batteries connected to a circuit board with an 'RP-TZ15C' identifier engraved in the board I've been investigating about how to solve my problem with it, because I've bought two (2) in a row, and both have the same problem: they worked great for about one and a hal months, and then stopped to work at all. The problem is like this: The small solar panel suppose to charge the 18650 batteries inside it when the sun shines, and when its dark, the voltage drop (the device does not have a light sensor, I've checked) should trigger the circuit to turn on the lights. Then, after the charge depletes and/or the sun shines again, the charging cycle should restart again, and the lights should be turned off accordingly.
Here you will see some pics about the device:
Thinking the problem could be the batteries, I've also bought a rechargable kit with a wall charger, and replaced the batteries with the new, fully charged set, just to see that the panel works only one or two days tops.
Any ideas?
Enviaste
This topic was modified 7 months ago by dnaranjor
Posted : 27/09/2025 9:48 pm
The light sensor is probably based on the output voltage from the panel - the lamps turn on when the output drops below a preset level.
You might start by checking to see if the panel is operating correctly in sun and dark by measuring how much output it's delivering.
Take everything I say with a pinch of salt, I might be wrong and it's a very *expensive* way to learn!
Posted : 28/09/2025 4:35 pm