How Solar Panels + LED Work Together
When a buyer asks why the cheaper unit failed in year two while yours is still running in year four, the answer is almost always in one of four components. Here's what each does — and how each one fails.
Every spec question worth asking — about lumen output, battery life, sensor range or operating temperature — traces back to one of four components. Understanding what each does, and where each one fails when it's underspecified or cheaply built, gives you the right questions to ask before an order is placed rather than after a site visit is required.
1. Photovoltaic panel. Modern monocrystalline silicon converts roughly 20% of incident sunlight into DC electricity. A 6V/3W panel can produce 6,000–8,000 mAh of charge on a clear day.
2. Charge controller. A small chip that regulates the flow from panel to battery — preventing overcharging, optimizing charge current, and managing the panel-to-battery handoff.
3. Battery. LiFePO4 cells store the daytime charge. Capacity ranges from 2,000 mAh (basic stake lights) to 30,000+ mAh (street lights with overnight + reserve capacity).
4. LED + driver. The driver converts battery DC into the precise current the LED chips need. Modern LED chips achieve 150+ lumens per watt — meaning a single 3W chip can produce the equivalent of a 35W incandescent bulb.
The cycle. 8 hours of effective sunlight produces enough charge to run a typical fixture for 8–12 hours at full brightness, plus a 2–3 day reserve in PIR or dim modes.
When all four components are correctly sized, the system runs reliably for years. When any one is undersized — most commonly the battery — the fixture goes dark by 2 AM.