A lighting distributor from Lagos visited the factory this week with a bag of failed components and a straightforward request: show me why these died, and show me how yours are different.

He had been importing solar products for years. Some batches worked. Others failed within months, and the returns were eating his margin and his reputation.

The Failures He Brought

None of these are exotic failures. They are the predictable result of shaving cost at the component level and skipping tests at the factory level.

The Checks We Ran Together

1. Open the battery bay. He compared cell packaging and welds between a cheap pack and ours. The difference in tab thickness was visible without instruments.
2. Look at the gasket layout. One continuous seal around a complex housing is a leak waiting to happen. Separate seals per compartment are slower to assemble and far more reliable.
3. Check the driver. Potted drivers survive humidity; open boards do not. He asked for the potting compound specification, which is the kind of question that separates a buyer from a reseller.
4. Ask for the aging log. Every unit runs under load before packing. When a batch fails, the lot is held, not shipped.
5. Confirm spare parts. Drivers, sensors and battery packs should be orderable separately for at least the warranty period.

What Good Looks Like

We also spent time on what a healthy installation should look like after two years, because that is the point where cheap products and durable ones separate. A good lamp keeps its output within a predictable depreciation curve, shows no condensation behind the lens, and still reports a sensible state of charge on a grey morning.

He asked how to check a batch without a lab. The practical answer is a small sample run: leave five units on a test street for a month, log the switch-on and switch-off times, and open one housing afterwards to inspect the gasket and the battery pack. If the seal is dry and the cells are balanced, the batch is likely sound. If there is moisture or the pack is swollen, no certificate will save it.

What He Ordered

He left with samples from two series and a plan to test them on a single street before replacing his stock. That is the right order of operations. A street test costs almost nothing and tells you more than any certificate.

If you are tired of return rates, send us the failure pattern. We will tell you which component is likely responsible and whether the fix is a different product or a different specification.