Rare are my comments, but there it was .... Good quality product but no return when little sunny day. This is not the fault of the product itself, but because of the technology used. Tech Talk: Monocrystalline silicon panel to the cells. On a sunny May day in Valenciennes (rare), recorded maximum instantaneous power: about 5w barely 40Wh of energy supplied throughout the day. The next day, sunless day: barely 2w instantaneous power. Result: Panel allowing only maintain a 12v battery with capacity 7Ah short use receivers. Note that the test was done by measuring the current output on a resistive load adapted with a digital ammeter. Then the test was done with a recommended regulator: it was worse: loss in the series regulator. Then test done with a regulator commonly called MPPT (switch mode controlled): This denier can not do anything if the panel delivers little, even by optimizing the voltage / current. Conclusion: unless you live in the south or only require a low power: monocrystalline technology to forget. Expect an average yield of 2w. Comments fanciful. I should not have taken into account.
