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I connected two of these panels to the 12 volt battery on my boat. The first week was fairly sunny and my battery voltage went up by 0.5 volts. But the second week was dull weather and my battery was drained, dropping by 2 volts. I am now trying to add a low current controller to stop these panels from discharging in poor weather. Why don't the manufacturers include a low current blocking diode (costing only a few pence) in this device? Then I could give this solar panel 5 stars.
Verified purchase: Yes | Condition: New
Does what it needs to do as long as the panel wattage isn't too high. If you want to keep your 12V battery topped up using a 5W panel then this is just the job. Used the load terminal to drive a 99p digital voltage meter with excellent results.
Verified purchase: Yes | Condition: New
Very good
Verified purchase: Yes | Condition: New
Used to make a small battery charger for a motorcycle in storage.
Verified purchase: Yes | Condition: New