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I tested it; it got just over 200 mAh in free air early afternoon, clear sky; and some 30 mAh in the fading evening light behind glass.
We'll see if it does tend the battery enough to raise the voltage to a healthier level.
The panel is meant for indoor use btw. That's why it can be very light, that's why I got it.
I already have a 9W outdoor panel, but couldn't mount it in or on the car in any reasonable way. It now charges our emergency torch. Behind glass...
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2011 Honda Insight + HID, LEDs, tiny PV panel, extra brake pad return springs, neutral wheel alignment, 44/42 PSI (air), PHEV light (inop), tightened wheel nut.
  lifetime FE over 0.2 Gigameter or 0.13 Megamile.
For confirmation go to people just like you.
For education go to people unlike yourself.
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