12th May 2016, 04:11 PM
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Senior Member
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Join Date: Dec 2014
Location: Cheshire
Posts: 1,601
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Quote:
Originally Posted by ainarssems
After playing with solar sunroof to charge battery last year I did not have much hope for this charger but at £13.99 it was cheap enough to try it out.
So it arrived today, it says in specifications ratings at max power: power 2.4W, Voltage 17.5V, Current 138mA. I tried it on old, half empty but still usable battery in the garden with the panel pointing directly at sun. Open circuit voltage 23V, battery voltage 12.28V without charger connected, 12.3V with charger connected and slowly climbing, current 151mA, total power 1.85W.
So it's pretty much as I anticipated, it will not charge up flat battery, might just stop it from discharging during bright daylight sun but will not charge enough to make up for the charge lost during dark hours. Overall it will slow down discharge so your battery might last 1.5 months without driving instead of 1 month. To keep battery fully charged you would need 3 of these panels or 1 that is 3 times the size assuming it will be pointed directly towards sun.
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Mine came yesterday. The plan being to install it in a car at the in laws place in France. I too thought it was worth a £14 punt...
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2010 A8 SE Executive 4.2 FSI D4
2007 Mini Cooper S R56
2008 D3, gone, but not forgotten after 9 years and 90k.
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