Solar-Powered Battery Trickle Charger safe or not?

[omodos]

Hi there alas dont drive my x5 too often in the summer so was wondering if the following is any good?or if it will be damaged by my battery lighter socket outputting power to it?I know for a fact that when the ignition is off the dc socket stil has power to it, so not sure how this will work, thanks




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Solar-Powered 12V 1W Battery Trickle Charger

only £5.99 - on sale until 01/09/2009
SAVE £2.00 was £7.99
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Order Code: N47GR
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Product Features

• Keep your battery topped up with solar power, even if the weather is overcast or dull
• Interchangeable connectors: cigarette lighter plug and crocodile clips
• Durable ABS outer casing
• Built-in diode prevents reverse charging
• Suction cups for easy mounting
• Ideal for cars, caravans, boats etc

Designed to trickle charge 12V lead acid batteries with no additional running costs. Ideal for cars that will be left standing for long periods, as well as for maintaining batteries in caravans and boats. The built-in blocking diode prevents reverse charging from the battery to the solar panel at night.
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Technical Specification


Technical specifications: Peak output power:1W Voltage (@max. power):17.5V Open circuit voltage:21V Short circuit current:90mA Tested under standard condition: AM1.5, 100mW/100cm² @25° Cigarette lighter plug fuse rating:0.5A Cable length:2.7m (9ft) Dimensions:354mm (l) x 100mm (w) x 14mm (d) Weight:500g

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Frequently Asked Questions
Q- This unit works great charging up my 20 amp 12volt lead acid battery and was a great buy!! :-) - Victor
Answer- thank you very much for the feedback
Q- Does it charge gel cell batterys - M Dowsett
Answer- No sorry this product does not support that.
Q- As the panel charges my battery, can I use it at the same time? - Thomas
Answer- yes you can (although for it to be effective it is recommended that the device you use does not consume more power than the panel is outputting to the battery).
Q- hi will this charger cut out when the battery is fully charged and is there a warning light to tell you so. richard. - richard
Answer- No, with such a low wattage it is not neccessary.
Q- Will the unit be effective through the windscreen, if placed on the dashboard of a car. - Jim Smale
Answer- Yes it will.
Q- I intend to use this for my boat.It will be exposed to rain, wind and salt water. Can it resist all these elements. - cammy
Answer- The item is not going to be suitable for exposure to salt water i am afraid.
Q- i see its not resistant to salt water but what about rain? - Rich
Answer- the item is ok for use in light showers but in heavy rain etc the item would need to be taken indoors.