Solar-Powered 12V / 2.4W Battery Trickle Charger £9.99 @ Maplin - HotUKDeals
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Keep your battery topped up with solar power, even if the weather is overcast or dull
· Ideal for cars, caravans, boats etc
· Interchangeable connectors: cigarette lighter plug and crocodile clips
· Durable ABS outer casing
· Built-in diode prevents reverse charging
· Suction cups for easy mounting

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.


Technical Specification

Dimensions of actual cell 29x17 cm
Peak output power: 2.4W
Voltage (@max. power): 17.5V
Current (@max. power): 137mA
Open circuit voltage: 21V
Short circuit current: 225mA
Tested under standard condition: AM1.5, 100mW/100cm² @25°
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All Comments

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Comments/page:
#1
I bought this about a month ago when it was on offer. It's completely useless. Get yourself a proper battery charger instead.
#2
What do you mean, won't it trickle charge your car battery keeping it "topped up"?

What were you trying to use it for?
#3
pet2000
I bought this about a month ago when it was on offer. It's completely useless. Get yourself a proper battery charger instead.


I think the point of these things are for when your car is going to be parked for a food while - eg Heathrow Car park etc. It's not meant to be a replacement battery charger!
#4
Exactly, I am going to be away on holiday for over 2 week soon, leaving my car at the airport, this should ensure that the battery doesn't go flat, thats what the product is for.
Its not meant to be able to fully charge your battery from flat, its meant to keep it topped up.
#5
Mr Doovde;2696307
Exactly, I am going to be away on holiday for over 2 week soon, leaving my car at the airport, this should ensure that the battery doesn't go flat, thats what the product is for.


If your going to do that then expect a broken car window when you get back as someone will think it's charging a laptop or something in your boot.
#6
I'm not actually leaving it at the Airport carpark, i'm leaving it at a friends house and getting a lift to the airport so it'll be fine.
Its still a good deal.
#7
HOT HOT HOT............Great price: Direct link - http://www.maplin.co.uk/module.aspx?ModuleNo=223251&doy=7m8 ;-)
Solar-Powered 12V / 2.4W Battery Trickle Charger
only £9.99 - on sale until 02/09/2008
SAVE £20.00 was £29.99
Order Code: N59FU :thumbsup:
FREE STANDARD UK DELIVERY ON ORDERS OVER £35 (Pick up from store for FREE)
+ 4% Quidco http://www.quidco.com/maplin-electronics/
#8
I've used the 1.5w one in the past - which just about kept the battery charged (although not quite in very cold weather). Plug it in your cigarette lighter and leave it on the dash - it's obvious what it's charging.

BTW keep the receipt, I've had to change a couple of units that failed after about 8 months. Maplins were fine about it
#9
pet2000
I bought this about a month ago when it was on offer. It's completely useless. Get yourself a proper battery charger instead.


Yes, all these (not just Maplin's, to be fair) chargers are, shall we say, extremely optimistic with the power levels they claim. You might get that much juice out of them if you're somewhere inside the orbit of Mercury :-D. However in cloudy old england I've never been able to get anything like the quoted power out of one of these. I did take one to Spain, and at high-noon it was in the ball-park - maybe 30% of the quoted figure, but that was the best I've ever seen from it.
#10
Yeah ,I bought the 1.5w one last year for £9.99 and have used it to charge 12v burgler alarm style batteries and they dont seem to get charged .Left it connected for weeks and it's still nearly flat . I'm beginning to think it's $hi-e.
#11
Mr Doovde
What do you mean, won't it trickle charge your car battery keeping it "topped up"?

What were you trying to use it for?


That's correct, it does not trickle charge enough to keep your battery topped up. If it works, chances are that your battery would have kept it's charge anyway.. Also make sure your cigarrette lighter stays on (connected) when keys are removed (most cars don't) which menas you need to connect directly to the battery. The wires need to go on the outside of your car if your battery is under the bonnet.
#12
ricko
Yeah ,I bought the 1.5w one last year for £9.99 and have used it to charge 12v burgler alarm style batteries and they dont seem to get charged .Left it connected for weeks and it's still nearly flat . I'm beginning to think it's $hi-e.


I don't think these are meant to charge a battery from flat. Thety are just meant to keep it topped up while not in use.
#13
Some flat batteries cannot start to charge unless given quite a high current to kick start them. Even a normal mains powered battery charger will not start to charge many entirely flat batteries.

Large batteries left unused can lose power faster than this charger will replace it - especially if there is not good direct sunlight. However, it should be perfect for people with the likes of a Lotus Elise that has a small lightweight battery (that would normally have trouble starting a car not used often in winter).

In good light this will provide 0.2A current - compared to roughly 35-100A from your cars alternator, or 4A from a cheap battery charger.

If you are leaving your car in a safe place for a while - just disconnect one lead.
#14
I'm a sucker for a bargain and went out and bought one of these at Maplin's yesterday .Instructions say it has a blue flashing lamp ,but I cannot find one anywhere .

Anyway I'm just looking for a cheap Lotus Elise to make use of it :-)
#15
As an ex. electronics engineer of 50 years I can comment here. My experience is practical too, I have TWO of Maplin's 2.4W panels on my Grand Voyager.
1) A solar panel is NOT a battery charger. The current from one into your battery is so tiny there is NO WAY one can be called a "charger".
2) The purpose is to balance out the residual current draw from the various microprocessors in the car with their constant small power draw. Eg., alarms, key signal receivers etc. This current on my motor is supposed to be 50mA, but I've a suspicion it's more. It doesn't sound much, until you remember this is going on 24/7. Leave your modern car parked for a month -- flat battery. Leave your 1970s car parked for a month, it starts. No computers.
3) Lead-acid batteries discharge themselves anyhow just sitting on the bench, it is said at 1% per day. I think this is a bit excessive. I'd say 0.5%.
4) Even if you covered the vehicle's roof with solar panels, it would be impossible to overcharge the battery. A starter battery is far too big, the solar panel current far too small, and we do live in Britain -- not Spain. With your digital voltmeter, check the charging voltage directly across the battery. The float-charge voltage, or anything less is fine. This is 13.8volt. I've known alarm batteries kept at this voltage for 15 years and would still light my test lamp brightly. That's a 5amp draw from a a little battery.
5) The rated power output of a solar panel is obtained when the panel is in BRIGHT sunlight at rightangles to the sunbeam. When off-angle or in diffused daylight it will be A LOT less. There is of course NO CHARGE during darkness.
6) Some cigar lighter sockets will not accept current GOING IN. They will only provide current GOING OUT. My Grand voyager has two of these, the LH one is ok to use as it's directly connected to the battery via a fuse. The RH one is no good because it's switched. No key, no power.
7) The interesting practical stuff -- anything less than about 5watts rating in UK is a waste of time. My TWO Maplins panels at 2.4 watts each is just enough. (Connect them in parallel). A 10watt panel would be better, except it may obscure your vision when driving. With two smaller ones, you can avoid the windscreen's demister slot. FIX THEM TO THE WINDSCREEN!!! A modern winscreen is just the right angle for any british sun you might get. The little suckers they supply are incredible. You've only to touch the glass with them and hold like limpets. Park the vehicle facing the sun at mid-day.
Follow these instructions and you'll be unlikely to be disappointed with your solar panels.
Leedsman.

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