In Car 240v 75w Inverter - Portable Mains Power RING, end of line basket... - HotUKDeals
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In Store only

* 240v Mains Electricity on the go
* Mini inverter will convert the 12v output from your car cigarette ligher socket to 240v AC
* Rated at 75 watts
* Overload protection circuit and LED power indicator
* This unit works with 12v supplies only

in the bargain bin Tesco Eastgate Extra Centre marked as 5ukp reduced from 20ukp
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#1
http://ecx.images-amazon.com/images/I/41ThglaMCaL._SS500_.jpg
#2
Nice, want one but not sure why!
#3
Wouldn't this ****** the battery? I'm curious to find out
#4
I can't find it on the site.
banned#5
diabeticguy;1835396
I can't find it on the site.



In Store only
#6
You can get a device (from Maplins I think, about £5 to £10) that plugs into your cig socket, then a device like this one would plug into it. It monitors the current from the battery, then stops supplying power if the car battery starts to get low, so you never run it flat. Well worth getting.
#7
Ben Dudeman
You can get a device (from Maplins I think, about £5 to £10) that plugs into your cig socket, then a device like this one would plug into it. It monitors the current from the battery, then stops supplying power if the car battery starts to get low, so you never run it flat. Well worth getting.
this is different this converts ur 12 volts from ur car battery to 240 volts,but this sort of device is only good enough to power mobile phones or similar,a laptop requires roughly 150 watts so this would not power one,just in case in case anyone thought of buying one for that purpose
#8
Ben Dudeman
You can get a device (from Maplins I think, about £5 to £10) that plugs into your cig socket, then a device like this one would plug into it. It monitors the current from the battery, then stops supplying power if the car battery starts to get low, so you never run it flat. Well worth getting.


marsh5000
this is different this converts ur 12 volts from ur car battery to 240 volts,but this sort of device is only good enough to power mobile phones or similar,a laptop requires roughly 150 watts so this would not power one,just in case in case anyone thought of buying one for that purpose


What Ben was saying was that you plug the device from maplins into the 12v first THEN this into it. When the voltage of the battery drops below 10-11v the device from maplins shuts off power going to any other device plugged into it.

Most of the 12v-240v devices have a low voltage protection built in anyway - not sure on the ring product.

In store these looked quite good. I'm sure you could charge some laptops with one of these.
#9
i stand corrected, was just trying to point out that this will not power a laptop sraight from ur car battery
#10
marsh5000
this is different this converts ur 12 volts from ur car battery to 240 volts,but this sort of device is only good enough to power mobile phones or similar,a laptop requires roughly 150 watts so this would not power one,just in case in case anyone thought of buying one for that purpose


Amazing ... thanks for the tip mate ... I was just thinking of buying to use for my laptop ...
#11
SanjayShetty
Amazing ... thanks for the tip mate ... I was just thinking of buying to use for my laptop ...


Most laptop power adaptors are 90W, but check your laptop power adaptor. It'll tell you what wattage it is; if it's 75W or less then this thing will be fine for running the laptop.

To be honest though, even if it's 90W or 120W (the latter being very unlikely), it'll be fine for just charging the laptop (rather than powering it while switched on). The wattage rating has to be able to power the laptop when in peak usage (e.g. burning a DVD while also watching a high-def video from the hard disk). Just charging it doesn't even power the motherboard, so it'll be fine with 75W, just take longer to charge.

P.S. This deal is hot. A similar thing in Argos is £25 I think, £30 in Woolworths. Heat, rep and beaucoup de props for the OP.
#12
D00nhamer
Nice, want one but not sure why!


not only me then :p
#13
Would this be good enough to power a portable DVD player
#14
Will it flat my car battery? It is all about watts.

At 240V a 70 watt device (such as a laptop charger) will draw 0.29 amps.
A inverter chops up a 12v supply into psueo 240v AC. If we assume there are no losses in the inverter then current drawn would be 5.8A.

A typical car batter has a capacity of 100's of Amp hours (how long it will last with a 1 amp load)
You should be fine running a laptop for a few hours!!!!
#15
Golaboots888
Will it flat my car battery? It is all about watts.

At 240V a 70 watt device (such as a laptop charger) will draw 0.29 amps.
A inverter chops up a 12v supply into psueo 240v AC. If we assume there are no losses in the inverter then current drawn would be 5.8A.

A typical car batter has a capacity of 100's of Amp hours (how long it will last with a 1 amp load)
You should be fine running a laptop for a few hours!!!!


assuming you have a laptop that will run on 75 watts , so may charge a laptop but won't run one!!

I don't think it will even charge a laptop as the current is drawn by the transformer in the laptop adaptor which in my case is greater than 75 watts. So this adaptor isnt much use.
#16
This should power a laptop. It is an award winning product:

http://www.autoexpress.co.uk/products/products/211659/ring_mp75.html
#17
just been to blackpool tesco and it is full price :( still great deal though
#18
Are these available in clearance all over Tesco in the UK, or just Eastgate? Anyone found them anywhere else?
#19
This will run your laptop and more http://www.argos.co.uk/static/Product/partNumber/7402216/Trail/searchtext>POWER+INVERTER+.htm. A bit more expensive though.
#20
My laptop adapter has no info about wattage, but what it does say is:

Model: SADP-65KB B
Input: 100-240v ~1.5A (1,5A) 50-60Hz
Output 19v --- 3.42A (3,42A)

Now i'm even more confuzzled.

Was gonna go for one , but need to know if it will at least charge the laptop before I do.
#21
Be careful - I plugged my laptop adaptor into a converter (not this one) and it wouldn't even power the adaptor with no laptop attached. So no charging either then :x
I wish I'd known that before I set off on the 600 mile journey with the kids.
#22
AVOID, these items are a joke, your car battery is in no way, shape or form designed to run 240volt appliances and trying to get it to do so will just knacker it. You need a leisure battery with a dedicated wiring for that, not some cheap tat.
#23
tartanfluff
My laptop adapter has no info about wattage, but what it does say is:

Model: SADP-65KB B
Input: 100-240v ~1.5A (1,5A) 50-60Hz
Output 19v --- 3.42A (3,42A)

Now i'm even more confuzzled.

Was gonna go for one , but need to know if it will at least charge the laptop before I do.


1.5A at 240v is 1.5 * 240 watts ~ 360 watts

This could be 1.5A at 100v which would still be 150 watts so a 75 watt invertor probably wouldn't power it.
#24
Nermal;1837620
1.5A at 240v is 1.5 * 240 watts ~ 360 watts

This could be 1.5A at 100v which would still be 150 watts so a 75 watt invertor probably wouldn't power it.


I think most inverters are around 80% efficient, so with output at 65w, input shouldn't be much more than 80W. Probably the extra is for surge allowance. I think it would be fine, and anyway Tesco offer a good money back policy.
#25
bmouthboyo
AVOID, these items are a joke, your car battery is in no way, shape or form designed to run 240volt appliances and trying to get it to do so will just knacker it. You need a leisure battery with a dedicated wiring for that, not some cheap tat.


This thing will take around 7-8 amps depending on its efficiency. Most car batteries are around 50AH (In my cars at least!) so should run for around 5-7 hours but I would not try that unless as bmouthboyo says you use it in a boat or carvan with a leisure battery. I would use it for short periods only or with the engine running. I will look out in our local Tesco extra today for one as nobody seems to supply in car chargers to fit our mobile phones.
#26
bmouthboyo
AVOID, these items are a joke, your car battery is in no way, shape or form designed to run 240volt appliances and trying to get it to do so will just knacker it. You need a leisure battery with a dedicated wiring for that, not some cheap tat.


It would knacker your car battery just like leaving your lights on and flattening it.

Using one of these normally - whilst the car is running and the battery is being charged by the alternator- will be fine.

Think about it, this is rated at 75w so assuming its not very efficient it'll draw 100w @ 12v its less than leaving your headlights on as they are 2x 55w bulbs.

Oh and most small cars have ~50amp batteries whilst lots of larger cars / diesels have ~100amp batteries and similar sized alternators.
Most heated rear screens draw more than 10amps so it wont be an issue.
#27
Nermal
1.5A at 240v is 1.5 * 240 watts ~ 360 watts

This could be 1.5A at 100v which would still be 150 watts so a 75 watt invertor probably wouldn't power it.


Depends upon a lot of things, including the power factor, using ohms law calculates the VA, not wattage. Unless the power factor is 1, which is unlikely on a switched mode supply even with PFC, the wattage is likely to be less. 1.5A rating is an absolute max/peak. My laptop supply also quotes this, & also quotes an ouput of 19V, 3.16A, around 60W. Switched mode supplies are very efficient, should be at least 80%, so it should fall within 75W.
#28
Leadbeter
This thing will take around 7-8 amps depending on its efficiency. Most car batteries are around 50AH (In my cars at least!) so should run for around 5-7 hours but I would not try that unless as bmouthboyo says you use it in a boat or carvan with a leisure battery. I would use it for short periods only or with the engine running. I will look out in our local Tesco extra today for one as nobody seems to supply in car chargers to fit our mobile phones.


You should never take a battery to less than 50% of it's capacity, so 2.5 - 3.5 hours should be acceptable.
#29
These aren't cheap tat, they are, as I said earlier winner of the Auto EXPRESS inverter test.
#30
Derek_Duval;1837788
You should never take a battery to less than 50% of it's capacity, so 2.5 - 3.5 hours should be acceptable.


And would anyone sit in their car charging their laptop with the engine off for 2.5 - 3.5 hours? I think not. It's more likely that you would leave the laptop charging whilst driving and use the laptop when at a standstill for a relatively small length of time, to catch up on emails between meetings for instance?

Thus the drain on the battery isn't really an issue. It probably wouldn't be wise to leave the laptop charging in the boot for a few hours whilst away from the car because that might risk running the battery flat. But that's common sense isn't it.
#31
Will it power a toaster / kettle etc; if so this would be ideal for cold Boot Fair mornings.
#32
diabeticguy
Will it power a toaster / kettle etc; if so this would be ideal for cold Boot Fair mornings.


Not a chance. Most kettles are 1500w -> 3000w
#33
Not much use for a 75w inverter.
#34
Car batteries are fine stepped up to 220v - the same car batteries produce tens of thousands of volts to fire each spark plug.

The main issue to remember is the relationship...

Power (In watts) = Current (In Amps) x Voltage (in... well you get the hang of it).

When using a cheap invertor to get 220v AC from a 12v DC car battery you lose about 20% of the power to change from DC (which is one side is positive and the other negative) to AC (which varies between positive and negative following a "modified sine wave" which looks like a series of two steps up then two down repeated (or a series of boxes placed above and beneath a line).

Its worth remembering a car cigarette lighter could be rated as low as 7.5A which would be 90W.

Anyone wanting to boil a kettle is best going for dual battery set up - that lets the engine charge two batteries but only let one be used for non car purposes. The invertor needed for this would be quite expensive - and a better bet would be a decent 12v kettle that could run directly from the second battery.

A two battery set up sounds complicated - but its takes longer to plan where to put it than to install - and can be done for under 20 quid with a battery from a breakers. Extra batteries can be added to the second circuit if you are planning to use a lot of power (for camping etc).
banned#35
simate
Not much use for a 75w inverter.


agree voted cold, even my 200watt inverter won't let me run my 130 watt laptop for long off the car or even charge. Had to have the engine running throughout.
#36
Omg. I didn't know you could get these. Thanks, good find!
#37
Still at £20.00 in Tesco Bar Hill Cambs, even asked sales desk.

Anyone seen for £5 in Cambs?
#38
i got a 200 watt inverter off here posted about 3 years ago for £40, long journeys i hate to be a passenger & since purchase - i love it, laptop & 3G...its just like sitting at home :)
#39
My HP laptop adaptor says 65watt on it but when i plugged in the power meter ALDI were selling a while ago it says my laptop is drawing 500watts.
#40
winchman
My HP laptop adaptor says 65watt on it but when i plugged in the power meter ALDI were selling a while ago it says my laptop is drawing 500watts.


500watts! Must be something wrong with the power meter, even my desktop & CRT monitor takes less than half of that.

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