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Maplin 12V Modified Sinewave 1000W Inverter

Code: A12HQ

Maplin 12V Modified Sinewave 1000W Inverter is rated 4.1 out of 5 by 7.
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  • 1000W continuous output to power a range of household appliances
  • Modified sinewave output
  • Two 240VAC mains sockets to power products without additional converters

Product details

Maplin 12V Modified Sinewave 1000W Inverter

• 1000W continuous output to power a range of household appliances
• Modified sinewave output
• Two 240VAC mains sockets to power products without additional converters
• 12VDC power from two alligator clips connected directly to the battery
• Weighing in at 4.15kg, the rugged metal design (300 x 198 x 80 mm) is mountable so that it can be positioned without becoming an obstruction
• Shutdown protection against power overload

What is an inverter?
An inverter is a converter that connects to a sealed lead acid (SLA) battery that is usually connected to a car, a truck or a solar panel. The inverter can connect to the battery either through a car accessory plug or by clipping directly to the battery. A mains powered device can then be plugged directly into the inverter’s AC socket. Inverters vary in capacity and can power devices of up to a specific wattage. Inverters can be split into two categories: pure sinewave and modified sinewave.

What makes this inverter unique?
This Maplin inverter connects to the car battery directly with alligator clips and can be mounted in a suitable position without being obstructive. The inverter can power several products at the same time up to a combined maximum of 1000W, such as a television, an induction hob or a laptop, making this inverter ideal in a camper or while out camping. It is highly efficient, converting over 85% of its energy into output power. The inverter includes shutdown protection to power down the inverter if the battery power drops below a certain level.

What is the difference between pure sinewave and modified sinewave?
All household mains sockets output a sinewave along the cable to transfer power from the source, such as the battery or plug to the product that is plugged in. This product is a modified sinewave inverter which produces a stepped approximation of a pure sinewave inverter which makes it easier to produce. A modified sinewave inverter can power devices such as laptops, printers and chargers, although some items may pick up interference from the inverter. A solution for this is to upgrade to a pure sinewave inverter. A pure sinewave inverter is used to power sensitive electronic devices such as power motors, power tools, clocks or microwaves.

Connector Battery clips
Cable length
Input voltage range 12 V
Standby input current: <0.7 A
Output voltage: 240 V ± 5%
Output frequency: 50 Hz
Output power: 1000 W
Peak output power: 2400 W
Output waveform MSW
Efficiency 85% - 90 %
Dimensions 300 x 198 x 80 mm
Weight 4150 g
USB output N/A
Low battery protection YES
Shutdown protection YES
Rated 4 out of 5 by from Back-up Power for freezer I bought this to provide back-up power to my 2 upright freezers using a car battery in case of failure in the mains supply. I tried two 600W inverters first but they would not take the continuous load on either freezer, let alone the peak load when the compressors switches on. This one seems to run at least one freezer no problem but I sense it will struggle with 2 if they both try to run their compressors at the same time. Hope I never have to find out! Only gripe is that it comes with ring battery connectors, not crocodile clips like the 600w inverters. I now have to buy adapters for my battery terminals, which Maplin don't sell.
Date published: 2014-02-02
Rated 5 out of 5 by from bought one of these last year ,very good bit of kit ,i have wired it directly to 2 110 amp leisure batterys on my motorhome so i can run a laptop, freesat box etc ,it has never run down my batteries even when using the laptop for 2-3 hrs. The remote control is worth every penny as it saves time having to switch the invertor off at the unit.
Date published: 2010-06-30
Rated 4 out of 5 by from Caution Modified Sine Wave inverters produce square wave outputs which have a poor power factor due to the current and voltage not being in phase with each other. This waveform can damage some electric motors, such as compressors on fridges and freezers, and will be expensive to repair. That's why Pure Sine wave inverters are produced, but they are more expensive. Modified sine wave inverters are ok for use with electrical devices that use an external switch mode power module, such as are provided with most lap top PC's and some TV's.
Date published: 2014-06-08
Rated 5 out of 5 by from Impressive piece of equipment Very impressed with this. I use it in my motorhome, running off of 2 110 amp hour leisure batteries, to power the TV and my wife's hair-dryer. (V. important!) It's slightly smaller that my previous unit, very quiet running and will power the hair-dryer on full power setting, something my previous unit, allegedly 1000w, would only run at half power. A previous reviewer complained that the leads didn't have crocodile clips at the ends. I hope he didn't change the ring terminals because if you're handling 80 amps plus in the input circuit, you really do need a good connection with the battery. Only disconcerting issue is when you switch the unit on, all three lights, normal, heat overload and power overload, light up and there's no output, but after three seconds, the overload lights go out and you have output. In all, it does what it says on the box, if not the tin!
Date published: 2014-03-18
Rated 5 out of 5 by from Keeps my office going Good solid unit. With a 100Ah battery it powers my laptop, desk VoIP phone, router and wireless extender during 2-hour power cuts. Nice long leads so you can put the battery somewhere safe. Ring terminals don't fit the battery posts, but cut them off and replaced with WD1R clip-ons.
Date published: 2014-03-21
Rated 5 out of 5 by from Brill piece of kit and even better with the remote switch! Highly recommended purchase.
Date published: 2011-03-23
Rated 1 out of 5 by from This is total rubbish bought it to charge batteries for cordless drill every time I plugged it in it trips out
Date published: 2013-11-16
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Will this power and charge a mobility scooter&nbsp;

Asked by: Marian
NO ... this is not a battery charger.
Answered by: Les
Date published: 2017-06-08

Does the car Engine need to be running when using this in a vans 12v leisure battery?

Asked by: Jjwren56
It would depend on how the accessory socket is wired. As long as power can be drawn from the battery without the engine then no, this should still work. If the accessory socket is linked to the engine and isolated when the engine is off, then the inverter would stop working with the engine off.
Answered by: Gareth
Date published: 2017-05-22

Can you run the full current through one socket? I ask as photo shows two 240v sockets. May be there is some circiut that splits the current between the two sockets. thank you.&nbsp;

Asked by: knockmzn
You can run the full current through one socket. however if you want to use both sockets at a lower current that would be possible too
Answered by: Dale
Date published: 2017-05-15

On testing the fitted unit the overload light comes on very very briefly then just the green normal light stays on. 240 volt power appears to be produced. After 5 to 7 seconds a high pitched continuous beep starts and carries on till cut off occurs. Help

Asked by: Mervyn
This service is for frequently asked questions and does not allow two way communication, In order for us to best assist you with your technical issue please contact us on the details below: 0333 400 9500 or email
Answered by: Dominic
Date published: 2017-04-27

would this inverter power a 900watt halogen heater

Asked by: johnt
As long as the item does not draw more than 1000w then it will be fine.
Answered by: Billy
Date published: 2017-04-11

Would this item be ok to power a small convector heater at 500watt on a fibreglass Cruiser with two 110amp domestic Batteries without running the outboard engine?

Asked by: Bridgey 25
Unfortunately i am sorry but the item in question doesn't support use in you intended application.
Answered by: darren cordon
Date published: 2017-03-26

What size invertor do I need to power a 550w slow juicer and a 550w blender separately.

Asked by: Laurie
if you are using them at the same time, you would need an inverter over 1100W, If you are using them apart from each other, you need any inverter over 550W
Answered by: Dale
Date published: 2017-03-22

I recently purchased one of these but there was some paperwork missing from the instructions. I want to switch it on via the ignition is this possible and where can I find the data sheets

Asked by: Phil
This size of inverter needs to be wired to the battery, and would not be able to go via the ignition.
Answered by: Russell
Date published: 2017-03-14
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Bulk Prices

Item code Item name Quantity Price
A12HQ Maplin 12V Modified Sinewave 1000W Inverter (1+) £119.99

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