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Maplin 12V Pure Sinewave 300W Inverter


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About this product


  • 300W continuous output
  • Pure sinewave output keeps your appliances safe and can power a TV, laptop, microwave and more
  • 240VAC mains socket to power a product without additional converters

Product overview

• 300W continuous output
• Pure sinewave output keeps your appliances safe and can power a TV, laptop, microwave and more
• 240VAC mains socket to power a product without additional converters
• 12VDC input using the car accessory socket or included alligator clips
• Weighing only 1.3kg and its compact design (245 x 117 x 62mm) prevents it getting in the way

Power your devices from a truck, car or solar panel

This Maplin 12V 300W 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.

Highly compact and safe to use
This Maplin 12V 300W inverter connects to the car battery using the car accessory socket or the included alligator clips. Its compact design allows you to place the inverter where it is needed without it becoming a hazard. The inverter can power a device up to 300W such as a laptop, a phone charger or a portable games console. It is highly efficient, converting over 85% of its energy into output power. This 12V inverter includes shutdown protection to power down the inverter if the battery power drops below a certain level.

Power your every day appliances
A pure sinewave inverter can power electronics such as motors, power tools or clocks, including products with more sensitive component parts. Unlike a modified sinewave inverter, there will be no electrical interference. This 12V pure sinewave inverter improves a user’s experience with this type of product.


Rated 5 out of 5 by from The manufacturer advised that the inverter on/off switch cuts off the 12v battery input so you don't have to worry about standby draining the battery when off. I have only tried this with a total load off 120 watts being a 32 inch LED TV + 2 x 11watt low energy lamps and a pond pump. The output was rock steady at 231volts & 49.5 hz.
Date published: 2014-11-11
Rated 5 out of 5 by from Does what it says on the tin Happliy runs Flat screen TV, Laptop and playstation at the same time.
Date published: 2014-11-11
Rated 3 out of 5 by from A spare fuse is provided in the box, trouble is, it is the wrong type being a glass tube type not the spade automotive type required. Only one fuse supplied, but as two fuses fitted are wired in parrallel, if fault or wrong polarity input applied, both fuses will 'blow' and 2 replacements will be required. It does however, do what it says on the box. I would have rated 6 stars if it had 2 spare fuse of the correct type and instructions of how to open up to replace them. (Take 2 bottom screws out at each end, base comes off).
Date published: 2014-11-11
Rated 4 out of 5 by from This is the only type of inverter to buy if you want to power inductive loads like central heating pumps. This inverter gives a very stable 230v at a rock steady 50 hz. Really good value for money from Maplin.
Date published: 2014-11-11
Rated 4 out of 5 by from Works great! Slight buzz Iv been using the inverter to convert battery power for a PA system. Usually have it running 2-4 hours at a time. Has worked fine for me. My only criticism is that I have a low level electronic buzz coming out of the pa that ideally would not be there. Unable to pin it down to only the inverter but I'd assume it is the culprit as the only other components are the batteries. Other than that it's great!
Date published: 2016-08-18
Rated 5 out of 5 by from 12v Pure Sine Inverter - Easy to use Purchased this for recharging lip batteries whilst between jobs. Powered from internal car socket, easy to set up and use and battery charged in a similar time to conventional charging.
Date published: 2016-06-23
Rated 5 out of 5 by from This item was a replacement due to initial order damaged prior to dispatch The replacement came per return and no damage Good service and delivery Very pleased
Date published: 2017-01-16
Rated 5 out of 5 by from Perfect unit Bought this unit on the advice of the tech guys at Maplins to charge and run my wife's oxygen machine, works a treat, big thank you.
Date published: 2017-05-18
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300W Pure Sinewave Inverter

Sinewave Type:

Pure Sinewave

Operating Specifications

Output Power:


Peak Output Power:


Input Voltage:


Input Current:


Output Voltage:


Output Frequency:


Dimensions & Weight










Cable Length:


Product Specifications

Low Battery Protection:


I've been using this product for over a year and its great! However, I now have the need for a longer 12VDC input, is there such a thing sold separately?

Asked by: Sam P
On this occasion Maplin do not stock a product that exactly meets your requirements, or indeed anything close enough to offer you as an alternative.
Answered by: Neil G
Date published: 2018-01-18

What is the energy efficiency and no load current draw of this inverter

Asked by: Simonsie
Unfortunately this information has not been provided by the manufacture
Answered by: Brad
Date published: 2017-11-21

can I plug 3 socket extension lead into the inverter plug socket to power 3 items at the same time?

Asked by: trevor
You would be better off plugging a power surge protector extension into the inverter. This would significantly reduce the likelihood of damage when starting up or shutting down
Answered by: Simonsie
Date published: 2017-10-27

Has this product been approved to ECE R10? If yes, could you please email a copy of the approval.

Asked by: Dave
No, I am sorry but the item has no ECE R10.
Answered by: Dominic
Date published: 2017-08-11

What size dc cables are supplied with this device as a 300 watt inverter running at 300w will demand a current of 25Amps. No cigar lighter socket could cope with that and the croc clip cables look too small? Fire in the offing?

Asked by: Cornish chewey
The cables supplied work fine with the item. Unfortunately, the size of the cable is not included in the specifications.
Answered by: Dominic
Date published: 2017-04-24

Can I use a solar panel to recharge? 

Asked by: Tintin30
This inverter draws it's power from a 12v battery. (typically a car, solar or leisure battery). It is possible to use a solar panel to recharge the battery that you are using, but the inverter itself does not have anything that can be "recharged"
Answered by: Les
Date published: 2016-11-16

Does this give full output when plugged into the 12v socket in the car or just when connected directly to the battery?

Asked by: Andrew1989
Yes, I am pleased to advise the item will support this use.
Answered by: Dominic
Date published: 2016-11-07

I have bought one of these and would like to know what the different beeps mean as it does not explain in the manual. Whilst using my laptop it has started making a long constant beep but does not cut out. What does this mean?

Asked by: Thomas
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 9757 or email technical@maplin.co.uk
Answered by: Dale
Date published: 2016-09-08
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