Ring Automotive RINVU500 12V Modified Sinewave 400W Inverter

Price match guranteePrice match guarantee

We can price match this item if found elsewhere. Call us on:

0333 400 9500

Quoting product code: A04TR


About this product


  • 400W continuous output to power a range of common household appliances
  • Modified sinewave output
  • 240Vac output to power a product without additional converters

Product overview

• 400W continuous output to power a range of common household appliances
• Modified sinewave output
• 240Vac output to power a product without additional converters
• 12Vdc battery clips that connect directly to your battery to power the inverter
• Weighs only 1280g and its compact design (196mm x 225m x 75mm) prevents it getting in the way
• 2.1A USB connector to charge an additional device such as a Smartphone or Tablet

Special Feature
• Shutdown protection against 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?
The RINVU500 inverter connects directly to the car battery with battery clips and its compact design allows it to be positioned out of the way. The long power cable can be secured into the foot well to prevent it becoming tangled. The inverter can power a device up to 400W, such as a laptop, a small monitor or a phone charger. It is highly efficient, converting 90% of its energy supply into output power. The fitted 2.1A USB socket allows you to charge a wide range of items such as a smartphone or tablet while keeping the mains socket available to power an additional item such as a small television. The inverter also 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, such as A71JW. 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 Not Specified
Input voltage range 12 V
Standby input current: 0.3 A
Output voltage: AC 240 V
Output frequency: 50 Hz
Output power: 400 W Continuous
Peak output power: 1000 W
Output waveform MSW
Efficiency 90%
Dimensions 196mm x 225m x 75mm
Weight 1280 g
USB output 2.1 A
Low battery protection Yes
Shutdown protection Yes

Would this run off a car cigarette lighter socket and power  a house kettle 

Asked by: stupot1
Yes this will work fine in your intended application.
Answered by: Darren
Date published: 2015-11-25

Hi, would this operate a small caravan microwave, and if so what is the drain on the car battery like for short bouts of usage? Cheers

Asked by: EstelleB
If the item is less then 500W yes - we would need to know the wattage to give you any idea of drain.
Answered by: Dominic
Date published: 2015-08-30

Hi does this supply a power supply smooth enough to operate a computer projector of 300 watts without any visual shimmer 

Asked by: Paulne99
No for this you would need pure sinewave.
Answered by: Dominic
Date published: 2015-07-17

what is the input current (12 volt side). 

Asked by: Marky
This would be about 41.66A at full load.
Answered by: Dominic
Date published: 2015-07-17

Hi will this item run a small flat screen TV and Xbox 1 

Asked by: Simon2996
The inverter supplies 500w of power - if your TV and console use a total wattage less then 500 then this item will be suitable.
Answered by: DaveB
Date published: 2015-07-17

Hi I'm looking to power a 250watt bass amp for street busking. The choices I have are inverter generator or inverter from a 12v battery. Which of the ring 12v inverters would you recommend for such usage and what power time could I expect? I'm on a budget

Asked by: Brewster
It would depend on the amp hour rating of your battery. If you email us your specific details to technical@maplin.co.uk and we can advise further.
Answered by: DaveB
Date published: 2015-07-17

I want to use inverter connected to a boat battery. Can I connect a 12v battery charger to inverter via the 240v socket to charge a spare battery whilst engine is charging boat battery. If yes can I also connect inverter to battery via 12v cigar plug

Asked by: mick
This will run items that use up to 500w if the charger is below this wattage it will work, This can't be run from the 12v plug as it can't take this kind of wattage and has to be run direct from the battery.
Answered by: Dominic
Date published: 2015-07-17
  • y_2018, m_1, d_21, h_6CST
  • bvseo_bulk, prod_bvqa, vn_bulk_2.0.6
  • cp_1, bvpage1
  • co_hasquestionsanswers, tq_7
  • loc_en_GB, sid_A04TR, prod, sort_[SortEntry(order=LAST_APPROVED_ANSWER_SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_maplin-en_gb