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Modified vs pure sine wave inverter

Updated: October 2026

You have a kettle, a drill or a charger that buzzes, and four of the five EDECOA listings in this set are not pure sine. The modified vs pure sine wave inverter choice here is narrow. Modified sine, or the listing's own phrase modified waveform, is what you use for a resistive load that sits well under the continuous rating. Pure sine, in this set, means one listing: the 1,200 W unit. If the plate is higher than that and the load is sensitive, this comparison has no pure-sine answer. The rows and the prices are on the [EDECOA voltage converter comparison](/hub/electrical-equipment/edecoa-voltage-converter). The split below follows those listings and published UK guides. We did not measure a waveform.

You have a kettle, a drill or a charger that buzzes, and four of the five EDECOA listings in this set are not pure sine. The modified vs pure sine wave inverter choice here is narrow.

Our top picks

EDECOA EDECOA 1500W modified inverter

Best overall

EDECOA EDECOA 1500W modified inverter
7.3/10about £99.00
View offer
EDECOA EDECOA 1200W pure sine inverter

Rank 2

EDECOA EDECOA 1200W pure sine inverter
6.0/10about £112.00
View offer
EDECOA EDECOA 3000W 12V inverter

Rank 3

EDECOA EDECOA 3000W 12V inverter
7.6/10about £225.00
View offer
On this page
  1. 1.What this set actually is
  2. 2.Resistive loads
  3. 3.Motors and thyristors
  4. 4.Electronics, CPAP and the one pure-sine listing

What this set actually is

The 1,500 W unit is modified sine, £99.00, 4.2 from 216 reviews. The 2,000 W unit says modified waveform, £168.99, and it has no star line. The 3,000 W 12 V unit is modified sine, £225.00, 4.1 from 103 reviews. The 3,000 W 24 V unit is modified sine, £225.99, 4.2 from 66 reviews. The 1,200 W unit is pure sine, THD under 3 percent claimed, £112.00, 4.2 from 11 reviews. That count is the whole waveform choice. A DPM30 shop cell that says Pure Sine Wave conflicts with that page's modified-sine title, and it does not reclassify the Amazon 3,000 W listings. For an expensive or medical load, follow the stricter source. How to order voltage and watts before this split is on the EDECOA inverter buying guide.

Resistive loads

A kettle element, a heater, a toaster or a simple lamp is the load the modified listings say they are for, within the power the inverter and the battery can hold. Some UK reviews of the 1,500 W unit match a piece of that list: an 800 W kettle, a travel hairdryer, lights. The waveform can be acceptable and the watts can still be the failure. On the 3,000 W 12 V unit, a low-wattage kettle and a toaster ran. Another owner could not run a 2 kW kettle. The 24 V unit ran a kettle in a truck, and one buyer still returned it because a laptop and a television were too noisy. The 2,000 W listing calls occasional electrical noise the trade-off for modified waveform.
EDECOA EDECOA 1500W modified inverter

Testsieger

EDECOA EDECOA 1500W modified inverter
7.3/10about £99.00
View offer

Motors and thyristors

Willgen moves brushless motors to pure sine. 12 Volt Planet names thyristor controls, as in some bread makers and washing machines, as the exception that needs pure sine. A drill is not automatically that class. On the 2,000 W unit a power drill would not run, and a microwave did not like the output. On the 1,500 W unit a 1,200 W grinder did not run. On the 3,000 W 12 V unit a 750 W microwave ran for one owner, and a 2,200 W washing machine did not run for others. On the pure-sine unit a 700 W angle grinder ran, and a vacuum was a struggle. If the plate is over 1,200 W, pure sine in this set is not available.

Electronics, CPAP and the one pure-sine listing

Laptop chargers, televisions and CPAP machines are where the guides diverge. The Camping and Caravanning Club names pure sine for a CPAP, and says a vital machine needs a hook-up or a generator, not an inverter alone. One review of the 1,500 W unit says a sleep-apnoea machine ran overnight. That is one review, not a clearance. When you want pure sine inside this set, the listing is the 1,200 W unit at £112.00, 4.2 from 11 reviews. Claimed THD under 3 percent is a listing line. If the plate is a 2,000 W heater, do not buy this unit for that heater. Who should skip a listing is on best EDECOA inverter UK.

Common questions

What is the difference in one sentence?
Modified sine, including the modified waveform wording on the 2,000 W listing, is a stepped output the listings aim at resistive loads. Pure sine is the mains-shaped output, and in this set only the 1,200 W unit claims it, at 1,200 W continuous and a stated THD under 3 percent.
Will a kettle run on the modified listings?
A kettle can, when it is resistive and the continuous watts, the battery and the cable all hold. Reviews include an 800 W kettle on the 1,500 W unit for some owners, a low-wattage kettle on the 3,000 W 12 V unit, and a kettle in a truck on the 24 V unit.
Why do some pages allow a laptop and others do not?
Because the guides do not share one appliance list. 12 Volt Planet is willing to put a lot of ordinary equipment on modified sine and saves the warning for thyristor controls.
Is there a pure-sine EDECOA above 1,200 W in this set?
No. The 1,200 W unit is the only pure-sine listing kept here, at 2,400 W peak, £112.00 and 4.2 from 11 reviews.
Does the 3,000 W Amazon listing become pure sine because the DPM30 table says so?
No. The DPM30 page is a manufacturer table whose title is modified sine and whose cells also say Pure Sine Wave and THD under 26 percent.
What about a washing machine or a drill?
A drill is a motor, and the reviews split. A power drill failed on the 2,000 W unit, a 1,200 W grinder failed on the 1,500 W unit, and a 700 W angle grinder ran on the pure-sine unit.
A review says a sleep-apnoea machine ran. Is that enough?
No. One owner ran one overnight on the 1,500 W modified unit. The Camping and Caravanning Club still names pure sine for a CPAP, and says not to rely on an inverter alone if the device is vital.

Related pages

EDECOA voltage converter for a motorhome

EDECOA voltage converter

Best EDECOA inverter UK inside this five-listing set

EDECOA inverter buying guide: voltage before watts

How to install an EDECOA inverter beside the battery

Sources

Public UK sources from the research digest, last checked on 20 October 2026. Shelf prices and star lines are the amazon.co.uk figures in the display file. The 2,000 W listing has no Customer Reviews star line.

  1. Camping and Caravanning Club: a guide to inverters (retrieved 20 October 2026)
  2. Camping and Caravanning Club: campsite electricity (retrieved 20 October 2026)
  3. GOV.UK: Electrical Equipment (Safety) Regulations 2016 (retrieved 20 October 2026)
  4. ESQCR 2002, regulation 27 (retrieved 20 October 2026)
  5. IET: electrical installations in caravan camping parks, caravans and motor caravans (retrieved 20 October 2026)
  6. 12 Volt Planet: modified sine wave inverters (retrieved 20 October 2026)
  7. Willgen: modified sinewave inverters (retrieved 20 October 2026)
  8. EDECOA DPM30 3000 W modified sine inverter (retrieved 20 October 2026)