INVERTER

[Middy42]

Afternoon all, will a pure sine wave boil a kettle faster than the modified one if both same power. Barrie

 

[Boringfrog]

Would say the same, but I wouldn't recommend it.

 

[tacr2man]

Pure sine is more efficient. The best example is with boiling 1 cup of water in a microwave: on a pure sine it takes 1 minute, on a modified sine it takes 2. Using less energy means you can use more devices, or save money by installing less solar or batteries.
https://www.gonewiththewynns.com/rv-inverter-pure-sine

 

[MichaelT]

For boiling a kettle use your gas hob and kettle to suit.

 

[Guigsy]

I considered whether I should boost my battery and inverter to run things like the kettle. I decided that a kettle to put on the gas hob was both lighter and more dependable.

I know sine wave inverters are better for some electricals (like things with motors) and they are more efficient, but I didn't think it was twice as efficient. The type of inverter also doesn't matter to most modern electronics because their power supplies are switch-mode and don't even care what the voltage is. I'm pretty sure a kettle isn't going to care either.

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[hilldweller]

Afternoon all, will a pure sine wave boil a kettle faster than the modified one if both same power. Barrie

Both the same except the tea always tastes so much better with pure sine wave, it has a bitter edge from a square wave which is of course pretty obvious when you think about it.

 

[pappajohn]

Both the same except the tea always tastes so much better with pure sine wave, it has a bitter edge from a square wave which is of course pretty obvious when you think about it.

Stop winding them up you bugger.

 

[pappajohn]

To produce heat, IE: a kettle, it won't make any difference but as already said its far more efficient to use gas and a whistling Billy kettle.

 

[Ivory55]

The only people I know who use An inverter to boil a kettle are truck drivers, because their boss won’t let them have gas rings in the cab but they leave their engine running as it’s not their diesel.

 

[canopus]

You'll want a hefty bank of batteries and and a sizeable inverter if you want to boil kettles. Use gas as suggested.

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[GPW]

Afternoon all, will a pure sine wave boil a kettle faster than the modified one if both same power. Barrie

Avoid 'modified sine wave', it's basically a square wave because it's cheap to make but contains an enormous amount of odd-order harmonics which will overload and overheat most gadgets when connected, especially transformers. Nothing is likely to work properly plugged into a modified wave inverter.

Once it's ruined all your stuff you'll have to buy a decent one anyway, so why bother?

If you want enough mains to boil a 2.2kW kettle on board and to have the batteries last more then six months you'll be needing around 900Ah of battery and £900 worth of inverter charger.

To calculate the current draw take the power and divide it by 12. E.g. 2200 W / 12 = 183 A, then lookup how long your battery will last when subjected to that current draw. I'd also go for wet lead-acid for that current because the cooling is better (as the acid circulates). Also only use an inverter or inverter charger that has a battery temperature sensor on it for safety and battery life.

 

[two]

Why do you ask, Barrie? I'm not sure you've asked the right question.
For simple kettle heating I don't think it'd make much difference what shape of waveform is used, once it's reached the kettle, but some inverters are much more efficient (and expensive) than others.
The better answer is "Don't even go there." Gas is the best way to go.

 

[Diabalo]

Buy a 12V kettle and cut out the inverter.

 

[GPW]

Buy a 12V kettle and cut out the inverter.

I was looking into a way for power a 1kW DeLonghi coffee maker in a small van, after going around the houses and pricing up ways to do it 'properly' I eventually settled on a £15 gas stove and a small cafetiere I already had. .