inverter type- modified or pure

is it worth the massive amount of money for a pure 2.5kw+ pure sine wave inverter compared to modified if im using it for heavy duty power tools (big grinder 2kw/drill 1.5kw etc) and computers.
I am completely off grid so solar and wind is my only way in the middle of 16 acres and a large 13.5 ton lorry.

joel0v3sgames said:

is it worth the massive amount of money for a pure 2.5kw+ pure sine wave inverter compared to modified if im using it for heavy duty power tools (big grinder 2kw/drill 1.5kw etc) and computers.
I am completely off grid so solar and wind is my only way in the middle of 16 acres and a large 13.5 ton lorry.

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Why not do both?

Get a small pure-sine inverter for the computer and small loads in your house and a big cheap inverter for the heavy loads?

That way you can run a smaller and more efficient inverter for the loads that might take offence to a dirty power feed (like computers and the usual smaller loads you'd find in a small house) and leave that on all the time, then turn on the bigger one when you need your grinder that most likely don't care what it's being fed as it's using a universal motor that you could even run on DC if you wanted to...

The big inverter is likely to have higher standby losses than a smaller high-quality pure-sine inverter that you would need for your sensitive loads anyway.

I've always heard that modified sine is hard on your appliances, especially including those with motors, compressors, and computers. I wouldn't risk it to save a few dollars, just buy one that puts out a real sine wave.

Computers and anything that converts back to DC will not care in the least for modified sine wave inverter. Motors and compressors are more sensitive.

As said. The computer you can run on almost whatever source.. But other appliances like motors and stuff doesnt really like the modified and will give away strange sounds...

Pure sinewave all the way if you ask me. They arent that much more expensive. Dont forget that a general thumb of law when getting inverters for motors is that a motor can easily take 5-10x surge on startup. So a 1kW motor can easily demand 5kW on startup!!

Yep, I'd go puresine all the way if possible. Any electric motor will run better with puresine vs modified. Kind of think of it as someone pushing on your shoulder. If they are jerky (pulsing) while pushing, it'll feel very uncomfortable. But, if they push smoothly then it won't be so bad.
Another way to look it, and possibly better, is that a modified would be wheels with flat sides, pure would be smooth sides. Modified can be adjusted to have many sides, the more the better. However, there's always a flat side causing disturbance.

Fan motors would really make some annoying sounds while running on modified. Not to mention that it usually takes more current to start using modified, and the motors won't last as long as they get hotter than those running pure.

ok thank you very much, ill go pure sin for the power tools 3KW or 4 and a modified sine wave for heating, lights and anything that converts to dc.