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Something like this:

Pure sine wave inverters are getting cheaper.

What is interesting about the pure sine wave inverter you posted, there is a list of things that are appropriate for pure sine wave vs modified sine wave inverters:
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What is interesting, is that there are many things that shouldn't be powered by a modified sine wave inverter according to the manufacture. This is the same manufacture of the modified sine wave inverter that the OP is using.

I would argue that some of those items would be fine with a modified sine wave inverter, such as the phones, laptops, and batteries.

The TV and stereo would probably be fine, except I personally noticed that using a modified sine wave inverter with anything with speakers that is AC powered an annoying hum plays over the speakers.
 
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Pure sine wave inverters are getting cheaper.

What is interesting about the pure sine wave inverter you posted, there is a list of things that are appropriate for pure sine wave vs modified sine wave inverters:
View attachment 889155
What is interesting, is that there are many things that shouldn't be powered by a modified sine wave inverter according to the manufacture. This is the same manufacture of the modified sine wave inverter that the OP is using.

I would argue that some of those items would be fine with a modified sine wave inverter, such as the phones, laptops, and batteries.

The TV and stereo would probably be fine, except I personally noticed that using a modified sine wave inverter with anything with speakers that is AC powered an annoying hum plays over the speakers.

Years ago one of the IEEE publications (AFAIR) had an investigation of inverters and what they can do to certain power supplies. The square wave inverters were suspected of damaging 'weak' power supplies. *shrug* I just wouldn't use an inverter. As I said, I have a factory inverter in my car, and have never actually used it.
 
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A modified sine wave inverter is not going to cause any problems to your phone or laptop. There are issues you have to be careful with these cheaper inverters but they are mainly with running devices with motors etc. I agree its not what i would chose to do since its not terrible efficient However, I see no problem where you are using it to power a device which is going to basically convert the AC back to DC using some sort of rectifier. The way AC to DC devices work is that they Flip the bottom half of the sine way to positive and then set about smoothing it out to be as close to pure DC as possible. Little difference at this point with Pure sine wave or blocky wave. If there was a risk with this type of technology then switching power suppliers would never be so popular.
 
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