[Yannick99]

Yes I saw the spec on their website. Looks like the generator part of T08072 is almost 2x better than P08008 for THD. It's why I asked I have doubt on this.
Thanks for your input

 

[Yannick99]

Problem is I'll buy it for my house, including electronic device such as computers. In fact I already bought the p08008 but the box is still not open. I'm thinking of return it to take the 11-14% thd instead. Those computers are all connected throw a UPS but I dont know how those UPS will react with 25% THD

 

[Yannick99]

I have a APC Smart UPS 1400 and a Smart ups 750. Like you said, if THD is too high and switch on battery anyway, this doesn't help me at all. Best way should do to try it to see what is really going. on.

 

[Yannick99]

Ok more clear now. Wrong voltage and frequency is what ups doesn't like. THD is less important that I thought.

To adjust the frequency---> motor speed. Something like that:

And for voltage---->something like that:

In addition, for the THD, all pc's are switching power supply. Meaning they are first filtered and rectified to DC and raise to about 400v dc, and switching it in a transformer as square wave (already noisy). And re-lower down at acceptable voltage with higher current, again, filtered. Knowing this. I agree that THD isn't the worst problem for electronic.

So, turn off the main breaker, start the generator, be sure voltage and frequency is on spec. When all is looking good, turn on the generator breaker.
Thank you for your advice et your time very appreciated.

Yannick