1 Agreed. However, I find this discussion at this link a bit... alarming.
( https://www.solarpaneltalk.com/forum...ithlostphase )
The installation consists of 4SMA Tripower 20000TL inverters with a load side connection via a 480/208 YY 100kW transformer to the MDP. The inverters are 3 phase 277/480 and the grid is 3 phase 120/208.
2 Right, the pdf is about connecting to MV, but it doesn't explain the why re: 90% at all, and I can't find a pdf about stepping down.
3 Delta and wye are the same in Germany....but the grid isn't...so...who knows?
4 Pretty sure there's a post on this forum about that somewhere.
5 Do you think the loads or the inverters are more important, if picking one of A,B,C?
Inverters aren't technically computers....or?
The grid doesn't like harmonics, so get a harmonic mitigating model makes sense to me.
A Energy efficient kfactor transformer designed to tolerate heating due to harmonics associated with nonlinear loads.

B Harmonic mitigating transformers are superior to KRated and conventional transformers in reducing voltage distortion (flattopping) and power losses due to current harmonics created by singlephase, nonlinear loads such as computer equipment.

C These energy efficient general purpose transformers are designed for linear loads and are most frequently used for applications such as commercial buildings which will supply a variety of general loads.
http://www.temcoindustrialpower.com/...05160&n=ACAg.p
6 I really don't know maybe the impedance increases with a xfmr running at 98%, and it bothers the inverters somehow?
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