[RE-wrenches] Grid overvoltage and undervoltage issues on SMA install

[Jerry Shafer]

Wrenches
Looks like the i verter is doing what it should 269 is out of range, what
is the at meter voltage, libe loss or very high output voltage, 41 volts
increase looks like resistance issues. More info would help, distance, wire
size etc.
Jerry
Jerry


On Thu, May 20, 2021, 9:52 AM James Reismiller <james at abundantsolar.com>
wrote:

> Hi Folks,
>
> I’m wondering if anybody has ideas on what could be causing grid
> over/undervoltage errors on an install we did about a year ago that now has
> these issues. The site is a 24 kW DC ground mount array with (3) SMA
> SB7.0-1SP-US-40 inverters. I’ve checked and done the following:
>
>    1. Measured voltage min/max at inverter terminals and AC combiner. Min
>    – 228VAC (with no inverter output) Max - 269 VAC (when inverter trying to
>    connect)!
>    2. Had utility check service and transformer with load meter (with no
>    PV running). No issues found and utility engineer stated he thinks it’s on
>    our side.
>    3. Checked all AC connections including neutral (seemed like neutral
>    issue) from inverters back to supply-side tap (fused disco).
>    4. Changed SMA upper voltage window in grid guard settings to 272V max
>    and 264V reconnection. This helped for a while but now is faulting again.
>
>
>
> Have any of you ran into this issue and how did you solve it? Or what’s
> the next thing to check?
>
>
>
> Thanks in advance!
>
>
>
> Be Well,
>
> James Reismiller
>
> He/Him/His
>
> NABCEP Certified Solar PV Installer®
>
> Abundant Solar
>
> 541-231-8072  xt. 3
>
> CCB#175919
>
> www.abundantsolar.com
> <http://www.abundantsolar.com/abundantsolar/Home.html>
>
>
>
> "Don't get me wrong: I love nuclear energy! It's just that I prefer fusion
> to fission. And it just so happens that there's an enormous fusion reactor
> safely banked a few million miles from us. It delivers more than we could
> ever use in just about 8 minutes. And it's wireless!"
>
>
>
> ~William McDonough
>
>
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