[RE-wrenches] Solectria TL woes

[Jeff Irish, PE]

Andrew, I've seen this in multiple inverter systems when the AC voltage
gets pushed outside the upper limit by the inverter output currents.  One
or two inverters will cycle on-off, those with the lowest setting or
tolerance.  Cause can be (1) high AC voltage from the utility to start
with, and/or (2) high impedance looking into the grid from the inverters,
usually from an undersized or loose service conductor.
Jeff

On Tue, Feb 25, 2020 at 3:16 PM Jerry Shafer <jerrysgarage01 at gmail.com>
wrote:

> Andrew
> What is the AC Voltage when this occurs, to much VAC will shut down the
> inverter. It also looks like you are clipping all the inverters during the
> mid day, is due to low temps or does this always happen. What is the DC
> MPPT voltage, is it at the upper limit.
> Jerry
> NABCEP PV inspector
>
> On Tue, Feb 25, 2020, 12:02 PM Andrew Truitt <atruitt at gmail.com> wrote:
>
>>
>> Wrenches,
>>
>> I have a couple of Solectria 36TLs at a small community solar site in CO
>> that shut themselves down occasionally for what appears to be no reason.
>>
>> [image: image.png]
>>
>> Voltages and frequency are normal, firmware is updated, IR scan shows
>> nothing irregular, and the other 2 inverters at the site (50TLs) are fine.
>> It can happen under sunny or cloudy conditions.  Solectria will RMA the
>> inverters but before I go out and replace I'm curious if anyone has seen
>> this behavior?
>>
>>
>> Regards,
>>
>> Andrew Truitt
>>
>> www.dr.ventures
>> d: 202.486.7507
>>
>> NABCEP Certified PV Installation Professional ID: 032407-66
>> Colorado Journeyman Electrician License No.: 600132
>>
>> <https://www.linkedin.com/in/andrewtruitt/>
>>
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-- 

Jeff Irish, PE
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