[RE-wrenches] Enphase voltage out of range errors

[Bill Hoffer]

William

Double check your voltage drop on the AC branch circuits, and make sure
that you consider your wiring between inverters.  Remember that voltage
drop is additive and each inverter will see a slightly lower voltage drop
which could account for the voltage over error, especially if you are
seeing it at the end of the string.  Enphase does have a white paper on
that and they are now recommending splitting long strings int he middle to
make to branch circuits out of one now to alleviate this problem.  The
White Paper explains this in more detail.  There was also a Solar Pro
article describing how voltage drop can result in voltage rise at the
inverter, and I have seen and measured this with a meter.  Maybe the
inverters are correctly reporting the voltage rise?

Bill

On Mon, Nov 26, 2012 at 12:46 PM, William Miller <william at millersolar.com>wrote:

> Friends:
>
> We have one site that is experiencing ongoing problems with errors
> indicating, "AC Voltage Out Of Range."  This has occurred on two of 17 M190
> inverters.  Apparently the voltage is not really out of range, the inverter
> is erroneously reporting.
>
> I have one replacement in hand and was just about to drive the 2 hours to
> replace it when another inverter indicated the same problem.  I ordered a
> second replacement.
>
> I fear that soon after I return to my shop from the job I will see another
> inverter with this problem.  Has anyone else experienced this error?
>
> Thanks in advance,
>
> William
>
> Miller Solar
> Voice :805-438-5600
> email: william at millersolar.com
> http://millersolar.com
> License No. C-10-773985
>
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-- 
Bill Hoffer PE
NABCEP Certified Solar PV Installer™
Sunergy Engineering Services PLLC
2504 Columbia Ave NW
East Wenatchee WA 98802-3941
bhoffer at sunergyengineeringservices.com Cell:(509)679-6165
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