[RE-wrenches] Enphase voltage out of range errors

[penobscotsolar at midmaine.com]

William,
   I should have mentioned that we have two strings of 11 M-215 on the
system I was referring to. The error message we are getting is AC Freq.
Out of Range. Sorry for any confusion.

Daryl


> 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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