[RE-wrenches] Enphase M190 current limiting

Louis Woofenden louis at woofenden.net
Wed Feb 3 08:48:02 PST 2016


Hi Rebecca and all,

We're experiencing the same thing on several M190 sites, though not all. 
Interestingly, M190s that have been replaced are not having the same 
problem.

According to Enphase, it is a software problem. My understanding is that 
they are rolling back software updates on affected devices to solve the 
problem, but I'm not clear on the exact order that will happen.

Not sure if being a squeaky wheel on particular systems is going to hurt 
or help. Kind of disappointing that they didn't properly beta test any 
software updates on all types of microinverter devices before rolling 
them out to all customers. Seems like that would be common sense.

Best,
Louis

--
Louis Woofenden
Engineering Director
Net Zero Solar, LLC
101. W. 5th St., Tucson, AZ 85705
Arizona ROC #248710, 259756, 259521

Phone:520.207.4053 <tel:520.207.4053>Ex. 2
Cell:520.237.5040 <tel:520.237.5040>
Fax:520.203.7230 <tel:520.203.7230>

NABCEP Certified PV Installation Professional™
NABCEP Certified Solar Heating Installer™


Luke Christy wrote:
> Hi Rebecca,
> After you posted this I looked at the power production history for 
> several of our Enphase sites with M190s, and the same thing is 
> happening. Inverter output is being clipped at 140W across the board.
> This seems like a pretty big deal in terms of potential lost 
> production for a lot of users.
>
> Have you brought this up with Enphase?
>
> -Luke
>
>
>
> NABCEP Certified PV Installation Professional™: Certification #031409-25
> NABCEP Certified Solar Heating Installer™: Certification #ST032611-03
> CoSEIA Certified PV Installer
>
> Solar Gain Services, LLC
> PO Box 531
> Monte Vista, CO 81144
> sgsrenewables at gmail.com <mailto:sgsrenewables at gmail.com>
> 719.588.3044
> www.sgsrenewables.com <http://www.sgsrenewables.com/>
>
> On Jan 31, 2016, at 21:08, Rebecca Lundberg 
> <rebecca.lundberg at powerfullygreen.com 
> <mailto:rebecca.lundberg at powerfullygreen.com>> wrote:
>
>> I just noticed that several of our sites with Enphase M190s are 
>> current limiting at 140 watts. These units used to clip at 199 watts 
>> so I feel like our customers just lost a potential 30% of their power 
>> output. It appears to be related to a firmware update 
>> 520-00008-r01-v01.08.00. We've got one site with just 8 units, 1 of 
>> them got this firmware update back in September and has been limiting 
>> to 140w since then, 5 of them got this update in late January and 
>> have been limiting to 140w since then, the other two are at a 
>> previous firmware version and are performing as we would expect up to 
>> 199w. Have any of you noticed this same thing? Do you know what this 
>> is about? It doesn't feel very fair on the user end of things.
>>
>> Sincerely,
>>
>> Rebecca Lundberg
>> Powerfully Gree
>> ​ n​
>> Minnesota
>>
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-- 
--
Louis Woofenden
Engineering Director
Net Zero Solar, LLC
101. W. 5th St., Tucson, AZ 85705
Arizona ROC #248710, 259756, 259521

Phone:520.207.4053 <tel:520.207.4053>Ex. 2
Cell:520.237.5040 <tel:520.237.5040>
Fax:520.203.7230 <tel:520.203.7230>

NABCEP Certified PV Installation Professional™
NABCEP Certified Solar Heating Installer™
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