[RE-wrenches] MLSD module level shutdown

[Ray]

Yes, I would like more info too.  I'm all about safety, but it needs to 
be based on reality not theory.  For instance, would string level shut 
down have stopped the arcs you mentioned?  Also, I second the 
screening.  Even if MLSD stops the fire, the rodents have still won the 
day by taking out part of the array.  How about an exemption from MLSD 
for systems below a certain voltage, and having animal guard in place, 
and those would still have string level shut down.

Ray Walters
Remote Solar
303 505-8760

On 1/29/21 3:58 PM, frenergy wrote:
>
> Andrew,
>
>             If these are the only two examples of justification of 
> MLSD and not knowing the details of the examples you've cited, I 
> suggest there is a more effective, equal in labor to apply, less 
> expensive, durable solution.  For the squirrel problem, an alternate 
> solution is one of the available edge of array screen products.  Not 
> only does it stop the squirrels but it works for mice, leaves, pine 
> needles, etc.
>
>             Can you enlighten us about the cause of the resi fires 
> that were caused from the lack of MLSD's?  Poor wire management? And 
> was the hole in the metal roof caused by the squirrel having lunch on 
> the wiring?
>
>             I feel it worth diving into this deeper for a variety of 
> reasons.
>
> Bill
>
> Feather River Solar Electric
> Bill Battagin, Owner
> 4291 Nelson St.
> Taylorsville, CA 95983
> 530.284.7849
> CA Lic 874049
> www.frenergy.net
> On 1/29/2021 11:56 AM, Solar Energy Solutions wrote:
>> Dear All,
>>
>> I have been an outspoken critic of module level shutdown for all the 
>> reasons folks do.  However, I have come around.  We have witnessed 
>> too many systems where rooftop wiring has been chewed up by 
>> critters... mostly squirrels.  We have seen everything from 
>> residential fires to holes in metal roofs caused by a DC arc.   I 
>> never thought I would see the day when I would not only be thinking 
>> MLSD is a good idea but advocating for it.
>>
>> Smiles,
>> **Andrew Koyaanisqatsi**
>> *President*
>> **Solar Energy Solutions, Inc.
>> /The BRIGHT CHOICE/
>> **
>> *Since 1987,**helping you and your Portland neighbors
>> move**towards an environmentally sustainable future.*
>> **503-238-4502
>> www.SolarEnergyOregon.com <http://www.solarenergyoregon.com/> **
>>
>>
>> On Friday, January 29, 2021, 11:25:28 AM PST, 
>> sky at ecologicalsystems.biz <sky at ecologicalsystems.biz> wrote:
>>
>>
>> So far the module level shutdown requirements have been a real blow 
>> to our industry. The reliability and cost from a maintenance and 
>> installation standpoint has been very hit or miss so far. It feels 
>> like this requirement was rolled out far too quickly without enough 
>> forethought to its impact on the industry. We are constantly going 
>> out and fixing problems with mlsd installed by other contractors. 
>> Thankfully the problems have nothing to do with the quality of the 
>> installations. The problems are almost all due to premature failure 
>> of the products or some inherent defect in them. This is a serious 
>> issue costing the industry time and resources and making our 
>> installers less safe. It just doesn’t really accomplish the intended 
>> goal of the requirement.
>> I’m curious how other wrenches are dealing with this issue. I 
>> recently became aware of fixMLSD.com which appears to be focused on 
>> bringing a more sensible approach to this requirement.
>>
>> Your thoughts are appreciated,
>> Sky Sims
>> Https://EcologicalSystems.biz
>> “Just An Old Wrench”
>> _______________________________________________
>>
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