[RE-wrenches] UL3741

[Lou Russo]

Derek is great and entertaining and has been on the UL3741 mission for a
while now.
Mayfield Renewables has a great video (1 hour long), though not as
entertaining, that really digs into UL3741

https://youtu.be/FIPZibVbrus?si=LyI6TpLEMiV_8-GO

On a side note, Mayfield Renewable is a great outfit to work with for your
larger (greater the 100kW) installs.

Aloha,

Lou Russo
Owner
lou at spreesolarsystems.com
Office - 808 345 6762
Spree Solar Systems LLC
CT-34322



On Tue, Oct 8, 2024 at 5:55 PM david quattro <david at quattrosolar.com> wrote:

>     This is an excellent explanation of many aspects of 3741.
> https://youtu.be/mgD0O9WfKVU?si=-SRdLuTd4XGDToKp
>     At the NABCEP conference in Raleigh earlier this year, there were
> popular presentations about 3741.
>    I think it can be a great solution for some small commercial, but not
> for residential.
>
>
>
> On Tue, Oct 8, 2024 at 12:41 PM Dave Tedeyan via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> Hi Lou,
>>
>> It looks like Ironridge with the Midnite's MNSSR-600S-SS and some Solis
>> Inverters (or Tesla) are compatible. But that is all I know of off the top
>> of my head.
>>
>> https://www.ironridge.com/2024/02/27/flush-mount-systems-listed-to-ul-3741/
>>
>> I have not actually pursued this yet, but would be curious to hear if
>> others have and whether they like it.
>>
>> Cheers,
>> Dave
>>
>> On Tue, Oct 8, 2024 at 3:01 PM Lou Russo via RE-wrenches <
>> re-wrenches at lists.re-wrenches.org> wrote:
>>
>>> Hello Wrenches,
>>>
>>> We are researching UL3741 and NEC2020s Photovoltaic Hazard Control
>>> System. Whether it is safe or not is a discussion for another time.
>>>
>>> After digging around a bunch it does not seem to be really geared toward
>>> us residential (grid-tied and off-grid) and small commercial installers.
>>> But I wanted to connect with folks who know the landscape better than us
>>> before we disregard it for the foreseeable future.
>>>
>>> UL3741 listed racking systems and solar panels are not the limiting
>>> factor, as there are enough manufacturers listed that we use regularly and
>>> can get easily. It appears that Midnite's MNSSR-600S-SS may be a good path
>>> for us as it has been tested with the Sol-Ark15k but from what I can tell
>>> not to UL3741 standards.
>>>
>>> It seems the short list of compliant inverters with a compliant racking
>>> system using Midnite's MNSSR-600S-SS is what would hold us back. As we
>>> don't actively use any of the listed inverters.
>>>
>>> Has anyone heard from inverter manufacturers that are actively working
>>> with a racking company on getting UL3741 or if they EVEN  want to pursue it
>>> (besides Tesla, Solis, SMA, GrowWatt)?Specifically battery based hybrid
>>> inverters or charge controllers. I can't seem to find any.
>>>
>>> Thank you for your input.
>>>
>>> Aloha,
>>>
>>> Lou Russo
>>> Owner
>>> lou at spreesolarsystems.com
>>> Office - 808 345 6762
>>> Spree Solar Systems LLC
>>> CT-34322
>>>
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