[RE-wrenches] Tell me what I'm missing on 690.12 B(2)? Where does it say "module-level???"

[Ray]

The Midnite SOB system is up and running.  We have one installed that 
has been working trouble free for about 8 months.

Ray Walters
Remote Solar
303 505-8760

On 4/27/19 12:07 PM, Mick Abraham wrote:
> Scot Arey wrote:
>
>
>         "How did “module-level” shutdown get taken as gospel truth??
>
>         I’m thinking a Fronius Primo with its RSD Quattro device
>         mounted on an array rail meets current 2017 code."
>
>
> Mick here: The issue is that if a Fronius type PV "string" is 
> interrupted at the edge of the array, one still has open circuit 
> voltage on the string that's much higher than the 80 volt limit. The 
> MLPE "module level power electronics"--whether they're microinverters 
> or DC optimizers--snub any sum of AC or DC voltage below 80 when 
> they're in shutdown mode. Both of those solutions also optimize to the 
> level of individual PV modules & they provide granular metering of the 
> energy deliveries--but I assume those benefits are of little value to 
> the project you're planning, Scot.
>
>
> I don't know the availability status for Midnite's SOB "Shut Off Box", 
> but this segments the PV string during shutdown & it gets the voltage 
> below 80 without the expense of optimization & granular monitoring. 
> There are still "electronics" behind each PV module because these 
> shutoffs are triggered by radio but it's not MLPE in the usual sense & 
> the cost is relatively low since all they're doing is opening 
> contactors. I hope this reply is helpful.
>
>
> The Wrench List is The Bomb!
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