Sanyo HIT panels in off grid app [RE-wrenches]

Jay Peltz, Peltz Power jay at asis.com
Fri Nov 2 18:52:46 PDT 2007


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HI Allan,

I do 72v all the time where I live, and have had no problems.

But then its pretty mild here.

jay

peltz power
On Nov 2, 2007, at 4:58 PM, Allan Sindelar wrote:

>
> William,
> This is an important point. It affects most larger offgrid  
> applications, as
> it affects nearly every attempt to use 72V nominal arrays to feed  
> 24V or 48V
> batteries; that is, every attempt to raise voltage in order to  
> reduce wire
> size and voltage drop on long runs. We have several jobs where 72V  
> arrays no
> longer work with CBI DC input breakers rated at 150 VDC (formerly  
> 125VDC)
> when we apply the temperature correction tables in the '05 Code,  
> but we have
> been solidly assured by Outback's upper techs that in the real  
> world, it's
> fine. We're also not in Montana.
> Allan at PosEnergy in Santa Fe
>
> ----- Original Message -----
> From: "William Miller" <wrmiller at charter.net>
>>
>> Ron:
>>
>> When calculating total Voc there are two considerations:  legal and
> technical.
>>
>> The NEC compliance has only come into relevance for my projects  
>> when the
>> total VOC as corrected by NEC correction factors exceeds 600 VDC.
>>
>> In this case, the only limit is the manufacturer's design  
>> limitations in
>> the charge controller.  Using NEC correction factors is irrelevant
>> here.  Instead, the module manufacturer's or the industries  
>> correction
>> factors must be applied.  I don't use them often and don't have them
> handy,
>> but I am certain someone else on the lists does.
>>
>> William Miller
>
>
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