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

[Allan Sindelar]

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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