Voltage drop musings [RE-wrenches]

[Allan Sindelar, Positive Energy, Inc.]

Take it easy, Bill. In my home system in Nuevo Mexico, it flat-ass works. I
get consistent boosts of 15-20%, and have occasionally seen 49.8A from our
1kW array in winter, when we need it (12 MSX64s and 2 AP120s--you do the
math). We made waffles with the electric waffle iron, put the leftovers in
the Maytag fridge, and then ran the dishwasher to celebrate the winter
solstice. The SB50 is one dog that can hunt. I didn't ask the inspector for
permission, either.
    But please report--what specific controller problems did you encounter
on that 54V system?
Allan
----- Original Message -----
From: "Bill Brooks" <billbrooks7 at earthlink.net>

> To all,
> > Lots of numbers are being thrown around about MPPT controllers without a
lot
> of good test data. Beware of manufacturers claims. Having lived with a
> battery-based grid-tied system for over two years with lots of operating
> experience, I believe that an MPPT controller would provide no benefit in
> this climate.
>
> Not necessarily so in other climates, but MPPT controller are really
better
> suited for stand-alone systems. Be very careful about using higher voltage
> battery strings. C-40s and other controllers have a very real upper
voltage
> limit that will bite you. Just returned from check a 54 volt system that
was
> experience controller voltage issues.
>
> It's nice to throw around a lot of numbers, but until you constrain the
> application, it is way to broad of a statement to say that MPPT
controllers
> are the way to go. When are they going to get UL? The controller does not
> exist in my book until that happens.
>
> Bill.


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