[RE-wrenches] paralleling FM-60's

[Mick Abraham]

This sounds like a job for a single Apollo T-100. If you do that, Jay,
be sure to wire the solar strings with somewhat more than 36 PV cells
for every 12 volts of battery.

Jolliness,
Mick Abraham, Proprietor
www.abrahamsolar.com

Voice: 970-731-4675



On Wed, Oct 20, 2010 at 10:00 AM, Kent Osterberg <kent at coveoregon.com> wrote:
> William,
>
> There are some issues with putting the charge controller at the other end of
> the feeder:
> 1. The advantage of a higher voltage feeder is lost.
> 2. The voltage drop in the feeder will mess up the charge controller's
> absorption and float set points.  Say there is only 1% drop in the deeper,
> that's 0.14 volt for a 12 volt system (2x for 24 or 4X for 48 volts).   If
> the feeder loss is more ...  You could raise the set points at the regulator
> to offset the feeder loss, but the loss in the feeder is not a constant.
> 3. The charge controllers are not NEMA 3 rated, they need to be inside.
>
> Kent Osterberg
> Blue Mountain Solar
>
>
>
>
> William Miller wrote:
>
> Jay:
>
> Bad idea.  The differences in tolerances within components will make one
> work harder than the other.  They will never balance.  Why not put the
> charge controllers at the other end of the feeder?
>
> William Miller
>
>
>
> At 08:06 AM 10/20/2010, you wrote:
>
> HI All,
>
> Say anyone ever paralleled mx/fm-60's?
>
> I have a unique situation that would be very expensive to pull additional
> wire however the existing wire is large enough to need 2 fm-60s'
>
> If I put a diode between them so they don't feed each other any problems
> that anyone knows of?
>
> thanks,
>
> jay
>
>
>
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