48 Volt Solar Boost 50 [RE-wrenches]

[allan]

Travis,
    According to Rick at RVPP, the factory default setting will work with
the typical modern module, with MPP around 17 volts.
    We are often putting these in existing systems, with mixed modules, old
modules, Quad-Lams, and Tri-Lams, so we usually have reason to tweak.  For
awhile my home system was based on mud Quad-Lams, which had a 53V VOC (24V
nominal).  I set MPPT all the way up and still could have gone farther.  I
was getting winter input-output display boosts of 50%--of course, 50% more
mud is still mud, and I replaced the array.
    The key is that there's only one setting on the RV50, so you end up with
a "happy medium" with mixed array outputs.  Occasionally we will bring in
part of an array on the old controller, figuring more total output with no
boost on unmatched modules.  I did that recently with an SB2000 when one
module was a 33-cell Arco M75.  Client had undersized array wire anyway, so
we used it for the M75 and ran new wire for the rest.
    Rick at RVPP knows his theory, his code, and his wrenching, and has been
accessible to us.  He also sez he's trying to keep his product away from the
internet and HP discounter scum, to give us a fighting chance at skilled
design.
    Re the same shunt: Yes.  And by the way, two Tri-Mets can use the same
shunt too, according to Ralph Heise.  Makes sense to me.

Enjoy the Sun!
Allan @ Positive Energy
-----Original Message-----
From: Travis Creswell, Ozark Solar <ozsolar at ipa.net>
To: RE-wrenches at topica.com <RE-wrenches at topica.com>
Date: Monday, August 14, 2000 1:00 PM
Subject: Re: 48 Volt Solar Boost 50 [RE-wrenches]


>Allan,
>
>How much more effective is this than just using the factory settings?  As I
>read it the unit is ready to go for the "average" 75 module?  Can you use
>the same shunt as the Tri-Metric if you have one in the system?
>
>Travis Creswell
>----------
>>From: allan <allan at positivenergy.com>
>>To: RE-wrenches at topica.com
>>Subject: Re: 48 Volt Solar Boost 50 [RE-wrenches]
>>Date: Mon, Aug 7, 2000, 6:05 PM
>>
>
>>Our biggest headache is difficult initial setup.  It takes a separate 12V
>>battery temp'ed in to set up the MPPT boost, as batteries must be full or
>>nearly so to set finish voltage from a meter.  We use an old 12V 35A gel
>>cell for this.  Of course, setting MPPT boost is best on a low
battery...So
>>sometimes it's a guess. Test points a la C40 would be nice.
>
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