MPPT arrays in different directions [RE-wrenches]

[Lawrence Elliott]

----- Original Message -----
From: "Doug Pratt" <dpratt at pacific.net>
To: <RE-wrenches at topica.com>
Sent: Tuesday, March 19, 2002 7:10 PM
Subject: RE: MPPT arrays in different directions [RE-wrenches]


> Hi Gary,
>   I'll make your inverter choice even easier for you. Vanner is
> currently NOT making a version of the RE-series inverter that will
> support batteries. Sad but true. They've had some performance problems
> with the RE, and are currently ONLY offering it with the 'Sunlynx'
> direct-intertie gizmo. They're hoping to iron out the problems and
have
> battery-based units available again...uh...soon, but don't hold your
> breath.
>
> Rainman sez, "Definitely, go with the MultiMode."
>
> -the other Real Goods 'Doug'
>
>

> From: douglas bath [mailto:douglas.bath at realgoods.com]
> Sent: Tuesday, March 19, 2002 3:13 PM
> To: RE-wrenches at topica.com
> Subject: RE: MPPT arrays in different directions [RE-wrenches]
>
>
> Rainman sez,
>
> "Definitely go with the MultiMode. Can't miss with the Multimode.
Wopner
> says "simpler is better." Rainman says MPPT will work with extended
> solar
> day, flatter peak but better in the early and late. Definitely go with
> the
> simpler. Judge Wopner on at 5 o'clock."
>
> Can't argue with the Rainman.
>
> Douglas B. Bath,
> Gaiam- Real Goods & Jade Mountain
> 800-919-2400 x6903 voice
> 303-222-8700 fax
> http://www.realgoods.com
> Building a Sustainable World Since 1978
>
>
> -----Original Message-----
> From: Gary Higbee, Solutions from the Land [mailto:ghigbee at efn.org]
> Sent: Tuesday, March 19, 2002 2:30 PM
> To: RE-wrenches at topica.com
> Subject: MPPT arrays in different directions [RE-wrenches]
>
>
> Hi Wrenches,
>
> I'd appreciate your thoughts on a large install I'm working on. We've
> got
> about 5kW of PV, though it is divided into South, East, and West fixed
> roof
> arrays. Not optimum, but the architect got to my client before we did.
>
> We're setting up a 48-volt grid-tied system with battery backup. The
> only
> viable inverter solutions I'm aware of for almost immediate delivery
are
> the
> Vanner RE48-4500 and the AEI MM-5000. I love the way the MM-5000 is
> packaged
> (built-in 5kW MMPT, ground fault, etc.) but I am concerned about using
> one
> MPPT unit on three different PV orientations. I think I heard that
each
> different orientation should have its own MPPT controller. Is this
true?
>
> If I use the Vanner I'll need 5 combiner boxes, 5 Solar Boost 3048
> units,
> and all the ground fault and main breakers (the 5 units encompassing 3
> directions and current limitations). I'd likely use two Outback DC
boxes
> and
> mount the PV controllers in a row above a raceway. I think this could
be
> done in a clean manner, but the AEI is sure attractive.
>
> So, what do you think--lump the whole roof (East, South, West) into
one
> giant array with one MPPT and go with the AEI, or break down the roof
> and
> MPPT each direction, using the Vanner/Outback solution?
>
> THANK YOU!
>
> Gary
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>            Gary Higbee  (ghigbee at efn.org)
>               (541)607-1818 (Eugene)
>              (541)902-8544 (Florence)
> Solar, wind, and hydro site analysis and system design
>     Components dealer and installation assistance
>               ~Solutions from the Land~
>
>
>
>
>
>

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