Mark,
The only thing I would add to all your good points is the addition of a
7700 watt TL which is of course perfect to stay under the 20% for load side
connection of a 200A service.
Bill
----- Original Message -----
From: Mark Byington
To: RE-wrenches@lists.re-wrenches.org
Sent: Tuesday, October 07, 2014 6:58 AM
Subject: Re: [RE-wrenches] TL Inverters
Just a word of caution to those not having experience with SMA TL inverters -
the larger units (7-11 kW) have an extremely narrow input DC voltage window.
Depending on your module voltage and string design, all you need is a module or
two to be shaded to fall out of the MPPT input voltage range. The smaller
units (3-5 kW) with the Secure Power Supply don't have this problem. We no
longer use these larger SMA TL inverters unless we can do maximum string length
(e.g. strings of 8 for SunPower 96-cell) and there is zero shade at the site.
I believe SMA is in the process of adding larger units to the line that has
the Secure Power Supply. They added the 6 kW unit earlier this year, and just
announced the 7 kW unit with Secure Power Supply.
Mark Byington
Cobalt Power Systems, Inc.
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