[RE-wrenches] TL Inverters

[Steve Jefferson]

The first gen of TL's did have a somewhat tight window for the DC window.

However, the new SBxxxxTL-US-22 (3kW - 7700kW, with secure power supply) Start Voltage is 125, MPPT is 175-480 (max of 600Vdc)

Also, for larger needs, the STP (12kW - 24kW)  start voltage is 150, MPPT is 300-800V (max of 1000Vdc).

SMA America, LLC
Steve Jefferson
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From: RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of Mark Byington
Sent: Tuesday, October 07, 2014 6:59 AM
To: RE-wrenches at lists.re-wrenches.org
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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