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I vote for the AC coupled system. But if you need to make a 600 VDC
transfer switch, I think you could likely make one from Tyco relays and
voltage controlled relays.
<a href="http://relays.te.com/datasheets/ev200.pdf" eudora="autourl">
http://relays.te.com/datasheets/ev200.pdf</a><br><br>
At 03:16 PM 11/7/2011, you wrote:<br>
<blockquote type=cite class=cite cite="">Ray,<br>
Yes, the idea was for a low cost way to add battery backup to existing
high voltage PV grid tie systems, not new construction.<br><br>
The second inverter does not need to be able to sell since that is
handled by the grid tie inverter. It simple passes grid power to loads
and maintains the battery. That means any off-grid inverter/charger or
even low cost separate inverters and chargers may be used, a very
economical solution. However, the idea may be of no value because it
appears no one makes a transfer switch.<br><br>
Larry Crutcher<br>
Starlight Solar Power Systems<br><br>
<br><br>
<br>
On Nov 7, 2011, at 11:32 AM, Ray Walters wrote:<br><br>
<blockquote type=cite class=cite cite="">Just curious, what's the
advantage of switching at the array vs. just using a Sunny Island or
Outback system? Seems this would cost more, and have less efficiency,
since you would still have the battery float losses, backup inverter idle
losses, in addition to the 2nd grid tie inverter losses. Are there site
specific conditions driving this that I'm not understanding?<br>
I've done quite a few GT systems w/ battery backup, so I'm always up for
new ideas though.<br><br>
Ray<br><br>
<br>
On 11/7/2011 12:15 PM, Larry Crutcher, Starlight Solar Power Systems
wrote: <br>
<blockquote type=cite class=cite cite="">Hi Glen, <br>
That model is a disconnect switch. What the system needs is a 4 pole
transfer switch, automatic or manual, to connect the PV source to the
charge controller.<br><br>
Hello Gary Willit, <br>
Yes, you've grasped my concept precisely and I agree, getting a high
voltage DC transfer switch may nix this design. Sounds like a product for
Midnite Solar to build.<br><br>
<br><br>
Larry Crutcher<br>
Starlight Solar Power Systems<br><br>
<br>
On Nov 6, 2011, at 1:42 PM, Glenn Burt wrote:<br><br>
<blockquote type=cite class=cite cite="">Siemens makes a line that are UL
listed.<br>
Their VBII series like HNF361PV – 30A<br>
<br>
-Glenn</blockquote></blockquote>
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