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. http://relays.te.com/datasheets/ev200.pdf
At 03:16 PM 11/7/2011, you wrote:
Ray,
Yes, the idea was for a low cost way to add
battery backup to existing high voltage PV grid
tie systems, not new construction.
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.
Larry Crutcher
Starlight Solar Power Systems
On Nov 7, 2011, at 11:32 AM, Ray Walters wrote:
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?
I've done quite a few GT systems w/ battery
backup, so I'm always up for new ideas though.
Ray
On 11/7/2011 12:15 PM, Larry Crutcher, Starlight Solar Power Systems wrote:
Hi Glen,
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.
Hello Gary Willit,
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.
Larry Crutcher
Starlight Solar Power Systems
On Nov 6, 2011, at 1:42 PM, Glenn Burt wrote:
Siemens makes a line that are UL listed.
Their VBII series like HNF361PV 30A
-Glenn
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