[RE-wrenches] High Voltage MPPT units

[Drake]

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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Drake Chamberlin
ATHENS ELECTRIC LLC
OH License 44810
CO license 3773
NABCEP Certified PV
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