Design Challenge (Was Sunny Island Experience?) [RE-wrenches]

[David Katz]

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Jeff,
I use 30 amp relays from Grainger.  They are reliable and not too 
expensive.  since you have to go such a long distance, AC makes sense 
for the relay coils, but the Outback inverter aux relay is actually a 12 
volt output, so you would have to put smaller relays at the inverter end 
to switch the AC for the coils. 
David

David Katz
President, AEE Solar
formerly Alternative Energy Engineering
1155 Redway Drive - Box 339
Redway, CA 95560 USA
Phone (707) 825-1200
Fax (707) 825-1202
email: david at aeesolar.com
web: www.aeesolar.com


Jeff Clearwater wrote:

> Hey Jay,
>
> Yes, I've been following this configuration for a while now (Dave K., 
> Sam V.and many others), just wanted to make sure you were not talking 
> some specific limitation of the VFX as opposed to a GTFX when in 
> off-grid mode.
>
> And yes one must use the software modified SB - usually modified for 
> the Sunny Island - with the higher voltage and frequency parameters.
>
> And with more than one SB feeding into a FX stack, one could 
> accomplish the rough equivalent of staged charging by having different 
> VFX relays control each SB shutoff at slightly higher voltages as a 
> charge limit set parameter.  Anyone see any problems with this?  
> Anyone try it and have pointers?
>
> What relays are you using?  With SB2500s you are just switching 12 
> amps at 240VAC - but I would want higher reliability than many of the 
> DIN Rail mounted relays out there.  Suggestions?  I'll have about 750' 
> between my SBs and FXs - so I'll probably go with 120 or 240 volt 
> relay coils.  What did you use?
>
> Thanks again!
>
> Jeff C.
>
>
>> - 
>
>

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