Grid tie/SW [RE-wrenches]

[Bill Brooks]

Blair,

I'm seeing a lot of efficiency numbers being thrown around lately and it
concerns me. What are you using to come up with the efficiency numbers you
have shown for the SW and GC-1000? It sounds to me you are starting with
some module spec and working back. The only way to do this is with accurate
(expensive) dc and ac measurements that are beyond the capability of most
installers. I grant you that the efficiencies my not be anywhere near the
published numbers for the SW (95% number is in stand-alone mode going into a
resistor), but it definitely not 75% on average. A good average number is
85% with peak efficiencies around 88% with the new software. The GC-1000 is
in the high 80s for average efficiency. Not sure of ST, but understand it is
similar to GC-1000.

There is no standard protocol for measuring power from an inverter. Our
company is working with Sandia on this very problem. It is a very important
issue especially given the misunderstandings generated by the manufacturers
numbers that are posted by the CEC.

Bill.


> -----Original Message-----
> From: blair Tump may [mailto:tump at midcoast.com]
> Sent: Wednesday, June 27, 2001 8:42 AM
> To: RE-wrenches at topica.com
> Subject: Grid tie/SW [RE-wrenches]
>
>
> We  have a GC1000 inverter for our display trailer, the unit works very
> well and IS quiet. 1200 wts in @ 930-950 out.
>   Another unit on line in Calf seems to be working well also, although
> there was some efficient discrepancy w/ the meter...... We have
> found that
> over sizing the input array 15% higher than expected AC output helps the
> efficiency.(2880 wts for the ST 2500)
>    We found the folks at Advanced Energy did get back to us after
> we found
> the right contact person....ext 113 Daniel 2 Eagles was and
> continues to be
> helpful as does Rob and the folks in the background  there. The
> manual (for
> me) wasn't too clear but Ed @ AE was helpful.The new? meter has a
> few bugs
> screen not to clear, power in lower than power out, little things
> that I'm
> sure will work out soon.
>         As for  the time the 3MM @ 5 MM  inverters,  Daniel has said that
> it could be as soon as this week or late July. I had the pleasure of
> meeting these folks not a large shop in size but in suture ,good
> folks.   AEG has a LARGE shop build there units (out      sourcing) so I
> don't think that once they get UL approval there will be too much
> of a lead
> time to get.
>       The 5MM looked and worked well not too noisy and it did
> WHACK that 1
> hp well pump w/ little voltage sag. You can install these units
> w/ a small
> 48 vt battery bank to start and then move to a larger BB. NICE LOOKING
> unit, concerns about RF noise attended to, all in all we are
> trying to move
> these units know that there is support + I know where they live
> if there is
> a problem!
>     The SW units we have found for a grid tie system seem to run
> 70-74% as
> the AEG GC1000 grid tie seems to be 83-5%.
>
>
>
>
> Solarwinds NorthernLights
> Serving Mid Coast Maine & Northern California
>           610-517-8401              707-498-2804
>
>
>
>
>
>
>
>
>
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