XR2500 Installation [RE-wrenches]

Tue Jul 2 16:17:31 PDT 2002

I don't know about 65%. It seems low. I use 76% for the ST2500 and 78% for
the SB2500 for conservative estimates.

Module watts DC STC - 0.9 generic temperature derating - 0.98 dust and dirt
- 0.98 module mismatch - 0.98 wire loss - 0.9 for the ST2500 and 0.92 for
the SB2500 inverter efficiency x number of modules x adjusted sun hours (see
Bill Brooks' installer protocols) = watt-hours/day.

Kent Sheldon wrote:

> Joel, am I reading this right? This customer is really happy with 65%
> STC rating on their system???? Wow.
> ____________________________________________
> Kent Sheldon
> Manager, Industrial Power Systems
> SMA America
> ksheldon at sma-america.com
> 925 513 8813 Brentwood Office (Primary)
> 530 273 4848 Grass Valley Office
>
> -----Original Message-----
> From: Joel Davidson [mailto:joeldavidson at earthlink.net]
> Sent: Sunday, June 30, 2002 6:16 PM
> To: RE-wrenches at topica.com
> Subject: XR2500 Installation [RE-wrenches]
>
> I think installers will find this interesting. One of our customers gave
> us permission to share this June 29 email with you all. The customer
> ordered an ST2500 back when Xantrex stopped shipping. We wanted to give
> him his money back. Instead, he decided wait almost a year for the XR.
> (FYI-Southern California Edison does not require a locking disconnect.)
> -----
> Hi Joel. Thought you would like to hear an update. Last Thursday, I
> obtained a final with the county of San Bernardino. Hurray! All the
> inspector wanted to look at was the AC side. I do not think he
> understands the DC side, which was fine with me. He looked at the panels
> and the inverter but did not have any corrections. Either I know what I
> am doing or the inspector does not know what he was looking at. I am now
> producing grid quality solar electricity.
>
> I connected my AC to the subpanel at the back side of the house. I know
> this is different, but it works fine and the meter at the main panel can
> still be removed to disconnect all power to the grid if a lineman wants
> to work on the power lines. The inspector discovered that when the
> subpanel was installed 7 years ago, the original electrician had bonded
> the neutral to the ground. The bond between the neutral and the ground
> was only suppose to happen at one point of the entire house. Since the
> bond was already at the main panel, the inspector wanted me to add a
> second ground strip and move the ground wires to the new ground strip. I
> asked him if I could remove the bond but he said that would be modifying
> a UL rated subpanel. Sounds picky to me but it was an easy fix. I did
> what he said for $5 and received a final.
>
> I also called Southern California Edison Friday and got a verbal
> approval to start selling to the grid as long as I faxed the finaled
> card to their attention that day. I have been on the grid for some time
> testing out the system.
>
> The STRX-2500 works great. Everything is automatic like I was told and
> after 5 minutes it will start to sell electricity and it never stops due
> to poor electricity or problems outside of the parameters that the STXR
> is allowed to work under. The best that I have done in one day is 12.5
> kW. By the way, I am sure it is not a surprise to you but the
> electricity that is made is just like the Zantrex white papers said with
> all of the corrections. It is sad that the corrections are at 35% but
> that’s life. The system produces 35% less than the panels are rated for.
>
> The low speed fan sounds like it is tumbling rocks (quietly but
> tumbling) and the high speed only comes on between 2 seconds and 20
> seconds durations during peak power times between 12 noon and 5 pm,
> depending on the temperature outside? Or temperature of the electronics?
> The low speed sounds like a fan on poor quality electricity with the
> rumbling sound but maybe that is normal. It appears that my load of 1500
> watts is barely enough to start the high speed fan and that is why the
> fan cycles on high speed.
>
> I have the remote and I watch it often. Edison’s voltage sure does vary.
> I have seen the voltage as low as 239 volts and as high as 253 volts.
> The remote will also tell me if the hertz, temperature or voltage are a
> problem. So far no problems. I am looking forward to 30 years of clean
> electricity.
>
> It appears that Zantrex was running a promotion during May and I
> received a free 5 year warranty since the STXR was shipped May 14th.
> That was good news! Monday I plan to submit my receipts to the
> California Energy Commission for the rebates. Should go well like
> everything else. Times have changed in the last few years when working
> with the utilities, etc. was more difficult. I am glad that I waited.
>
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