Outboard equipment for PV5 [RE-wrenches]

[Bill Brooks]

William,

Trace Tech normally sells their equipment to companies that do their own
design engineering or hire engineers to design their systems for them. Now
that they offer smaller inverters, it may seem like they should provide more
design input, but they are not currently setup to do this. Remember, they
service a major part of the variable speed wind turbine industry with
inverters--huge inverters.

A couple of quick tips for free--then we start charging:

1. The Trace Tech inverter must have a floating output--either connected to
a delta-delta connection or a delta-open wye configuration. This is an
isolation tranformer. The only way you could use a tranformer on site would
be if it was dedicated to your unit, the transformer was ungrounded, and is
properly rated for the inverter. If you ground the isolation transformer,
the inverter will not work. It is only grounded on the DC side (negative
pole or center-tapped neu. The AC neutral is referenced to ground at the
main sub panel. It is preferable to buy the transformer through Trace Tech.

2. The combiner must be a 600V combiner. This is NOT a TCB-10. Trace sells a
6,12, and 22-string combiner.

3. If the AC circuit breaker is within view of the inverter, it could be
used as the AC disconnect. It would need to be at least a three-pole, 20-amp
breaker.

4. If you support the conduit properly, Rigid Non-Metallic PVC should be
okay. Local codes may govern. Occasionally you run into situation where
Rigid Metallic is necessary. Check with the jurisdiction first.

Bill.


> -----Original Message-----
> From: William Miller [mailto:wrmiller at slonet.org]
> Sent: Monday, June 11, 2001 6:21 PM
> To: RE-wrenches at topica.com
> Subject: Outboard equipment for PV5 [RE-wrenches]
>
>
> Pals:
>
> As you all know by now, I am bidding on installation of a Trace Technology
> PV5 and I can't get Trace Tec to return my calls.  Maybe one of you can
> answer some questions:
>
> This system will go into a facility with a 440V feeder.  There is an
> existing 208 transformer and sub-panel. Trace lists some equipment as
> optional and a transformer as "required" if the local building department
> requires the panels be grounded or if the line voltage is not 208.  There
> is no manual for the PV5.  The manual or the PV10 (AKA the 10208) says the
> transformer is required, period.  The client has a 440 to 208 transformer
> already.  Do we still need to purchase one from Trace Tec?  By
> grounded, do
> they mean one pole of the DC feed or do they mean the frame of the panels?
>
> Also, they list a number of optional items and I need to know if
> I need any
> or all of them and how they are installed.  For example, they offer a 20 A
> AC circuit breaker.  I have space for a 3 pole breaker in the 208 panel.
> Do I need another one?
>
> They list a combiner box.   This looks like the same one that has flamed
> out for several wrenches.   This unit will be run at close to 600 VDC.
> Will it take this voltage?
>
> This is a code question:  This equipment will be installed at a public
> pool.   Can the conduit be installed at about 8 feet above the deck (PVC
> Sked 40)?
>
> Thanks for considering these questions.
>
> William Miller
>
>
> __________________________________________________________________
> William Miller
> SLO Communications: Communications and Power Systems Consulting
> PO Box 50, Santa Margarita, CA 93453
> Voice :805-438-5600		Fax: 805-438-4607	VMail: 805-546-4875
> email: wrmiller at slonet.org
> License No. C-10-773985
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