Grid-Tie Inverters with Batteries [RE-wrenches]

Mark Edmunds mark.edmunds at xantrex.com
Fri Sep 10 08:55:32 PDT 2004


 

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Hi Bill and Wrenches,

The transfer time for the SW/SW+ depends a lot on what it is doing at the
time the grid fails. If it is selling at a rate close to the backed up load
requirement there is virtually no interruption as the inverter is able to
immediately support the load as the grid is lost. If it is sitting in float
with a large load that suddenly needs to be backed up there will be about a
cycle delay while the inverter comes up. 

A general guide on these is you will be OK if your loads can tolerate up to
20ms ride through, which most PC's etc. can.

Cheers,

Mark Edmunds
Xantrex Technology Inc.

-----Original Message-----
From: Bill Brooks [mailto:billb at endecon.com]
Sent: Friday, September 10, 2004 8:22 AM
To: RE-wrenches at topica.com
Subject: RE: Grid-Tie Inverters with Batteries [RE-wrenches]

 

Todd,

I believe that the standard for UPS transfer times is less than 1 cycle 16.7
ms. I'm pretty sure that many do it in an average of half that time.
Anything higher (up to 20 cycles) we might call "like a UPS". No PV inverter
that I know of is a true UPS. I think the fastest a SW can transfer is 2-3
cycles (32-48ms) and higher depending on the load and when it senses the
interruption. Many computer power supplies can handle outages of up to 20
cycles, depending on what they are doing at the time (power draw). The holy
grail is to get transfers for PV inverters into the half-cycle range, but
that may mean that you make your equipment so sensitive, that it is always
switching to backup even with a small transient. It depends on the
application and how desperate you are to not lose data or power. A high
quality UPS is still a good idea, even with a battery-backed system, if you
have a very critical application.

Bill.

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