Power Centers, multiple inverters [RE-wrenches]

jay peltz jay at asis.com
Wed Feb 14 17:13:07 PST 2001


Hi Allan,

What a mouth full!!

I have used the older style parallel stacking unit and it works OK.  Seems
pretty sensitive to exactly how the inverters are configured ( ie the set up on
the display). The instructions were good.  Personally I think its the only way
that you are going to get what the customer wants.

I can tell you that the 5548 doesn't surge as well as the 4024, so if you have
large loads but not large surges you'll be OK there.

Let me know about the powercenter info.( I bet that windy can get you some via
BP)  I recommend and have used in the past 2 or even 3 DC disconnect boxes (
you'll need at least three main breakers anyway) and I have used another 175amp
for the input main from the array, wind etc.

Sounds "fun"

Jay

Peltz Power
"Allan Sindelar, Positive Energy, Inc." wrote:

> Wrenches,
> I'm in the process of designing a large grid-backup residential system, and
> I don't have a Powercenter.  Is Pulse currently alive? Anybody have them do
> custom work lately? Is there anybody else doing listed power centers?  I
> would like something like a PC500 in 48V, but with no AC section, no charge
> controller (I prefer to use multiple RVPP Solar Boost 3048s, mounted
> separately), and maybe (see below) 3 DC175 breakers for 3 inverters.
>
> Related question: Has anyone used the SW parallel stacking interface? Does
> it work?  This is a BIG residential system; the G.C. (general contractor)
> wants more AC capacity, but I have recommended no inverter stacking, either
> series or parallel, in order to maximize simplicity and reliability. It has
> been my experience that as system size exceeds proven thresholds, problems
> increase disproportionately. G.C. wants to tell client that the house "can
> run off the solar"; I said whoa!: no load analysis (not really possible),
> too many unknown and big honkin' loads.  Rather, let's run many AC
> distribution home runs, dual AC breaker panels (grid and inverter) with
> gutters and close nipples between them so circuits can be switched if
> needed, but let's live within the practical limits of the system, letting
> grid-only handle the rest.  Advice?
>
> Another related question: As it is, the two planned SW5548s will be
> unstacked; any 240VAC loads will be run off the grid-only AC panel.  Has
> anyone ever done a third inverter?  The G.C. asked about this option; I
> replied I'd never been asked, but it's doable, providing that output goes to
> a completely separate 120VAC load center, to run dedicated loads.  I would
> imagine a [separate "DC subpanel" to inverter to AC load center] to run the
> invisible luxury home needs like sump pumps, etc.  Sort of: one inverter for
> motor/surge loads, one for sensitive (data/audio/video/electronic) loads,
> one for lighting/appliances/house loads. Can BU grid battery charging
> include the third inverter? Advice?
>
> Thanks, Allan @Positive Energy
>
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To check out the other RE-Wrench participants:
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 www.homepower.com

For info contact list moderator by email:
 michael.welch at homepower.com

____________________________________________________________
T O P I C A  -- Learn More. Surf Less. 
Newsletters, Tips and Discussions on Topics You Choose.
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