Pulse DC Breaker Question [RE-wrenches]

[Chris Worcester]

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Hi Allen,

We are doing a similar system upgrade with an existing Pulse PC500 & two
SW5548's. Our new roof mounted 6kW PV array is feeding a pair of MX60's
we're mounting on an OutBack PS2DC-175 box which has the room for our GFP/2
CB and four 60A MX60 CB's. The 175A OBDC CB is feeding the PC500 with 2/0
THHN, taking advantage of the shunt for the Trimetric 20-20. I don't know if
you have room for this setup, you can mount the MX60's side by side on top
of the PS2DC for a very narrow configuration, 11.5" wide. Our MX60's will be
on a different wall with conduit and 6 x 6" tray to the PC500, batteries,
inverters, etc.

I haven't seen what the difference is in the PC500 and PSC500, although they
have offered numerous options.

Sincerely,

Chris Worcester
Solar Wind Works
NABCEP Certified Solar PV Installer™
USA Distributor of Proven Wind Turbines
Toll Free: 877-682-4503
Fax: 530-582-4603
www.solarwindworks.com
chris at solarwindworks.com
"Proven Energy Solutions"

-----Original Message-----
From: Allan Sindelar

Wrenches,
I am preparing a design for  a system upgrade and need some help with the
Pulse Powercenter. they want to go from the existing 720
watts of PV to about 4,000 watts. I am looking at two large new arrays wired
at 48 V, each feeding an MX60 and a 24V battery bank. There's an existing
SB50 upgrade on the original array.

The Powercenter is a Pulse PSC500. This unit has five DC breaker spaces for
Heinemann CF panel-mount breakers--that's all. There's a separate QO load
center for multiple 24V DC load breakers. Raising the system voltage is not
a realistic option at this time, and there's very little wall space for
adding big boxes.

Questions:
--How do we add the breakers for two additional charge controllers?
--If we add a 60A Class R fuse for AIC protection on the loads, can I free
up one breaker space by backfeeding a 60A QO for a main DC load breaker in
the DC load center? (I know QO are marginal at 24V per John Wiles, but this
is an existing installation, so this is just a modification; besides, I'm OK
with QOs on the load side as being always safely below 50V per NEC.)
--Could we add a GJ175 next to the existing GJ250 for the SW4024, call it a
charge controller disconnect, and use the tap rule to run multiple
conductors to the three controllers?
--Anyone else make a narrower breaker that's suitable for this application?
Or a small separate enclosure to fit half a dozen 80VDC rated breakers?
--And what's the diff between a PSC500 and a PC500?

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