Four MX-60s and a PSDC

Discussion about the Power System DC Disconnect (PSDC)

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arnold
Forum Guru
Posts: 158
Joined: Sun Jul 07, 2002 11:01 pm
My RE system: Current: 10.9 kW STC (128 BP-585), 4 MX60, 3 GVFX, 4 Concorde PVX-12255
2.46 kW STC (12 KD205GX-LP), Xantrex GT2.8
Previous (still owned): 9.1 kW STC (108 BP-585), 6 SB 3048, 2 SW5048, 8 Concorde PVX-12255

Four MX-60s and a PSDC

Post by arnold » Wed Nov 27, 2002 10:17 pm

What is the recommended/elegant way to connect/mount/attach four MX-60s to the side of a PSDC?

Unfortunately the charge controller bracket holds only two.

arnold

Christopher

Four MX-60s and a PSDC

Post by Christopher » Tue Dec 03, 2002 2:09 pm

Two of the MX60 controllers can go on top of the PSDC (but then the displays are hard to see. Another option is to extend the Charge Controller Bracket (CCB) to allow 4 MX60s to be mounted in a 2 x 2 configuration. The wiring of the second MX60 would go through the first. I haven't tried this but it would work. You might need to support the outer two MX60s to the wall however.

You do not need to run the PV's DC negative to each controller, BTW as we measure the current in the positive conductor. In fact the battery negative wiring can be daisy chained from one MX60 to another without any problems.

arnold
Forum Guru
Posts: 158
Joined: Sun Jul 07, 2002 11:01 pm
My RE system: Current: 10.9 kW STC (128 BP-585), 4 MX60, 3 GVFX, 4 Concorde PVX-12255
2.46 kW STC (12 KD205GX-LP), Xantrex GT2.8
Previous (still owned): 9.1 kW STC (108 BP-585), 6 SB 3048, 2 SW5048, 8 Concorde PVX-12255

Four MX-60s and a PSDC

Post by arnold » Tue Dec 03, 2002 7:36 pm

I like the idea of the 2 x 2 configuration. I was wondering if the running the wiring through was going to be ok, happy to hear that it will work. I'm sure we'll figure out how to support the extra units on the side. I really want the install to look "sharp" when I show the system off.

I'm also excited to see the manual for the MX-60 posted on the site.

My temporary system is getting closer and closer to being done. My installers are loaning me some STXRs until the FX-2048 grid tie units are ready.

arnold

Alex
Forum Member
Posts: 8
Joined: Thu Feb 19, 2004 11:01 pm
Location: Orange County CA

4 MX60s on a PSDC

Post by Alex » Sat Jul 31, 2004 5:24 pm

I would be more worried about where do you find the room for (4) MX60 breakers on a PSDC...

Things are fine if you are not using any OBDC-GFP/2 ground fault interrupters. Here is the problem if you do: each MX60 requires a breakers at both its input and output; so (8) 3/4" spaces are necessary for (4) MX60s. You add (3) 3/4" spaces for each GFP/2 and you got a requirement of 8+3 =11 3/4" breaker slots. PSDC has only (10) available.
Also chances are that if you are using (4) MX60s, your PV array size may require more than one GFP/2 to protect it. Also, each MX60 requires its own "circuit" on a GFP/2, which means that you start adding a 2nd GFP/2 if you got more than (2) MX60s.

I am facing this problem with a project that uses (3) MX60s and (2) GFP/2s. I plan to add a PS2 mounting plate under the main quad PS system. The smaller PS2 plate will carry the MX60s and a PS2DC box.
That PS2 plate and PS2DC box by itself could support (4) MX60s, (2) GFP/2s and the (8) input/output DC breakers for the MX60s.

I admit this solution leaves the PSDC enclosure on the quad plate under-utilized, housing only the big DC breakers feeding the inverters. A bit more pricey too; no offense to Outback, but I wish there was a more elegant solution than mounting MX60s on the side and on top of the PSDC enclosure as depicted on page 4 of the MX60 manual, they look like warts growing off the enclosure... not very convenient access to the front panel controls of the MX60s either.

Anything in the works to solve this problem ?

Alex

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