Midnite makes several good things for this situation, including their E
Panel for the Radian, which I'm sure is better than Outback's version.
They also have low cost AC bypass switch assemblies, and I've recently
used their PV Combiner boxes for AC distribution with AC rated DIN rail
mountable breakers.
I wish they made an indoor version though with more KOs.
R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760
On 8/9/2014 12:24 PM, William Miller wrote:
Scot:
I won't comment on the battery wiring sizing here. What I will say is
that the Radian distribution panels are poorly designed. I have
numerous complaints and if you want detail I can dig up my report to
Outback. Short answer is I suggest anyone do the following:
1.Do not order a prewired system.
2.Remove all AC distribution components from the Outback Radian power
panel and relocate them to two outboard off-the-shelf breaker panels.
One will be Gen fed and one will be Inverter fed.
3.Create your own interlock to provide for generator bypass. This can
use an off-the-shelf breaker interlock but you can do better with a
small aluminum plate, jig saw and drill press. I can provide more
insight on this as well. Will build a lot of custom interlocks and we
are very pleased with the results.
William Miller
Gradient Cap_mini
Lic 773985
millersolar.com <http://www.millersolar.com/>
805-438-5600
*From:*RE-wrenches [mailto:[email protected]]
*On Behalf Of *[email protected]
*Sent:* Saturday, August 09, 2014 11:11 AM
*To:* [email protected]
*Subject:* [RE-wrenches] Changing from 2 battery cable setup to single
cable for Outback?
Greetings,
My team is installing a Outback Radian 8048 to replace an older
dual Xantrex/Trace 5048 inverter setup where one failed either due to
lightning or old age. We did not install the original system.
Battery setup is 48V bank with Rolls 6CS21P Series 5000 batteries (to
be quite honest, largest I've ever seen - 271 lbs per battery, 683AH,
1740CCA). 4 parallel strings of 4 batteries.
The cable from the battery bank to the inverter is two 4/0 RHH
cables. Two for the positive cables and two for the negative cables.
I keep asking the original designer why he used two cables (4
total) and I never quite get the same, straight answer.
Now enter the new Radian inverter and its load center. While there is
a positive load plate to bolt the positive cables onto, there really
is not lots of space through the load center to maneuver the cables.
Even less for the single negative bus bar connection. The load center
has dual 175A circuit breakers built in (one for each of the 4KW
inverters that makes up the 8048)
So my question(s) is (are): can I go from a pair of 4/0 cables to a
single 2/0 RHH cable to enter the load center and carry the battery
load? Why would a designer use dual cables? How does one calculate
the battery short circuit current in order to even determine cable
ampacity requirements? Or for that matter, to determine if the load
center 175A dual circuit breakers are of sufficient size to negate the
need for additional OCPD IAW 694.70C?
I want to make sure I'm doing this right and whenever I'm upgrading a
component, I try to remember that other components likely need
adjust/upgrading...thanks all.
Howard "Scot" Arey
Solar CenTex
254-300-1228
"Use the Texas Sun!"
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