Friends,
Help disabuse this old timer of his outdate notions:
crystalline modules
MPPT tracking inverter
a sting of modules operate at max power in full sun
shading causes enough cells in the first substring in the first module to
go into resistance to the point that the substring "turns off" a
Hello Wrenches,
I am installing a Classic 150 controller in an RV with potential 95 amps output
at 12 volts. The customer has a Midnite DIN box and wants me to use it for the
controller output. I am out of 150VDC breakers but I have two 60 amp breakers.
Is it safe and reliable to use the 2 brea
Hello Wrenches,
We are trying to understand what will happen on a fairly steep roof
(34 degree pitch) when snow comes off a large array and hits ice
breakers on the metal roof. Before the ice breakers were installed
on the bottom couple of feet of the roof, the gutters experienced
damage fro
Why not use one of Midnite's new 100 amp din breakers?
Jonathan Hill
Solar applications engineer
Solar Electric Supply
530-559-3781
solar...@solarelectricsupply.com
On Feb 27, 2013, at 8:06 AM, "Larry Crutcher, Starlight Solar Power
Systems" wrote:
> Hello Wrenches,
>
> I am installing a Clas
Drake,
We deal with issues like this in New England all the time. Yes there are times
when a large buildup of snow will overshoot the ice breakers. We just had 2'+
of snow and I had one array with a pitch similar to yours where the snow
overshot an Alpine Snow guard and ripped half the snow g
We are installing the system today and I only have 60amp in stock. Customer
lives in CA and is leaving today after the installation.
Larry Crutcher
Starlight Solar Power Systems
On Feb 27, 2013, at 9:17 AM, Jonathan Hill wrote:
Why not use one of Midnite's new 100 amp din breakers?
Jonathan H
Larry
Our 100 amp din rail is essentially 2 breakers in parallel. So in theory
the 2 60 amp breakers "Could" work but. My concern would be that they
may not be tripped at the same time where they are not internally
ganged. I can't say "Go Ahead" but.
Ryan
--
Ryan Stankevitz
Technical Support
Hi Ryan,
There is a pin whole through each handle. If I connect the handles together
with a pin, they can only be set or tripped as a set. So will this external
"ganging" do the same thing?
Thank you,
Larry Crutcher
Starlight Solar Power Systems
On Feb 27, 2013, at 9:44 AM, Ryan wrote:
La
Check out NEC 240.8dbDan BrownFoxfire Energy Corp.Renewable Energy Systems(802)-483-2564www.Foxfire-Energy.comNABCEP #092907-44
Original Message
Subject: Re: [RE-wrenches] DC circuit breakers in parallel
From: "Larry Crutcher, Starlight Solar Power Systems"
Larry:
The Code requires parallel breakers to be designed for this application
(internally ganged).
Just using a handle tie does not allow you to use the poles in parallel.
Best Regards,
John Berdner
General Manager, North America
SolarEdge Technologies, Inc.
3347 Gateway Boulevard, Fremont CA
Hi Dan,
NEC does not apply to mobile systems. Thus the reason for asking about "safe
and reliable" instead of code compliant.
Thank you,
Larry Crutcher
Starlight Solar Power Systems
On Feb 27, 2013, at 11:56 AM,
wrote:
Check out NEC 240.8
db
Dan Brown
Foxfire Energy Corp.
Renewable
Use a good "pin" to lock them together. Make sure they can't
disengage (lock-tite the hardware, etc.) and you're good to go.
Stay warm out there (ha!).
Dan
--- On Wed, 2/27/13, Larry Crutcher, Starlight Solar Power Systems
wrote:
From: Larry Crutcher, Starlight Solar Power Systems
Subject:
This is true. They must be internally ganged when tripping.
Be aware that these breakers may not be internally ganged
when you manually switch them on and off though. That is
where the pin comes in.
boB
On 2/27/2013 11:05 AM, John Berdner wrote:
Larry:
The Code requires parallel breake
And perhaps, size each of the conductors for the entire 95 Amps.
Dick Ratico
Solarwind Electric
--- You wrote:
Use a good "pin" to lock them together. Make sure they can't
disengage (lock-tite the hardware, etc.) and you're good to go.
Stay warm out there (ha!).
Dan
--- On Wed, 2/27/13, Larry
Wrenches,
On an upcoming job we have a Xantrex XW4548 interconnecting with a 200A
service, and I'd very much appreciate some advice if y'all are willing.
Since the inverter output OCPD is required to be 60A we are looking at a
supply side connection, and I have two questions:
1.
Makes me wonder how many dual breakers I have taken the handle tie off and
used as singles in the past. It has been several, and none with no internal
connections that I could find or notice, with the exception of longer rivets
holding them together.
Granted it has been a while since I have don
On 2/27/2013 1:23 PM, bob ellison wrote:
Makes me wonder how many dual breakers I have taken the handle tie off
and used as singles in the past. It has been several, and none with no
internal connections that I could find or notice, with the exception
of longer rivets holding them together.
Hi Garrison,
In my opinion you only need to size the conductors to the overcurrent
protection. Bill Brooks addressed a similar question of mine a few months
ago - I've attached the email here. If you do a node analysis (ie see what
would happen under both normal operation and fault conditions at
There is an exception in NEC2011 regarding the point of connection. This may
not apply, but you could avoid the supply side. 4500W / 240V = 18.75 x 1.25 =
23.4A, well under the 120% rule. reference 705.12(D)(2)
Jeremy
All Solar
CO,USA
- Original Message -
From: Garrison Riegel
T
Thanks August. I couldn't get the attachment to open, but I see what you're
saying. You do bring up a good point about the AHJ as well. Few here have
seen solar, and fewer are familiar with 690 so anything out of the ordinary
usually gets flagged.
As Jeremy points out the 2011 NEC would allo
Jeremy,
Good point. Even under the 2008 NEC 690.64(B)(2) you can install up to a 40
Amp breaker on the load side as long as it is on the opposite side of the
input feed per 690.64(B)(7). Garrison, do you need a 60 A breaker?
I haven't used this product myself, but if the continuous output pow
August,
The 60A breaker is intended to allow grid power to pass through to
the loads in excess of the inverter's stand-alone output. The
point of 705.12 (moved in the 2011 NEC from 690.64 (B)(2)) is to
differentiate between load pass-through current and sell curre
Alan,
Thanks for the clarification. I believe you and Jeremy are talking about
the exception listed on the last paragraph of 705.12(D)(2). I've never used
that rule but it is good to know about. When we do battery backup we
typically route the critical loads through an external transfer switch
r
Larry:
I was tempted to advise against this. I see a similar concept with people
trying to parallel PV feeds and then putting two charge controllers at the
destination. Not good.
However, I see many 200 amp main breakers that are 4 100 amp breakers
ganged, with two for each phase. I can n
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