-wrenches re-wrenches@lists.re-wrenches.org
Sent: Tuesday, April 17, 2012 8:42 PM
Subject: Re: [RE-wrenches] GFP and multiple charge controllers
Friends:
Here is a related problem: If we use an 80 amp GFD (ground fault
detection) breaker, even for a very small array, we have to use 3AWG CU
wire from
Hi William,
I agree with you on the GFP.
There is a work around for the larger breaker size and that is to install a
prebreaker from the array then to the GFP breaker then to the CC.
You then get to work on the smallest breaker size for wiring, if my
understanding of the code is correct.
jay
William,
Square D used to make a QO breaker body without the overcurrent trip
mechanism. Internally it just had the switch contacts and it was
intended for use as a disconnect in locations where overcurrent
protection was already provided. The reason I mention this is that the
80-amp PV GFP
A lot of good replies have come by here but here goes another one...
The GFP cannot be used for dual purpose as a disconnect for battery
or PV input and you are not allowed to un-ground the system by turning
off the DC input or output breaker.
4 AWG should be fine for 80 amps. If you need/want
William,
There have been too many fires where GFP failed to operate correctly to
argue that they are really good at what they are supposed to do. But, I
think it is inappropriate to say they don't really work at all. How many
fires could have or would have happened without the GFP devices?
: Wednesday, April 18, 2012 5:08 PM
Subject: Re: [RE-wrenches] GFP and multiple charge controllers
A lot of good replies have come by here but here goes another
one...
The GFP cannot be used for dual purpose as a disconnect for
battery
or PV input and you are not allowed to un-ground
.
*From:* b...@midnitesolar.com b...@midnitesolar.com
*To:* RE-wrenches re-wrenches@lists.re-wrenches.org
*Sent:* Wednesday, April 18, 2012 5:08 PM
*Subject:* Re: [RE-wrenches] GFP and multiple charge controllers
A lot of good replies have come by here but here goes another one...
The GFP cannot
...@midnitesolar.com b...@midnitesolar.com
To: RE-wrenches re-wrenches@lists.re-wrenches.org
Sent: Wednesday, April 18, 2012 5:08 PM
Subject: Re: [RE-wrenches] GFP and multiple charge controllers
A lot of good replies have come by here but here goes another one...
The GFP cannot be used
Hi Kent,
I wanted to add a little more re positive grounding. OutBack's communication
structure, like many other manufacturers, is referenced to Negative. If you
install multiple devices in a positive ground system and connect them together
via a Hub and add disconnects/overcurrent protection
Here is Robin's 2 cents worth on this subject
In a PV input circuit to a charge controller that has a 63 or 80 amp
DC-GFP, it is perfectly legal to use a small wire. That is because you
will also have the appropriate sized breaker in series with the DC-GFP
breaker. If you want to use
Phil,
While using a dual GFDI to open both positive and negative array
conductors is the safest thing to do in battery systems, and it is
clearly compliant with 690.5 to do so, it is not consistent with the
manufacturer's instructions or the device listing. So that leads back to
a violation
Wrenches,
In a job coming up I have a customer with an existing FM60 controller, 520
watt (!!) array. We are doing a ton of work, including adding a 4 kW solar
array with Classic 150 charge controller. I am trying to figure out how to
handle the GFP.
For the Classic, I need a 90 or 100 A
Nathan,
I don't think anyone makes a 100-amp PV GFP. The panel mount breaker
model that's being used for the PV GFP doesn't include a 100-amp breaker.
The Classic has a built-in GFP so you shouldn't need an external GFP for
it. You will need to add a GFP for the FM60 - a single 80-amp GFP
Friends:
Here is a related problem: If we use an 80 amp GFD (ground fault
detection) breaker, even for a very small array, we have to use 3AWG CU
wire from the battery buss to the breaker and from the breaker to the FM or
MX60. This seems like a big hassle for 5 or 10 amps of charging. A
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