[RE-wrenches] Arc Fault problem in FM100

[William Miller]

Dana:



With all due respect, the Flexmax 100 GFDI fuse is not that same as either
of the Fluke 87 fuses.



·        Per the Flemax 100 AFCI manual
<https://old.outbackpower.com/downloads/documents/charge_controllers/flexmax_100_afci/fm100_afci_manual.pdf>
June 2022, Revision C, page 20, the fuse is “600 Vdc, 0.75 Adc, OutBack
Power P/N SPARE-045”.  If you look closely at the photograph the fuse shown
is 1 amp.  My recollection is the fuse is 1 amp.



·        Per Fluke <https://www.fluke.com/en-us/products/accessories/fuses>
the fuses are 11A @ 1000V and 440 mA @ 1000V.  The photo of the 11 amp fuse
shows a Bussman DMM-11AR.  The photo of the 440 mA shows a Little Fuse
Fast-acting 44/100A



Unfortunately neither manufacturer gives the full specs for the fuses, at
least not that I can readily find.  The fuse activation timing (fast or
delay) is an important factor.  I am sure somewhere on the web are
cross-reference numbers to major fuse manufacturers.  Above I cite what is
seen in photographs but not specifically named in any specification table.



All of these fuses are expensive.  This is why if someone uses my 87 and
leaves the red lead plugged into either amp port they owe me a beer, and if
a fuse is blown, a replacement.



William



Miller Solar

17395 Oak Road, Atascadero, CA 93422

805-438-5600

www.millersolar.com

CA Lic. 773985





*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Dana Orzel via RE-wrenches
*Sent:* Thursday, March 13, 2025 6:31 AM
*To:* RE-wrenches
*Cc:* Dana Orzel
*Subject:* Re: [RE-wrenches] Arc Fault problem in FM100



It’s the same fuse as in a Flluke 87 😎

Dana Orzel - dana at solarwork.com - 208.721.7003



On Mar 12, 2025, at 8:13 PM, John Blittersdorf via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:



Dana, I'm the one feeling like an idiot.  Turns out the ground fault fuse
was blown in a brand new controller.  I did't have my

meter with me to test the fuse and had to go back the next day.  I had a
good fuse in the 2nd controller not yet hooked up so

I could have borrowed that one and had the system up and running. Only cost
me 4 hours of drive time by not having my meter.



John Blittersdorf





On Sat, Mar 8, 2025 at 11:32 AM Dana Orzel via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

Pull the ground jumper in the FM100.

Double check all terminal connections in the Power center related to the
FM100. Do the pull test carefully,

I once missed tightening a neutral that was passing current & then not. I
finally heard a slight crackle sound as I turned the array input & battery
breaker at the same time to on, did the pull test [moved wires & the Fm100
lite up], then Felt like an idiot! Tightened the neutral & all good.



_________________________________________________________

Dana Orzel                GREAT SOLAR WORKS!

C – 208.721.7003      E – dana at solarwork.com

W - www. greatsolarworks.com     www.solarwork.com

*“Responsible Technologies for Responsible People since 1988!”*



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