[RE-wrenches] Fuses

[frenergy]

Jerry,

             I've had several 12 amp Bussman fuses fail in a combiner 
box serving PVs that SC at 9.9 amps.  They always seemed to be the 
bussman version that was made in India, labeled SOLAR PV PV-15A10F.  I 
didn't notice if it was always the negative fuse.  I find myself 
replacing those with 15 amp fuses though it seems unlikely that some 
cold day, edge-of-cloud, solar noon, clean PV glass perfect scenario 
would cause the amps to climb to 12+ amps. In some of the installs, that 
would never be the case.

Bill

Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
www.frenergy.net


On 3/17/2018 8:26 PM, Jerry Shafer wrote:
> Wrenches
> I have a question that I do not have an answer for that I can prove, 
> here it is, I have 25 ABB 20 k. three phase inverters on a .5 meg 
> ground mount site , I have also seen this on systems with SMA tripower 
> and Fronius 8.2 and trio inverters on roof mounted systems, 
> intermittently one combiner will blow a fuse and 9 times out of 10 it 
> will be a negative fuse. PPA holders or CFO's of these systems would 
> like to know why and other than a wake up surge or shade issue which 
> could effect the negative side but that's really a stretch to say for 
> sure. We have sites located in dry and wet locations around the 
> islands, we have different brands of inverters but the fuses are what 
> the inverter manufacture included in their combiner/switches. I am 
> proposing to only use a slow blow fuse in the future with all of our 
> new systems regardless of what is included in the combiners but with 
> hundreds of fuses out there its a tough call to replace as they fail 
> or just for it and change them all in advance per site. I Look forward 
> to your thoughts and ideas, maybe its something else altogether.
> Jerry
>
>
> _______________________________________________
> List sponsored by Redwood Alliance
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change listserver email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out or update participant bios:
> www.members.re-wrenches.org
>

-- 



---
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches_lists.re-wrenches.org/attachments/20180318/c7a63c39/attachment.htm>