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
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