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<p>Jerry,</p>
<p> 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.</p>
<p>Bill</p>
<pre class="moz-signature" cols="72">Feather River Solar Electric
Bill Battagin, Owner
4291 Nelson St.
Taylorsville, CA 95983
530.284.7849
CA Lic 874049
<a class="moz-txt-link-abbreviated" href="http://www.frenergy.net">www.frenergy.net</a></pre>
<br>
<div class="moz-cite-prefix">On 3/17/2018 8:26 PM, Jerry Shafer
wrote:<br>
</div>
<blockquote type="cite"
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<div>Wrenches<br>
</div>
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.<br>
</div>
Jerry<br>
</div>
<br>
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