[RE-wrenches] fusing requirement for 4 strings run to a Inverter with 2 MPPT's

Brian Teitelbaum bteitelbaum at aeesolar.com
Wed Jan 27 17:31:22 PST 2016


Al,



As long as you only have a max of two strings going into each of the
separate MPPT channels, no string fusing is needed. So with four strings,
two on each MPPT input channel in the inverter, no string fusing is needed.
This is one of the big advantages to having multiple MPPT channels in GT
inverters.



No need to run separate conduits either. All four PV string circuits can be
run in a single conduit, as long as the conduit is properly sized for wire
fill, of course.





Brian Teitelbaum

AEE Solar





*From:* RE-wrenches [mailto:re-wrenches-bounces at lists.re-wrenches.org] *On
Behalf Of *Allen Frishman
*Sent:* Wednesday, January 27, 2016 6:12 AM
*To:* re-wrenches at lists.re-wrenches.org
*Subject:* [RE-wrenches] fusing requirement for 4 strings run to a Inverter
with 2 MPPT's



Wrenchers,

What is the requirement for fusing 2 strings per MPPT?     Specifically for
an inverter like the Fronius Primo that has no integrated fuses.    If you
run 2 strings to each MPPT do you need to fuse each string?    In this case
there is a total of 4 strings which would need to be fused if using a
single mppt.



If the home runs are run in separate conduits from the array to limit the
strings in the conduit to 2 per you still have all 4 strings together in
the inverter.



All thoughts and feedback are appreciated.

*Al Frishman*
AeonSolar

*(917) 699-6641 <%28917%29%20699-6641> - cell*
*(888) 460-2867 <%28888%29%20460-2867>*
*www.aeonsolar.com <http://www.aeonsolar.com/>*
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