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-boun...@lists.re-wrenches.org] *On Behalf Of *Allen Frishman *Sent:* Wednesday, January 27, 2016 6:12 AM *To:* re-wrenches@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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