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Multi-MPPT inverters get the most from 12 strings with the MidNite Solar MNPV4BY3 combiner, which keeps them in three independent groups of four. Each group feeds its own MPPT input, so the inverter tracks each one separately. MidNite names the EG4 12000XP as one suitable inverter.
Grid-tied or off-grid arrays feeding a three-MPPT inverter or three separate charge controllers, including sloped-roof mounting up to 14 degrees from vertical.
About the MidNite Solar 12 String 3 Output Combiner The MidNite Solar MNPV4BY3 is a 12-string PV combiner built for inverters and charge controllers with multiple MPPT inputs. Instead of combining all 12 strings down to a single output like a standard combiner, this box keeps strings separated into three independent groups of four. Each group feeds its own MPPT input, which means the inverter can track each group independently for maximum harvest. This is the right combiner for multi-MPPT inverters like the EG4 12000XP or any system distributing strings across three separate charge controllers. Fusing and Overcurrent Protection The combiner includes 12 DIN rail-mounted touch-safe fuse holders loaded with 30A fuses (10x38mm). The touch-safe design meets IEC finger-safe standards, allowing fuse replacement without exposing live terminals. Each fuse holder accepts #14 to #6 AWG conductors on the string input side. Individual string fusing means you can isolate a single string for troubleshooting or maintenance without shutting down the entire array. Independent Outputs and Busbars Three separate 120A tin-plated copper busbars each combine four strings into one output. Critically, each group also has its own independent negative busbar, so positive and negative returns stay separated per MPPT input without needing external negative combining. Output terminals on each busbar accept #6 to #2/0 AWG cables, sized for the combined current of four parallel strings. A chassis ground busbar accepts conductors up to #1/0 AWG for equipment grounding. Enclosure and Installation The NEMA 3R powder-coated aluminum enclosure is rated for outdoor installation. A plastic deadfront covers all live terminals after wiring, providing additional protection against accidental contact. The enclosure mounts vertically or at angles up to 14 degrees from vertical for sloped roof installations. Twelve strain reliefs are included for incoming PV cables, and multiple knockout configurations on the bottom and side panels accommodate both individual string entries and larger conduit runs to the inverter. Certifications and Warranty The combiner is SGS Listed to UL 1741 for USA and Canada, covering use in systems up to 1000VDC for both grid-tied and off-grid applications. MidNite Solar manufactures it in Arlington, Washington with a 5-year warranty.
Warranty terms mentioned in this description are the manufacturer’s. Our own coverage is the 30-day limited warranty.
We confirm compatibility, installation requirements, and delivery details with you during order review, before any payment. Home electrical work may require a qualified installer.
Our team can check that the 12-string, 3-output layout matches your inverter's MPPT inputs. Message our team on WhatsApp.
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