Instruction Manual

ManualsBrandsMidNite Solar ManualsBalance of System (BOS) - Electrical ComponentsMNPV2 1000V Combiner Box

MNPV2-1000, MNPV4-1000,

MNPV3 and MNPV6 Instructions

The MNPV3 and 6 combiners are rated for outdoor use. Designed for combining PV strings up to 150VDC and

120 amps total using breakers, or high voltage strings up to 600VDC using 10mm x 38mm fuses up to 80 amps

total (MNPV6). The use of touch safe din rail mount fuse holders and fuses allow operation up to 600 Volts.

The MNPV2-1000 and MNPV4-1000 are designed for 1000vdc strings using 1000 volt fuse holders

The MNPV6 combiner comes with two copper bus bars. One for circuit breakers and one for fuses.

The MNPV3 busbar is designed for circuit breakers or fuses. The MNPV3 busbar is rated for 60 amps total.

Applications:

 PV combiner up to six strings using MNEPV breakers rated for 150VDC. 120 amps total output

 PV combiner up to three strings using MNEPV breakers rated for 300VDC. 120 amps total output

 PV combiner up to four strings using 600VDC fuses and MNTS touch safe fuse holders rated for 600VDC

 DC load center using MNPV breakers

Features:

 All aluminum powder coated housing that won’t rust

 Flip up cover that can stay in the open position during installation

 PV Negative bus bar with 14 useable openings (10 #14-6 and 4#1/0-14)

 Chassis ground bus bar with 14 useable openings (10 #14-6 and 4#1/0-14)

 Standard din rail to mount up to 6 breakers or 4 fuse holders (MNPV6)

 Tin plated copper bus bar to combine breaker outputs (MNPV6 busbar may be split in two)

 Dead front cover snaps into place after wiring is complete for safety

 Knockouts for PV in and PV out on bottom and sides

 Top surface is available to bring conduit in from directly above the enclosure

Summary of content (8 pages)

PAGE 1
MNPV2-1000, MNPV4-1000, MNPV3 and MNPV6 Instructions The MNPV3 and 6 combiners are rated for outdoor use. Designed for combining PV strings up to 150VDC and 120 amps total using breakers, or high voltage strings up to 600VDC using 10mm x 38mm fuses up to 80 amps total (MNPV6). The use of touch safe din rail mount fuse holders and fuses allow operation up to 600 Volts.
PAGE 2
MNPV Instructions (continued) IMPORTANT SAFETY INSTRUCTIONS SAVE THESE INSTRUCTIONS! - These instructions contain important safety and operating instructions for the MidNite Solar MNPV2-1000, MNPV4-1000, MNPV3 and MNPV6 solar combiner boxes. If you do not fully understand any of the concepts, terminology, or hazards outlined in these instructions, please refer installation to a qualified dealer, electrician or installer.
PAGE 3
MNPV Instructions (continued) Installation The installation of a PV combiner is fairly straight forward. Select the location to install your combiner first. Some systems have the PV modules located close to the inverters and or battery system. If this is the case, you can elect to mount the MNPV inside and run each PV string down to the MNPV inside the house. This is convenient for trouble shooting and upgrading.
PAGE 4
MNPV Instructions (continued) Note: The plastic dead front fits very tight. You must first remove the lid in order to remove the deadfront. Remove the deadfront: Pry off the lid as shown using something like a screwdriver as a lever. The dead front will then come out easily. Torque –Fuseholder / Circuit Breaker QY Circuit breakers 20 in-lbs (2.3Nm) USM1 Fuseholders 15 in-lbs (1.7Nm) Torque – Terminal Bus Bar 10AWG 8AWG 6AWG 4AWG 2AWG – 1/0 MNPV6 shown with breakers & MNSPD Surge Suppressor 20 in-lbs (2.
PAGE 5
MNPV Instructions (continued) Circuit breaker selection. When selecting breakers for use with the MidNite combiners, first check with the PV manufacturer to determine the proper “series fuse”. The term fuse is used even though you are probably using breakers. This is a carryover from UL terminology. MidNite Solar offers PV combiner breakers rated at 150VDC and 300VDC. The 150V breakers come in these amp ratings. 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 12, 15, 20, 30, 40, 50, 60 and 63.
PAGE 6
MNPV Instructions (continued) Combiner wiring. Caution! Always ensure that the disconnect means is turned off. Never do any wiring or cleaning/maintenance while there is power in the combiner. Death, fire or serious injury can result. There are numerous ways to hook up a PV array. There are no “best” or “correct” ways to accomplish this. They all have merit.
PAGE 7
MNPV Instructions (continued) MNPV6-250 With (3) 300VDC Breakers installed This is a special configuration that is possible with the MidNite Solar Classic charge controller. Note that in order to use 300VDC breakers you will need the MNPV6-250 or the MNPV12-250 combiner. 300VDC breakers take up two spaces. The MNPV6-250 holds three 300VDC breakers. The MNPV12250 holds six 300VDC breakers.
PAGE 8
MNPV Instructions (continued) Typical install. The picture on the right is from Lance Barker. It shows an MNPV6 with a MidNite Solar DC-GFP installed inside along with two combiner breakers. This is a novel use of the DC-GFP in the combiner enclosure. The use of din rail mount breakers makes for real flexibility. 18” trenching is reduced to 12” when a DC-GFP is on the PV end of the trench. 2008 NEC article 300- wiring methods 300.5 page 70-129 , table 300.