HV Disconnecting Combiner Manual

MNPVHV Disco Instructions (continued)
5 | P a g e 1 0 - 065- 1 R E V : J
Caution! Do not disconnect any cables under load. Remove power prior to connecting or disconnecting any
cable connections. If necessary, cover the solar panels with opaque material to remove power.
Extremely bad things Will happen if connections are opened under load.
Recommended torque values.
These values apply to all the bus bars
and the Plus output box lug up to 2/0.
Re-torque fuse holders after one hour.
The MidNite MNPVHV combiners utilize touch safe fuse holders and fuses
rated for up to 600 volts DC. The MNPV8HV can accommodate eight USM1
type fuse holders made by Ferraz Shawmut or other compatible fuse holders.
Fuses are available from 1 to, 30 amps. (The combiners come with 15 amp
fuses installed except special built).
Do not open the fuseholders under load.
You WILL have a fire on your hands!
Enclosure Notes:
In order to ensure water-tightness on Type 4X units and rain-tightness on the Type 3R units it is important to
install connectors or hole plugs into every opening. Silicone sealant can be used to plug all openings on Type 3R
units except for the two 1/8” drain holes on the bottom.
On Type 4X units two 1/8” drain holes can be placed at the lowest point on the enclosure. The enclosure will not
be as water-tight, but this will give any condensation that may build up a way out of the enclosure.
Torque –Fuseholder
USM1 Fuse holder 15 in-lbs (1.7Nm)
Torque – Terminal Bus Bar
10AWG 20 in-lbs (2.3Nm)
8AWG 25 in-lbs (2.8Nm)
6AWG 35 in-lbs (4.0Nm)
4AWG 45 in-lbs (5.1Nm)
2AWG – 1/0 50 in-lbs (5.6Nm)
Ferraz Shawmut
USM1 Touch Safe fuseholder
Midnite Solar part number - MNTS
MNPV16HV Type 4X bottom Shown with plugs
Tighten firmly with tool available
from MidNite Solar
Torque – Various Screws/Bolts
8-32 20 in-lbs (2.3Nm)
¼-20 80 in-lbs (9.1Nm)
Torque – Large Box Lug
300 MCM 275 in-lbs (23.1 NM)