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Page 1 of 7 10-055-1 REV E Date: 08/27/2018

SURGE PROTECTIVE DEVICE INSTALLATION MANUAL

The MidNite Solar Surge Protective Device (MNSPD) is a Type 1 device, designed for

indoor and outdoor applications. Engineered for both AC and DC electric systems, it

protects both transformer and transformer-less inverters without interfering with the GFP

protection circuit, it provides protection to service panels, load centers or where the SPD is

directly connected to the electronic device requiring protection. Maximum protection will

only be achieved if the SPD is properly installed. Please read the following installation

manual carefully and follow the instructions.

UL Standard for Safety, UL 1449

CSA C22.2 No. 8-M1986

Summary of content (7 pages)

PAGE 1
Page 1 of 7 10-055-1 REV E Date: 08/27/2018 SURGE PROTECTIVE DEVICE INSTALLATION MANUAL UL Standard for Safety, UL 1449 CSA C22.2 No. 8-M1986 The MidNite Solar Surge Protective Device (MNSPD) is a Type 1 device, designed for indoor and outdoor applications.
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Page 2 of 7 10-055-1 REV E Date: 08/27/2018 The MidNite Solar SPD is offered in three different voltages to maximize the required protection level. Protection is achieved by reducing the clamping voltage to a safe voltage that your system can sustain without damaging any electronics in the system. By using the chart on page 2 select the SPDs that provide the protection your system requires. The maximum operating voltage of the SPD must be higher than the system voltage.
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Page 3 of 7 10-055-1 REV E Date: 08/27/2018 DANGER: Electrical shock or burn hazard. Installation of this SPD should only be done by qualified personnel. Failure to lockout electrical power during installation or maintenance can result in fatal electrocution or severe burns. CAUTION: Check to make sure system voltages do not exceed the SPD voltage requirement and the correct SPD voltage/model has been selected.
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Page 4 of 7 10-055-1 REV E Date: 08/27/2018 1) This product contains No Serviceable Parts. 2) USE SUPPLY WIRE SUITABLE FOR 90° C. The conductors used to connect the SPD to the line or bus shall not be any longer than necessary and shall avoid unnecessary bends Use screw, washer, nut & ring terminal on MNPV Combiner. Fig. 1.2 PV PLUS BUS (Red wire) AC IN (black/red) )wire) Fig 1.
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Page 5 of 7 10-055-1 REV E Date: 08/27/2018 Three Phase wiring. Midnite SPDs can be used for 3 phase applications. As shown in the diagram, two or three SPDs can be used. L3 L1 GND L2 Two SPDs provide basic protection. L3 Three SPDs provide enhanced protection.
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Page 6 of 7 10-055-1 REV E Date: 08/27/2018 Fig 1.5 In a utility connected home, one of the most vulnerable points of entry is the service entrance panel. All house wiring connects to the service entrance panel and therefore everything plugged in is at risk. The MidNite SPD300AC provides protection against near lightning strikes up to 100,000 amps of surge current. Hooking up to the service entrance can be done in a few different ways. Figure 1.
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Page 7 of 7 10-055-1 REV E Date: 08/27/2018 Figure 1.7 shows a more economical method to connect the SPD to the service entrance distribution panel. This installation utilizes a 240V breaker that is already in use. This could be a deep well pump, air conditioner etc. Unless the circuit breaker is listed to have two wires connected, you must pigtail the wiring as shown. Breakers that are listed for two wires are very rare, so this method of installing the SPD is probably your best bet. Fig 1.