Magnum Energy MS Series Owner's Manual

Contents

Magnum Energy MS Series Owner's Manual Manual pdf 26 page image

© 2009 Magnum Energy IncPage 20Installation2.5 AC WiringThis section provides information on how to make the AC connections to the inverter using thecorrect AC wire size and corresponding overcurrent protection.2.5.1 Pre-AC Wiring RequirementsCAUTION: Before installing any AC wiring, review the safety information at thebeginning of this manual and the following to ensure a safe and long-lived system:Read all instructions and cautionary markings located at the beginning of this manualand in the pre-installation section, before installing the inverter and batteries.Always use properly rated circuit-breakers. If using an electrical sub-panel, circuitbreakers can be moved from the main electrical panel to the sub-panel only if thebreakers are also listed to be installed in the sub-panel.AC wiring must be no less than #10 AWG (5.3 mm2) gauge copper wire and beapproved for the application (i.e., residential, RV or Marine wiring).DO NOT connect the inverter’s output to an AC power source. This could causesevere damage to the inverter and is not covered under warranty.••••WARNING: To reduce the risk of fire, do not connect this inverter to an AC load center(circuit breaker panel) having multi-wire branch circuits connected.2.5.2 AC Wire Size and Overcurrent ProtectionThe AC input and output wiring must be sized per the local electrical safety code requirements toensure the wires ability to safely handle the inverter’s maximum load current. After determiningthe proper AC wire sizes, they are required to be protected from short circuits and overloads byan overcurrent protection device and have a means to disconnect the AC circuits.The MS Series provides a terminal block (see figure 2-10) that allows the AC input and output wiringto be permanently wired. This terminal block allows a service/distribution panel (main panel) tobe wired to the inverter’s input and a dedicated panel (sub-panel)1 between the inverter’s outputwiring and the AC loads. These systems use the circuit breakers provided in the panels as theovercurrent protection and the AC disconnect device.AC overcurrent protection is not included in the inverter and must be provided as part of theinverter installation. The AC overcurrent protection device must be a circuit breaker or a fuse/disconnect and be properly sized and branch circuit rated for the wire it is protecting and theappliances being powered.When in the Standby mode, the full AC continuous pass-thru capacity of the MS Series inverter/charger is 30 amps for each AC leg2 (AC HOT 1 and AC HOT 2), However the AC HOT 1 and AC HOT2 may be combined to obtain a 60 amps pass thru capability (see figure 2-12 for the SISO-60Aconfiguration). For a 30 amp continuous pass-thru capability, each AC HOT input to the inverterrequires a 30 amp continuous duty rated breaker3, which corresponds to a minimum cable sizeof #10 AWG4 in conduit. When tying the AC HOT 1 and HOT 2 together for a 60 amp continuouspass-thru capability, the AC input to the inverter requires a 60 amp continuous duty rated breaker3,which corresponds to a minimum cable size of #6 AWG4 in conduit. If you are using other circuitbreakers/wire sizes, refer to the appropriate electrical codes for proper sizing requirements.CAUTION: The inverter’s internal AC transfer relay contacts are rated for 30 amps(each leg), the pass-thru current for relay contact must be no greater than 30 ampsor damage to this relay may occur.Note 1 - Breaker models (-15B and -20B) do not require a dedicated inverter panel (i.e. sub-panel).Note 2 - On breaker models (-15B and -20B), the pass-thru current is limited by the output breaker size.Note 3 - The breaker must be derated by 80% if not rated for continuous duty. The NEC requires that circuitsare not to be operated continuously at more than 80% of rating unless listed with a 100% continuous rating.Note 4 - Copper wire should be rated with 90°C insulation at an ambient temperature of 30°C (86°F).