– User and Installation Manual
7 PARALLEL AND SPLIT-PHASE SYSTEMS
7.1 General information
The information in this chapter is intended for qualified personnel. The installation should be
performed by a Certified Electrical Technician to ensure a safe and trouble-free installation.
To keep the drawings in this chapter clear and easy to read, the cable lengths have not
been drawn in proportion to each other. Use AC cables of equal gauge and length and use
DC cables of equal gauge and length, to every unit in the multi-unit configuration!
There are several reasons for a multi-unit configuration:
• If more output power is needed than one unit can supply.
• If 240V is needed. Two CombiMaster Inverter/Charger units can be connected in a split-phase
configuration to deliver 240V for high-power loads like air-conditioning. Connecting two more
units in parallel as well, increases the split-phase power.
Maximum system configuration:
Single-phase
parallel
Up to 3 units:
Up to 7 units:
Up to 7 units:
Up to 7 units:
Split-phase
2 units:
2 units:
2 units:
2 units:
Split-phase with 2
units in parallel
2x2 units:
240V/14kW
or 7kW per
2x2 units:
240V/14kW
or 7kW per
2x2 units:
240V/18kW or
9kW per phase
2x2 units:
240V/20kW or
10kW per phase
Notes:
- Only CombiMaster Inverter/Charger units of the same model, with the same product code and
same firmware version, can be used for parallel or split phase operation.
- Install the units close to each other (no more than 1ft apart) to prevent ground loops!
- Preferably, install the units next to each other rather than above each other, to prevent thermal
influence.
- It is best practice to label the units (e.g. Primary, Replica1, Replica2) and L1 and L2.
- Use ONE battery bank whose capacity is suitable for the application!
- If single point neutral to ground bonding is required, please refer to the related Technical
Bulletin. Technical Bulletins are published on the portal on the Mastervolt website.
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