How to Connect Felicity Inverters in Parallel for More Power
When a single inverter cannot handle your total load, connecting two or more identical units in parallel multiplies your power capacity. The Felicity IVPS series supports up to 6 units in parallel, delivering up to 60kVA from a single battery bank. Here is how to do it correctly.
What Is Parallel Operation?
In parallel mode, multiple inverters share the same battery bank and synchronise their AC output. Each unit carries an equal share of the load. If one unit fails, the others continue operating at reduced capacity.
Requirements for Parallel Operation
- Identical models: All units must be the exact same model and firmware version
- Parallel communication cable: Supplied with the inverter or ordered separately
- Shared battery bank: All inverters connect to the same battery bank
- Equal cable lengths: Battery cables to each inverter should be the same length and gauge
- Common AC bus: AC outputs connect to a common distribution board
Step-by-Step Parallel Setup
Step 1: Mount All Inverters
Install inverters side by side on the same wall, with 10-20cm spacing between units for airflow. All units should be at the same height.
Step 2: Connect the Parallel Communication Cable
Connect the communication cable between the parallel ports of each inverter. This cable synchronises the AC output waveform and manages load sharing.
Step 3: Configure Master/Slave
Set one inverter as "Master" and the others as "Slave" using the LCD menu. The master controls the system — all configuration changes are made on the master unit.
Step 4: Connect Battery Cables
Run individual battery cables from each inverter to a common bus bar, then from the bus bar to the battery bank. Use identical cable lengths and sizes. Install a DC fuse for each inverter.
Step 5: Connect Solar Panels
Each inverter's built-in MPPT can have its own solar array, or you can connect all panels to the master unit's MPPT only. Independent solar inputs per inverter are recommended for maximum harvest.
Step 6: Connect AC Output
Wire each inverter's AC output to a common bus bar or distribution board through individual AC breakers. The inverters synchronise automatically to produce a single unified AC output.
Step 7: Power On and Test
- Power on the master first, then each slave one at a time
- Verify all units show "Parallel" mode on their displays
- Apply a test load and confirm load sharing is balanced across all units
- Check that each unit's output current is approximately equal
Example: 2x Felicity IVPS 5kVA in Parallel
| Parameter | Single Unit | 2 Units Parallel |
|---|---|---|
| Continuous power | 5,000W | 10,000W |
| Surge power | 10,000W | 20,000W |
| MPPT capacity | 4,500W | 9,000W |
| Battery bank | 48V shared | 48V shared |
Common Issues and Solutions
- Uneven load sharing: Check cable lengths are equal and communication cable is properly connected
- One unit shows fault: Verify firmware versions match on all units
- AC output unstable: Ensure communication cable is not damaged or loose
Frequently Asked Questions
How many Felicity IVPS inverters can I connect in parallel?
Up to 6 Felicity IVPS units can be connected in parallel, providing up to 60kVA of combined power from a shared 48V battery bank. All units must be the exact same model and firmware version.
Can I parallel different models or brands of inverters?
No. You can only parallel identical models from the same manufacturer. Mixing different models or brands will cause synchronisation failures and potential equipment damage.
Do I need separate solar arrays for each parallel inverter?
It is recommended but not required. Each inverter's built-in MPPT can have its own solar array for maximum harvest. Alternatively, you can connect all panels to one unit's MPPT, but this limits total solar input to that unit's controller capacity.
