This article provides an installation, configuration, and operational summary for the GivEnergy EMS (Energy Management System) – GIV-EMS-V1.
It condenses the official manual into a field-ready reference for installers working with
multi-inverter AC-coupled systems.
System Overview
The GivEnergy EMS allows up to three AC-coupled inverters and up to six EM115 / OB115 / GEM120 Modbus meters to operate together as a single coordinated plant.
The EMS balances battery usage, manages inverter discharge behaviour,
and provides a unified data stream so installers and customers can view total system performance in the Portal.
- Max inverters: 3
- Max meters: 6
- Supported inverter type: AC Coupled (single-phase), Firmware D0.291–A0.282
- Operating voltage: 5 VDC
- Self-consumption: <10 W
- Protection class: IP20
- Temperature range: −20°C to 60°C
How the EMS Operates
The EMS manages AC-coupled plant behaviour based on battery State of Charge (SOC):
- When all batteries are within 1% SOC difference, the EMS commands all inverters
to discharge evenly.
- When SOC difference exceeds 1%, the EMS prioritises the inverter with the highest SOC to supply load or grid balance.
- During charge periods, all inverters are instructed to charge at full power.
Hardware Overview
Communication Ports
The EMS includes:
- RS485-1: Grid meter(s) + 1 inverter
- RS485-2: Solar / generation meter(s) + 1 inverter
- RS485-3: Load meter(s) + 1 inverter
- RS485-4: Reserved for future use
- CAN-1 / CAN-2: Not used for AC Coupled EMS plant
Antenna Ports
- WiFi antenna: Required for wireless communication
- 4G LTE antenna: Optional mobile connectivity
Dip Switches
- SW2: Selects WiFi mode or LAN mode
- SW4: Resets WiFi module to factory settings
LED Status Indicators
The EMS uses two LEDs:
| LED State | Meaning |
|---|
| Slow green flash | Normal operation (EMS online) |
| Green/Red flashing | Waiting for network connection |
| Solid red | Error state (check Section 7) |
| Slow blue flash (LED2) | WiFi waiting for connection |
| Fast blue flash (LED2) | Initialising / RTC not set |
Communication Cabling
Each RS485 port supports 1 inverter + up to 2 Modbus meters using ID1 → ID2 addressing.
- Grid meters must be connected to RS485-1
- Generation meters must be connected to RS485-2
- Load meters must be connected to RS485-3
- Maintain correct polarity (A+ / B–)
- Check that meters output 3.6–10 V on RS485 (faulty meters may output 0 V)
After cabling, add the EMS to the customer’s Portal account before commissioning.
Network Setup
WiFi Mode
- Wait for LED2 to slow-flash blue.
- Connect to the EMS WiFi hotspot (SSID = EMS serial number).
- Open 10.10.100.254 in a browser.
- Select STA Mode and search for the customer’s WiFi network.
- Enter password → Apply → Restart device.
LAN Mode
- Set SW2 to LAN.
- Connect EMS to router via Ethernet.
- Device will use DHCP unless a static IP is required.
The EMS Portal page displays:
- Total system load
- Total battery power
- Grid import/export
- Combined SOC
Individual inverter pages show battery cell data, inverter power, and per-inverter load readings.
Remote Control & Firmware Settings
Before performing any firmware updates, ensure the following inverter settings are applied:
- Charge time: 00:00–24:00
- Discharge time: 00:00–24:00
- Meter type: CT
- ECO Mode: OFF
- AC Charge: OFF
- Enable DC Discharge: OFF
Update each inverter to:
Restart the inverter after updates, then complete EMS setup.
EMS Settings
- Off-Peak Charge Times: Configure charge periods
- Enable Plant Mode: Allows coordinated control of multiple inverters
- Set RTC: Required for correct operation (press Send, then restart EMS)
- Timed Export: Allows export control via schedule
- Export Limit (W): Set plant-wide export power
Error Codes
| Code | Description | Action |
|---|
| 0x0000 | No error | — |
| 0x0001 | Generation meter communication failed | Check wiring |
| 0x8000 | RTC invalid | Set EMS time/date |
| 0x8001 | Grid meter communication failed | Check connection |
| 0x8002 | All inverters lost | Check cabling |
| 0x0002 | Single inverter lost | Check inverter connectivity |
| 0x8003 | Configuration mismatch | Ensure meter/inverter count matches settings |
Troubleshooting
- Meter communication fail: Check RS485 polarity and continuity.
- Inverter cannot discharge: Check inverter charge/discharge time settings.
- Grid Port Monitor error: Check comms cable between inverter and EMS.
- Firmware update stuck: Restart EMS and reattempt upgrade.
- EMS cannot detect multiple inverters: Check wiring and ensure the first meter is ID1.
Additional Notes
- EMS requires a 240 V source via the included 240→5 V adapter.
- Initial inverter/meter discovery may take up to 4 minutes.
- Do not repeatedly restart the EMS during initialisation.
Warranty
The EMS includes a 2-year warranty.
For missing or damaged parts, or suspected hardware faults, contact GivEnergy Support.