EPever IP-Plus Inverter

Modbus RTU

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Last updated: 03. 2026

EPever Official Website

The EPever IPower-Plus is a pure sine wave off-grid inverter available in models from 350 W to 5000 W. It communicates with TapHome via Modbus RTU over an RS-485 connection using an RJ45 connector. The TapHome template provides AC load power monitoring and inverter on/off control, along with configurable battery voltage/current protection thresholds and AC output settings.

The template covers the entire IP-Plus series — all models from IP350-Plus through IP5000-Plus share the same Modbus register map.

The IP-Plus is strictly an off-grid inverter. It must never be connected to the mains grid. Only stand-alone operation is permitted — parallel or series connection of multiple units is not supported.

Hardware connection

RS-485 via RJ45

The inverter uses an RJ45 connector for RS-485 communication. Connect to TapHome using a standard Ethernet cable with the following pin assignment:

RJ45 Pin	Function	Connect to TapHome
1, 2	+5 V DC (200 mA)	Not used
3, 4	RS485-B	B-/D-
5, 6	RS485-A	A+/D+
7, 8	GND	GND

The GND connection (pins 7, 8) is mandatory for reliable communication. Without a common ground reference, Modbus communication will be unstable or fail entirely.

Communication isolation is only available on 48 V input models. The 12 V and 24 V models have no communication isolation between the RS-485 port and the inverter’s DC input.

Configuration

Modbus communication parameters

Parameter	Value
Baud rate	115200 (configurable to 9600 via LCD menu “BRS”)
Data bits	8
Parity	None
Stop bits	1

Slave ID

The EPever documentation states the default Modbus slave ID is 3, but the TapHome template ships with slave ID 1. After importing the template, verify and adjust the slave ID in TapHome module settings to match the actual inverter configuration — or change the inverter’s slave ID to 1 using EPever’s configuration tools.

Remote control

The inverter must be in remote control mode before TapHome can switch it on or off. The TapHome template handles this automatically — the module initialization script writes 1 to coil register 0x11 (Local/Remote control) on startup. If remote control is manually disabled on the inverter, the template displays a “Remote control is disabled” warning in TapHome.

Device capabilities

AC load monitoring

The AC Load device is a sensor that reports the inverter’s AC output power in kW. The value is calculated from two 16-bit input registers (0x310E and 0x310F) combined into a 32-bit Little Endian value. Two service attributes provide additional detail:

Load output voltage — AC voltage delivered to the connected loads
Load output current — AC current drawn by the connected loads

Inverter power control

The Inverter ON/OFF device is a switch that turns the inverter output on or off via coil register 0x0F. A service action allows manually re-enabling remote control mode if needed.

Monitoring and protection thresholds

The module exposes 13 service attributes at the module level for monitoring and configuration:

Monitoring:

Load input voltage — battery-side DC input voltage
Device temperature and Heat sink temperature — internal thermal monitoring

Voltage/current protection thresholds (read-only):

Low input voltage — over-discharge immediate disconnect threshold
High input voltage — over-voltage immediate disconnect threshold
High input current and High input current recovery — over-current protection thresholds

Voltage protection thresholds (adjustable via service actions):

Low input voltage (5s) — over-discharge disconnect with 5-second delay
Low input voltage recovery — voltage at which the inverter recovers from over-discharge
High input voltage recovery — voltage at which the inverter recovers from over-voltage
High input voltage (5s) — over-voltage disconnect with 5-second delay

AC output settings (adjustable via service actions):

Output AC voltage setting — 220 V or 230 V (220 V system) / 110 V or 120 V (110 V system)
Output AC frequency setting — 50 Hz or 60 Hz

Changing the AC output voltage or frequency causes the inverter to restart automatically. Connected loads will experience a brief power interruption.

Status monitoring

The module ReadScript continuously monitors the inverter status register (0x3202) and the over-temperature discrete register (0x2000). TapHome displays warnings and errors for the following conditions:

Standby mode, faults, output failure
High voltage side short-circuit, input over-current
Abnormal output voltage, unable to discharge/stop discharging, short-circuit
Device over temperature
Load level (medium, nominal, overload)
Input voltage status (low, high, no connection)

Additional capabilities

The inverter also exposes registers for DC input current (0x3109) and DC input power (0x310A–0x310B) monitoring. A power saving mode coil (0x04) exists but is only supported on the SHI series. These can be added in a future template update.

Troubleshooting

No Modbus communication

Verify the RJ45 cable is properly seated in the inverter’s RS-485 port
Check pin assignment — pins 3, 4 (RS485-B) to B-/D- and pins 5, 6 (RS485-A) to A+/D+ on TapHome
Confirm the GND connection (pins 7, 8) is wired to TapHome ground
Verify the baud rate matches — the inverter defaults to 115200 bps
Check the slave ID — the inverter defaults to 3, the TapHome template defaults to 1

“Remote control is disabled” warning

The template initialization script enables remote control automatically. If this warning appears:

Check that the inverter is powered on and communicating
Use the Enable Remote control service action on the Inverter ON/OFF device
If the warning persists, verify that no other Modbus master is writing to coil 0x11

Inverter error codes on the LCD

Code	Fault	Resolution
ILV	Input low voltage	Check battery voltage — must be above 10.8 V (12 V) / 21.6 V (24 V) / 43.2 V (48 V)
IOV	Input over voltage	Check battery/charge controller voltage — must be below 16 V (12 V) / 32 V (24 V) / 64 V (48 V)
OOL	Output overload	Reduce connected AC loads, restart inverter
OSC	Output short circuit	Check load wiring, clear faults via TapHome service action or restart
OTP	Over temperature	Improve ventilation, wait for cooldown, restart

The Clear the faults service action in TapHome writes to coil register 0x13 and clears both current and historical faults, resuming normal operation without needing to physically restart the inverter.

Available devices

EPever IP-Plus Module

Service Attributes

Load input voltage	Battery-side DC input voltage to the inverter
Device temperature
Heat sink temperature
Low input voltage	Over-discharge immediate disconnect threshold — read-only, cannot be modified
Low input voltage (5s)	Over-discharge disconnect threshold with 5-second delay — adjustable via service action
Low input voltage recovery	Voltage at which the inverter recovers from over-discharge protection
High input voltage recovery	Voltage at which the inverter recovers from over-voltage protection
High input voltage (5s)	Over-voltage disconnect threshold with 5-second delay — adjustable via service action
High input voltage	Over-voltage immediate disconnect threshold — read-only, cannot be modified
High input current	Over-current protection threshold — read-only, cannot be modified
High input current recovery	Current at which the inverter recovers from over-current protection — read-only
Output AC voltage setting	AC output voltage — 220/230 V or 110/120 V depending on system. Inverter restarts after change
Output AC frequency setting	AC output frequency — 50 Hz or 60 Hz. Inverter restarts after change

Service Actions

Set Low input voltage - 5s
Set Low input voltage recovery voltage
Set High input voltage recovery voltage
Set High input voltage - 5s
Set Output AC voltage	Set AC output voltage — 220 V or 230 V (220 V system) or 110/120 V (110 V system). Inverter restarts after change
Set Output AC frequency	Set AC output frequency — 50 Hz or 60 Hz. Inverter restarts after change
Clear the faults	Clears current and historical faults and resumes normal inverter operation

IP-Plus

Read (module)

if(modbusr(D, 0x2000, bool), ADDWARNING("Device over temperature"));

var stat := modbusr(A,0x3202,Uint16);

if(!getbit(stat, 0), ADDWARNING("Standby"));
if(getbit(stat, 1), ADDWARNING("Faults"));
if(getbit(stat, 5), ADDWARNING("Output fail"));
if(getbit(stat, 6), ADDWARNING("High voltage side short-circuit"));
if(getbit(stat, 7), ADDWARNING("Input over-current"));
if(getbit(stat, 8), ADDWARNING("Abnormal Output voltage"));
if(getbit(stat, 9), ADDWARNING("Unable to stop discharging"));
if(getbit(stat, 10), ADDWARNING("Unable to discharge"));
if(getbit(stat, 11), ADDWARNING("Short-circuit"));

if getbits(stat,12,2) = 0x01
    ADDINFO("Medium load");
elseif getbits(stat,12,2) = 0x02
    ADDINFO("Nominal Load");
elseif getbits(stat,12,2) = 0x03
    ADDERROR("Overload");
end

if getbits(stat,14,2) = 0x01
    ADDWARNING("Low input voltage");
elseif getbits(stat,14,2) = 0x02
    ADDWARNING("High input voltage");
elseif getbits(stat,14,2) = 0x03
    ADDWARNING("No connect to the input power, etc.");
end

Service Attributes

Load input voltage [V]

modbusr(A, 0x3108, Uint16) / 100

Device temperature [℃]

modbusr(A, 0x3111, Int16) / 100

Heat sink temperature [℃]

modbusr(A, 0x3112, Int16) / 100

Low input voltage [V]

modbusr(H, 0x902F, Uint16) / 100

Low input voltage (5s) [V]

modbusr(H, 0x9030, Uint16) / 100

Low input voltage recovery voltage [V]

modbusr(H, 0x9031, Uint16) / 100

High input voltage recovery voltage [V]

modbusr(H, 0x9032, Uint16) / 100

High input voltage (5s) [V]

modbusr(H, 0x9033, Uint16) / 100

High input voltage [V]

modbusr(H, 0x9034, Uint16) / 100

High input current [A]

modbusr(H, 0x9035, Uint16) / 100

High input current recovery [A]

modbusr(H, 0x9036, Uint16) / 100

Output AC voltage setting [A]

modbusr(H, 0x9022, Uint16) / 100

Output AC frequency setting [Hz]

modbusr(H, 0x9023, Uint16) / 100

Service Actions

Set Low input voltage - 5s

Parameters: Voltage (1–100 V)

modbusw(H, 0x9030, Uint16, round(V * 100))

Set Low input voltage recovery voltage

Parameters: Voltage (1–100 V)

modbusw(H, 0x9031, Uint16, round(V * 100))

Set High input voltage recovery voltage

Parameters: Voltage (1–100 V)

modbusw(H, 0x9032, Uint16, round(V * 100))

Set High input voltage - 5s

Parameters: Voltage (1–100 V)

modbusw(H, 0x9033, Uint16, round(V * 100))

Set Output AC voltage

Parameters: Voltage

modbusw(H, 0x9022, Uint16, round(V * 100))

Set Output AC frequency

Parameters: Frequency

modbusw(H, 0x9023, Uint16, round(Hz * 100))

Clear the faults

modbusw(C, 0x13, bool, 1)

AC Load Variable Read-only

AC output power in kW — combines two registers into a 32-bit value for precise power measurement

Service Attributes

Load output voltage	AC output voltage delivered to the load
Load output current	AC output current drawn by the load

Inverter ON/OFF Switch

Turns inverter output on or off — requires remote control to be enabled (handled automatically by the template)

Values / States: ON · OFF

Service Actions

Enable Remote control

Enables remote control mode — required before inverter ON/OFF commands work

Inverter ON/OFF

Read switch state

MODBUSR(C, 0xf, Bool)

Write switch state

MODBUSW(C, 0xf, Bool, St)

Read (module)

if (!MODBUSR(C, 0x11, Bool), ADDWARNING("Remote control is disabled"))

Initialize

#enable Remote control
modbusw(C, 0x11, bool, 1)

Service Actions

Enable Remote control

MODBUSW(C, 0x11, Bool, 1)

Connection: Modbus RTU • 115200 baud• 8N1 • Slave ID: $[SlaveId]

Possible improvements (3)

A:0x3109 Load input current — DC input current (A). May always read 0 on some hardware models that don't support it
A:0x310A+0x310B Load input power — DC input power (W), 32-bit LE. Could complement the AC output power device
C:0x04 Power saving mode enable — Only SHI series supports this — other products do not support it

Download Template

Sources

Inverter Communication Protocol V1.0 — Modbus Register Map
2026-03-27
PDF
IPower-Plus Series User Manual V3.3
solarv.de 2026-03-27
PDF