Why does battery power read zero or show garbage values?

Register 33149 (power_mul_a) is a signed 32-bit value spanning addresses 33149 and 33150. Reading only 33149 as 16-bit produces incorrect results. Confirm the template type is set to uint32 and the Gateway is reading the full two-register block. Cross-check sign with register 33135 (power_mul_b): 0 means charging, 1 means discharging.

The Gateway connects but no register values appear at all.

The most common cause is a mismatch between the configured slave unit ID and the address set on the inverter. Check the inverter display under the Communication or Modbus settings menu. Also confirm baud rate is 9600 bps, parity None, 8 data bits, 1 stop bit. The Solis COM port uses a proprietary connector; verify correct A/B polarity.

Writes to batterymode_a or batterymode_b appear to succeed but the inverter ignores them.

Register 43024 and 43110 use function code 16 (write multiple registers). Some firmware revisions require a specific storage mode to already be active before a setpoint write is accepted. Confirm the inverter is not in Off-Grid mode. After writing, poll the register back with a read to verify the value was stored.

Is it safe to write batterymode registers frequently from an automation script?

No. Solis write registers such as 43024 and 43110 are stored in onboard flash memory. Writing too frequently, for example every few seconds, can accelerate flash wear and may shorten hardware life. Limit writes to meaningful setpoint changes only, not continuous polling loops. Test changes manually before deploying automated logic.

Free Modbus template: Ginlong Solis Hybrid Inverter (S Series) (battery)

The Ginlong Solis Hybrid Inverter (S Series) is a residential and light-commercial hybrid PV inverter with integrated battery storage management. This ModbusCloud template connects via Modbus RTU over RS485 and reads battery power (registers 33149-33150 as a signed 32-bit pair), charge/discharge direction, state of charge, and cumulative discharge energy. Two writable registers allow remote control of the battery reserve SOC setpoint and the storage operating mode. The template gives installers a live view of battery behaviour and the ability to automate mode switching directly from the ModbusCloud portal.

Name	Address	Function	Type	Unit	Access
power_mul_a Instantaneous battery power, signed 32-bit value in watts.	33149	FC04	uint32	W	R
power_mul_b Battery charge/discharge direction flag: 0 = charging, 1 = discharging.	33135	FC04	uint16		R
energy Cumulative battery total discharge energy, in kilowatt-hours.	33165	FC04	uint32	kWh	R
soc Battery state of charge, 0 to 100 percent.	33139	FC04	uint16	%	R
batterymode_a Battery reserve mode SOC setpoint, written to control minimum reserve level.	43024	FC16	uint16		W
batterymode_b Battery storage control mode setpoint, written to select operating mode.	43110	FC16	uint16		W

Ginlong Solis Hybrid Inverter (S Series) (battery)

Overview

Use cases

Installation

Things to watch for

Registers (6)

Working with Modbus in your projects?

More Ginlong templates

Ginlong Solis Hybrid Inverter (S Series) (grid)

Ginlong Solis Storage Inverter (S Series) (pv)

Ginlong Solis Hybrid Inverter (RHI series) (grid)

Ginlong Solis Storage Inverter (S Series) (grid)

Ginlong Solis Hybrid Inverter (RHI series) (pv)

Ginlong Solis Hybrid Inverter (RHI series) (battery)

More RTU templates

Alnor HRU-P

Alnor HRU

Wattsonic - Schmachtl Sun Energy Box

Heidelberg Wallbox Energy Control

connecdoor.controller

Belimo Air-Water Actuator Modbus RTU