Why am I not getting any response from the SAJ R5 inverter?

Check that the baud rate on the gateway is set to 2400. The SAJ R5 uses a lower baud rate than most inverters. Also verify RS-485 A/B wiring polarity and confirm the correct slave address.

Why do energy registers show incorrect or very large values?

Monthly, yearly and total energy values are stored as uint32 across two consecutive Modbus registers. Make sure the gateway is reading both registers and combining them in the correct byte order.

The inverter is single-phase, so why does the template include L1, L2 and L3 registers?

The SAJ R5 register map defines AC output registers for L1 through L3 even though the inverter is single-phase. L2 and L3 will typically read zero. The template maps all three for completeness.

Can I control or configure the inverter through this template?

No. This template is read-only. It monitors PV input, AC output, energy totals and diagnostics but does not include any writable registers.

Free Modbus template: SAJ Inverter R5_V1

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Free Modbus template: SAJ Inverter R5_V1 | ModbusCloud

Registers (47)

47 read / 0 write

Name	Address	Function	Type	Unit	Access
03-256-MPVMode	256	FC03	uint16		R
03-257-FaultMSG	257	FC03	uint16		R
03-263-PV1Volt	263	FC03	uint16	V	R
03-264-PV1Curr	264	FC03	uint16	A	R
03-266-PV2Volt	266	FC03	uint16	V	R
03-265-PV1Power	265	FC03	uint16	W	R
03-267-PV2Curr	267	FC03	uint16	A	R
03-270-PV3Curr	270	FC03	uint16	A	R
03-268-PV2Power	268	FC03	uint16	W	R
03-269-PV3Volt	269	FC03	uint16	V	R
03-271-PV3Power	271	FC03	uint16	W	R
03-272-BusVolt	272	FC03	uint16	V	R
03-273-InvTempC	273	FC03	int16	°C	R
03-274-GFCI	274	FC03	int16	mA	R
03-275-Power	275	FC03	uint16	W	R
03-276-QPower	276	FC03	int16	Var	R
03-277-PF	277	FC03	int16		R
03-278-L1Volt	278	FC03	uint16	V	R
03-279-L1Curr	279	FC03	uint16	A	R
03-282-L1Power	282	FC03	int16	W	R
03-283-L1PF	283	FC03	uint16		R
03-280-L1Freq	280	FC03	uint16	Hz	R
03-281-L1DCI	281	FC03	int16	mA	R
03-284-L2Volt	284	FC03	uint16	V	R
03-285-L2Curr	285	FC03	uint16	A	R
03-286-L2Freq	286	FC03	uint16	Hz	R
03-287-L2DCI	287	FC03	int16	mA	R
03-288-L2Power	288	FC03	uint16	W	R
03-289-L2PF	289	FC03	int16		R
03-296-ISO1	296	FC03	uint16	kΩ	R
03-290-L3Volt	290	FC03	uint16	V	R
03-291-L3Curr	291	FC03	uint16	A	R
03-292-L3Freq	292	FC03	uint16	Hz	R
03-293-L3DCI	293	FC03	int16	mA	R
03-294-L3Power	294	FC03	uint16	W	R
03-295-L3PF	295	FC03	int16		R
03-297-ISO2	297	FC03	uint16	kΩ	R
03-298-ISO3	298	FC03	uint16	kΩ	R
03-299-ISO4	299	FC03	uint16	kΩ	R
03-300-Today Energy	300	FC03	uint16	kWh	R
03-301-Month Energy	301	FC03	uint32	kWh	R
03-303-Year Energy	303	FC03	uint32	kWh	R
03-305-Total Energy	305	FC03	uint32	kWh	R
03-307-Today Hour	307	FC03	uint16	H	R
03-308-Total Hour	308	FC03	uint32	H	R
03-310-Error Count	310	FC03	uint16		R
03-311-TIME	311	FC03	int32	<v.u>	R

SAJ Inverter R5_V1

Overview

Key readings

Use cases

Installation

Things to watch for

Registers (47)

Working with Modbus in your projects?

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