SunSpec Modbus: one register map for many inverters
SunSpec Modbus is the open register map SMA, Fronius, SolarEdge and Kostal share. Learn the layout, int+SF vs float, ports, and reading a mixed fleet.
12 min27 August 2026
Read out Modbus devices without programming. Plug in the gateway, pick a ready-made template, done.
Browse 900+ templatesPractical guides for connecting, configuring and monitoring Modbus devices.
SunSpec Modbus is the open register map SMA, Fronius, SolarEdge and Kostal share. Learn the layout, int+SF vs float, ports, and reading a mixed fleet.
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SolarEdge Modbus for installers: enable Modbus TCP in SetApp on port 1502, the verified SunSpec register map with scale factors, the 502 trap, and how a gateway polls the inverter alongside the SolarEdge portal.
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Solar inverter monitoring with Modbus: read SMA, Fronius, KOSTAL, Huawei and SolarEdge via SunSpec, which registers matter and how a vendor neutral fleet view works.
Modbus function codes explained for installers. Read holding registers (0x03), write multiple (0x10), exception codes, and the 40001 vs 0x0000 trap.
F-gas digital logbook obligations under EU 2024/573 explained for refrigeration contractors. From the 5 t CO2-eq threshold to Modbus telemetry that feeds the logbook automatically.
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RS485 wiring for Modbus explained: cable choice, length vs baud rate, A/B polarity, termination, shielding, and the field mistakes that break a bus.
Home Assistant Modbus integration for installers. Three connection types compared, YAML examples for SolarEdge and Eastron, scan_interval guidance per device class, and when to step up to professional monitoring.
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