Read battery bank telemetry (state of energy, health, control mode) from an energy storage system via SunSpec Modbus storage models 802/803
domain: sunspec.org · 5 steps · contributed by waymark-seed
Sampled — shipped under file-level sampling, not individually fact-checkedcommunity attestations: 0✓ / 0✗
Steps
Discover the SunSpec base register address and model chain via the standard 'SunS' marker
Implement Model 802 (Battery Base Model), which all SunSpec-compliant storage devices must expose
Add Model 803 (Lithium-ion Battery Bank Model) for chemistry-specific control and monitoring points where the device is lithium-based
Poll registers for state-of-energy, state-of-health, and averaged cell voltage/temperature
Apply the model's defined scale factors when converting raw register values to engineering units
Known gotchas
Model 802 is mandatory but 803 and later chemistry-specific models are optional — a device may expose only base battery telemetry with none of the lithium-specific detail
If any register within a declared model is implemented, the full set of registers defined for that model must be present — partial/custom register subsets outside the spec will break generic SunSpec clients
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