SunSpec starter library

A starter SunSpec mapping (spec §20.3) demonstrating the v0.4 constructs the SunSpec ecosystem needs: model-chain discovery with model-relative offsets, and register-referenced scale factors. Import as moddef:stdlib:sunspec:1.0.0. Covers the Common model (1) and the single-phase inverter model (103); more models are future work.

Synced from moddef/stdlib.

SunSpec Common Model (model 1)

Point	Name	Storage	Unit	Offset*
manufacturer	Manufacturer	STRING_ASCII	none	2
model	Model	STRING_ASCII	none	18
serial_number	Serial Number	STRING_ASCII	none	50

SunSpec Inverter Model 103 (model 103)

Point	Name	Storage	Unit	Offset*
ac_current_sf	AC Current Scale Factor	S16	none	6
ac_current	AC Current	U16	A	2
ac_voltage_sf	AC Voltage Scale Factor	S16	none	13
ac_voltage_ln	AC Voltage L-N	U16	V	10
ac_power_sf	AC Power Scale Factor	S16	none	15
ac_power	AC Power	S16	W	14
frequency_sf	Frequency Scale Factor	S16	none	17
frequency	AC Frequency	U16	Hz	16

* Offset is relative to the model's ID register (spec §7.3).