[Custom Component] SAJ H2 Inverter

stanus74 · March 2, 2025, 10:33am

Hi everyone,

I’d like to introduce the SAJ H2 Inverter Modbus integration for Home Assistant – designed for SAJ H2/HS2 inverters and likely compatible with Ampere Solar (EKD-Solar) inverters too! It reads data via Modbus TCP and brings powerful control to your setup.

Features

Over 190 Registers: Monitor power, energy, temperature, battery stats, and more.
Charge Battery with Grid Power: New! Set charging times and power levels, plus switch between Self-Consumption and Time-of-Use modes.
Configurable Polling: Adjust the update interval anytime via the UI.
Smart Connection Management: Optimized Modbus TCP handling, especially for AIO3 models.

Compatibility

Built for SAJ H2/HS2 Inverters using the SAJ H2 Protocol. Should also work with Ampere Solar Inverters (based on SAJ HS2).

Get Started

Find it on GitHub.

I’d love to hear your feedback or contributions!

mike_home_84 · March 2, 2025, 11:49pm

@stanus74 thanks for yet another update! I am trying it out now. One question, it seems to have permanently set my charging power to 25%. Is there a reason the integration only goes to 25%?

stanus74 · March 9, 2025, 8:44am

Version 1.8.1 is avaiable

stanus74 · March 15, 2025, 5:25pm

For users of my integration, I highly recommend the Sunsynk Power Flow Card (available via HACS) to beautifully visualize your energy production, consumption, battery status, and individual load details. This intuitive Lovelace card provides a clear and attractive overview of your entire energy system, allowing you to monitor and optimize your power usage at a glance.

Check it out here:

Yaml code which I currently use



type: custom:sunsynk-power-flow-card
cardstyle: full
show_solar: true
battery:
  energy: 10000
  shutdown_soc: 20
  show_daily: true
  max_power: 9000
  soc_end_of_charge: 90
  shutdown_soc_offgrid: 20
solar:
  show_daily: true
  mppts: 1
load:
  colour: "#5fb6ad"
  show_daily: true
  show_daily_aux: true
  show_aux: true
  invert_aux: false
  show_absolute_aux: false
  aux_loads: 2
  aux_load1_name: Boiler
  aux_load2_name: HK IR
  aux_load1_icon: mdi:water-boiler
  aux_load2_icon: mdi:heat-wave
  animation_speed: 8
  max_power: 8000
  auto_scale: true
  dynamic_colour: true
  path_theshold: 100
  off_threshold: 0
grid:
  show_daily_buy: true
  show_daily_sell: true
  show_nonessential: false
entities:
  use_timer_248: switch.sunsynk_toggle_system_timer
  priority_load_243: switch.sunsynk_toggle_priority_load
  inverter_voltage_154: sensor.sunsynk_inverter_voltage
  load_frequency_192: sensor.saj_r_phase_grid_frequency
  inverter_current_164: sensor.
  inverter_power_175: sensor.saj_inverter_power
  grid_connected_status_194: null
  inverter_status_59: sensor.saj_inverter_status
  day_battery_charge_70: sensor.saj_battery_today_charge
  day_battery_discharge_71: sensor.saj_battery_today_discharge
  battery_voltage_183: sensor.saj_battery_1_voltage
  battery_soc_184: sensor.saj_battery_1_soc
  battery_power_190: sensor.saj_battery_power
  battery_current_191: sensor.saj_battery_1_current
  battery_temp_182: sensor.saj_battery_temperature
  grid_power_169: sensor.saj_grid_load_power
  day_grid_import_76: sensor.saj_sum_all_phases_feed_in_today
  day_grid_export_77: sensor.saj_sum_all_phases_sell_today
  grid_ct_power_172: sensor.saj_ct_grid_power_watt
  day_load_energy_84: sensor.saj_total_today_load
  essential_power: none
  nonessential_power: none
  aux_power_166: none
  day_pv_energy_108: sensor.saj_power_current_day
  pv1_power_186: sensor.saj_pv1_power
  pv2_power_187: null
  pv1_voltage_109: sensor.saj_pv1_voltage
  pv1_current_110: sensor.saj_pv1_total_current
  radiator_temp_91: sensor.saj_inverter_temperature
  environment_temp: sensor.gw1100a_outdoor_temperature
  aux_load1: sensor.sd_1_power
  aux_load2: sensor.sd_hk_3_power
  
inverter:
  three_phase: true
  modern: true
  autarky: power

stanus74 · March 15, 2025, 6:26pm

Must Read! eBooks on Intelligent Battery Management for PV Systems

I would like to recommend 2 PDFs to you. They contain a very professional information & tipps of intelligent management of a PV system with battery storage.

Fronius Battery Charging with Time-of-use Tarifs: Technical information explaining how intelligent battery charging can be used to exploit lower electricity tariffs, optimize battery use, and reduce costs. https://www.fronius.com/~/downloads/Solar%20Energy/Whitepaper/SE_WP_Time_Of_Use_Hybrid_Inverters_EN.pdf
SMA SMART HOME Planning Guide: A detailed guide to planning and implementing SMA Smart Home systems, covering energy management, PV energy self-consumption, battery storage solutions, and intelligent load management to achieve higher energy independence.
https://files.sma.de/assets/259463.pdf

(Note: The PDFs are also available in German.)