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PimDoos / ha-sessy

Home Assistant integration for Sessy (Smart Energy Storage SYstem)
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Sessy state of charge % value not correct displayed in home assistant #78

Closed robertjantak closed 11 months ago

robertjantak commented 11 months ago

Hello, it appears that the state of charge is not correctly displayed at home assistant.

this results is viseable in home assistant, the battery status is empty but still gives a state of charge of 4.0 %

here are some logs; this is the state of charge gathered directly from the api;

{ "status": "ok", "sessy": { "state_of_charge": 0.070000000298023224, "power": -2036, "power_setpoint": -2200, "system_state": "SYSTEM_STATE_RUNNING_SAFE", "system_state_details": "", "frequency": 50030 }, "renewable_energy_phase1": { "voltage_rms": 228020, "current_rms": 337, "power": 76

this is what is displayed at home assistant; Sessy-D9C9 State of Charge 1 minuut geleden 7,0%

PimDoos commented 11 months ago

The state of charge is provided by the api as a unit interval float. 1 == 100%, 0 == 0%. So the value you see in HA is correct and is the value provided by Sessy.

The discrepancy you're seeing is likely due to the BMS providing a skewed state of charge. This is a known issue at Sessy. To calibrate the state of charge, you can fully charge and then fully discharge the battery. After this, the state of charge will be much more accurate.