[Feature Request] Separate self-consumption from `gridOffPower`

[fellek]

Device

SolarFlow 2400 AC + AB3000X

Description

Hi! While comparing the reported gridOffPower value with actual power measurements at the off-grid socket, I noticed that gridOffPower includes the device’s own system losses (inverter, DC/AC converter, BMS, controller) — not just the power delivered to the off-grid consumer.

The difference between reported and measured power varies significantly depending on the device state:

Device state	Reported gridOffPower	Measured at socket	Difference
Discharging (smartMode=1)	~145W	~90W	~50-60W
Charging (smartMode=1)	~120W	~90W	~20-30W
Bypass / SOCEMPTY (smartMode=0)	~95W	~90W	~5W

The attached graph shows this clearly — the gap between reported (blue) and measured (yellow) power shrinks significantly once the device enters bypass mode around 22:20 (SoC reaches minimum).

This makes it difficult for users and integrations to accurately track:

• How much energy the off-grid consumer actually uses
• How much energy the device consumes internally
• The true system efficiency

Request

Would it be possible to expose the device’s internal self-consumption as a separate MQTT property (e.g. selfConsumption in watts)? Since the firmware already seems to know this value — it adds it to gridOffPower — it might be straightforward to report it separately.

Alternatively, reporting the actual power delivered at the off-grid socket (excluding system losses) would also solve the issue. As users could compare battery output with Offgrid-Output.

This would be very helpful for energy monitoring and home automation use cases. Thank you for considering this!