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Force time of use Solax SX4 charge state to match total solar excess capacity #4044

@p71214

Description

@p71214

Background
I have a hybrid SX4 hybrid Solax Gen2 SL5000 inverter, with a Pylontec 19,600Wh battery, and two other Solax Gen 1 (5000, 2200W) grid connected inverters.
Predbat is configured and correctly recognizes the total solar generation from all 3 inverters. The default charge mode is for predbat to leave the hybrid inverter in Self Use Mode, this only then sees its directly connected solar array and as such limits the battery charge to the internal limits of the inverter and BMS.
This is typically ~~ 50% of the 5000W possible as this inverter red phase also supplies most of the house load. It does on occasion reach 100A but this is for a limited period in the day.
The other two inverters (5000W, 2200W) are on blue and white phases.

Home assistant is installed on a bare metal intel micro PC (IBM), with predbat installed from HACS on this HA server.

The request:
I would like predbat to have a function to automatically switch to FTU and manage the charge current to match the excess total solar from all 3 inverters as read from the entity in Predbat, maximum total solar generation of 12200W, real in summer 11,500W and around 45 to 80kWh a day. Then switch back to Self Use Mode or Backup Mode if exporting.

The result would be the battery achieves max soc, first, then export or push excess total solar iboost to heat my SPA.

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