Anyone any suggestion

[deveylder]

I’d like to suggest a concept based on a scenario we encounter regularly in the European energy market, which I believe could be useful for many users.

Scenario:

In Europe, electricity prices can occasionally go negative, meaning consumers are paid to use electricity, while exporting energy to the grid incurs a cost.

In these events, I want to optimize my system operation based on three core goals:

Objectives:

1. Stop discharging the battery

• During negative pricing periods, discharging the battery leads to financial loss.
• Battery output must be zero.

2. Charge the battery from the grid (only)

• Take advantage of negative pricing to charge the battery.
• Prevent any simultaneous discharging.

3. Cap total grid import at a specified limit (e.g., 4000 kW)

• Our grid contract allows up to 4000 kW of import.
• Any demand above 4000 kW must be covered by the battery.
• Grid import must be capped at the contractual limit.

Desired Control Logic:

• If electricity price < 0 €/MWh:
  • Set battery discharge power = 0
  • Enable battery charging from grid (subject to SOC and limits)
  • Set maximum allowed grid import = 4000 kW
  • If total site demand > 4000 kW, use battery to cover the excess
• If electricity price ≥ 0 €/MWh:
  • Return to standard operation or existing automation rules

Key Constraints:

• No energy should be exported to the grid
• Battery should not discharge unless grid import hits the 4000 kW cap
• System should dynamically switch modes based on real-time pricing
• Must respect the contractual import limit strictly to avoid surcharges

[nzkiwi68]

Everything you have asked for is possible today using this amazing integration and HA.

1. Stop discharging the battery
Set your inverter export limit to 0 to disallow any export at all.
Set your inverter to "General" or "Backup" mode where general mode will still use battery to support the house but not export (except for tiny amounts briefly as the house load fluctuates), backup mode whereby the inverter doesn't support the house using battery at all, just keeps the battery for a power cut of if you change modes and decide to export.

2. Charge the battery from the grid (only)
Switch the inverter to "Eco Charge" mode to charge from grid and no longer support the house. Battery will not discharged. Inverter will not export to Grid.

3. Cap total grid import at a specified limit (e.g., 4000 kW)
Quite a fun project!
You will need to track all imported power and store that into HA using an energy meter to track it and reset in line with your bill (calendar monthly or whatever). Then use automation's and/or NodeRED to disallow further grid import.
Don't ask exactly how to do this, I have not needed to do this, so I have not built this for me, but these pointers should show you the way.

Lastly
I personally am using a GoodWe GW5048D-ES and I use a combination of NodeRED for flow logic and some HA standard automation's. I also get NodeRED to fire some HA standard GUI automation's to set things I found difficult to easily set using NodeRED and that works great!