DESS issue prevention

💡 Flow Purpose: Battery Protection and DESS Bug Fix

This flow (named "Force Batt charge after grid off") acts as an automatic safeguard for your Victron energy system.

Its primary goal is to solve a potential issue (labeled as "DESS bug fix") where Dynamic ESS (DESS) might prevent the battery from charging if its State of Charge (SoC) has dropped below the configured minimum threshold (e.g., after a grid failure).

The flow constantly monitors the battery's charge level.

• If the charge drops below the minimum, it forcibly disables DESS and switches the ESS mode to "Keep batteries charged".
• As soon as the charge rises above the minimum, it re-enables DESS ("Auto" mode) and sets the ESS mode back to "Optimized".

⚙️ How it Works: Step-by-Step Logic

The entire process runs automatically every minute.

1. Trigger (Every 60 seconds):

   • An inject node (ee53d79e0c881a0b) automatically starts the flow every 60 seconds to check the system's status.

2. Data Collection:

   • Two victron-input nodes read the current system settings:
     • victron-input-battery (b57899fa2275874e): Gets the current Battery State of Charge (SoC) (e.g., 80%).
     • victron-input-ess (2288bbeffd17b4e1): Gets your configured Minimum Discharge SoC (e.g., 85%).
   • These two values are stored in flow-level variables (flow.batt_soc and flow.ess_min_soc) for the main logic to use.

3. Main Logic (Node "DESS bug fix"):

   • The core function node (bbd2556b12dc9218) receives the trigger from the timer.
   • It reads the stored current SoC and minimum SoC values.
   • It compares them and makes a decision:

   ---

   ➡️ Scenario A: Battery is Low (Current SoC < Minimum SoC)

   • Example: Current = 80%, Minimum = 85%
   • Action: The flow generates a message to force the battery to charge.
   • It sets:
     • ess_state: 9 (Mode "Keep batteries charged")
     • dess_mode: 0 (Mode "Off" for Dynamic ESS)

   ---

   ➡️ Scenario B: Battery is OK (Current SoC > Minimum SoC)

   • Example: Current = 86%, Minimum = 85%
   • Action: The flow generates a message to return to normal operation.
   • It sets:
     • ess_state: 10 (Mode "Optimized mode w/o BatteryLife")
     • dess_mode: 1 (Mode "Auto" for Dynamic ESS)

4. Execute Commands:

   • The message from the logic node is sent to two victron-output nodes:
     • victron-output-dess (a7cebd46357993ab): Receives the dess_mode (0 or 1) and turns Dynamic ESS "Off" or "Auto".
     • victron-output-ess (f415d212bbd74d18): Receives the ess_state (9 or 10) and changes the main ESS mode (to "Keep charged" or "Optimized").

📋 Key Node Overview

• Inject (Timer): Triggers the check every 60 seconds.
• Victron Input (Battery SoC): Reads the current charge percentage.
• Victron Input (ESS Min SoC): Reads the configured minimum percentage.
• Function "DESS bug fix": The brains of the operation. Compares current vs. minimum SoC.
• Victron Output (DESS Mode): Sets DESS to "Auto" (1) or "Off" (0).
• Victron Output (ESS State): Sets ESS to "Optimized" (10) or "Keep batteries charged" (9).
• Debug: Helps you see what decisions the flow is making.

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