# Dynamic ESS not discharging battery – prioritizes grid even with high fixed buy price

**URL:** <https://community.victronenergy.com/t/dynamic-ess-not-discharging-battery-prioritizes-grid-even-with-high-fixed-buy-price/41097>\
**Category:** DESS\
**Tags:** expert, dess, cerbo\_gx, vrm\
**Created:** [28 July 2025 15:03 UTC](https://community.victronenergy.com/t/dynamic-ess-not-discharging-battery-prioritizes-grid-even-with-high-fixed-buy-price/41097 "2025-07-28T15:03:21Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![kyros32](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/kyros32/32/31963_2.png) [@kyros32](https://community.victronenergy.com/u/kyros32)\
**Post date:** [28 July 2025 15:03 UTC](https://community.victronenergy.com/t/dynamic-ess-not-discharging-battery-prioritizes-grid-even-with-high-fixed-buy-price/41097/1 "2025-07-28T15:03:21Z")

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Hello,

we are experiencing an issue with the **Dynamic ESS** feature in Victron. When DESS is enabled, the system **does not discharge the battery into the local loads** , even when the **buy price is fixed and set high**.

Instead, it continues to **draw power from the grid** , even though the battery is full and the load is significant. When **Dynamic ESS is turned off** , everything behaves as expected – the battery discharges normally into the local loads.

We also noticed that DESS sets a strange **SoC target of 86%** , without clear explanation or economic reason. There are **no SoC limits or other constraints** configured in ESS settings that would justify this behavior.

### **System Details:**

- **ESS Mode** : Dynamic ESS enabled

- **Battery** : Pylontech, capable of full discharge

- **Grid Meter** : Installed and working, ET340

- **Buy Price** : Fixed (e.g. 7 CZK/kWh for testing)

- **Sell Price** : dynamic

- **Firmware** : 3.63 Cerbo, 556 Multi

### **Expected Behavior:**

When buy price is **high** then regardless of sell price, the system should **discharge battery into consumption** to reduce grid purchase. Please see attached.  
@mpvader @Lpopescu

 ![thread-viewer](https://europe1.discourse-cdn.com/victron/original/3X/5/4/54862f0c9f1e8d966c3999301af86d091b3b91a3.png)  
 ![3B1FBC0C-D29B-4773-915A-7B2065F74733](https://europe1.discourse-cdn.com/victron/original/3X/8/3/8366ea26d72e426621322b35b3639a865242395a.jpeg)  
 ![Snímek obrazovky 2025-07-28 v 17.02.45](https://europe1.discourse-cdn.com/victron/original/3X/e/8/e8889f3e69e36e88011e4265aa32675a15076355.png)