# Reserve Charge

If power outages are frequent or prolonged in your area, it is recommended to set a higher reserve power percentage to obtain more reliable backup capability.

If you are more concerned with improving the overall utilization efficiency of the energy storage system, you can choose a lower reserve power percentage.

**How to use:**

Drag the slider to set the minimum charge level you want to retain; this setting will always take effect,<mark style="color:orange;">applies to all operating modes</mark>.

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{% hint style="info" %}
When the reserve power is set below 20%, the system will display a “Low reserve power” warning. In this case, the battery may not be able to provide sufficient backup power for the home during prolonged outages.
{% endhint %}
