1. Introduction

In some high-latitude or high-altitude areas, the temperature (during winter) is quite low. The battery charging and discharging performance will be impacted significantly by the low temperature. SolaX developed a function of “Battery Heating” with 3 different levels to make your energy storage system able to work under extreme low temperature.

This function is disabled by default, so you need to enable this function if needed. After you enable this function, you also need to set heating periods and heating level.

2. Function logic

2.1 Low level

The cell temperature is below 0℃, it will be heated until 10℃. Once the cell temperature is below 0℃ again, the battery system will be heated.

2.2 Medium level

The cell temperature is below 10℃, it will be heated until 15℃. Once the cell temperature is below 10℃ again, the battery system will be heated.

2.3 High level

The cell temperature is below 20℃, it will be heated until 23℃ (T30) or 26℃ (HS25/36/50E/51). Once the cell temperature is below 20℃ again, the battery system will be heated.

Note:

a.Only if the cell temperature is higher than -10℃, the battery will be able to discharge, and only if cell temperature is higher than 0℃, the battery will be able to be charged.

b.The heating power per module is 180W for per T30 battery, 413W for per T58 V3.0 battery, 120W for per HS25/HS36 battery, 328W for per HS50E battery and 346W for per HS51 battery.

c.Please check the heating wires are correctly connected, or the heating function will not take effect.

d. The heating control is based on the cell temperature, which the internal temperature rather than the environment temperature. Normally the cell temperature is higher than the environment.

3. Heating during the heating periods

The heating system will take energy from PV in priority. If the PV power is not enough, it will take energy from battery or grid, which depends on the BAT actual SOC. 

l If BAT actual SOC＞35%, it takes from Battery. After using the Battery for heating, when the SOC is below 25%, the system will switch to take from Grid for heating.

l If BAT actual SOC＜35%, it takes from Grid.

4. Heating during the non-heating periods

The battery will be heated only if the PV has surplus energy.

5. Configuration

Setting path: 

Main → Settings → Advance Setting → Battery Heating

Step 1: Enable the ‘Battery Heating’ function.

This function is only valid when the battery has the heating function.

Step 2: Set the ‘Heating Period’ for the battery.

Two heating periods can be set. The setting range is 00:00 to 23:59.

Step 3: Set different Heating Level.

There are 3 levels of temperature: Low, Medium and High. Once a battery is heated to the target temperature, heating will stop.

l Low: Target temperature: 10℃. Battery charge/discharge current: 10A.

l Medium: Target temperature: 15℃. Battery charge/discharge current: 15A.

l High: Target temperature: 23℃(T30) and 26℃(HS25/36/50E/51). Battery charge/discharge current: 30A.

Note:

If the ambient temperature is extremely low, turning on battery heating will consume a significant amount of electrical energy.

Compatibility

Compatible Model List:

Note:

a.Before using this function, ensure that the firmware of the battery and inverter has been upgraded to the latest version.