BMU801 LED modes - AWS310 - AWS310-SITE - AWS810 - AWS810-SOLAR

BMU801 LED modes during normal operation
LED color/Behavior	State	Actions
Battery status green, all 3 LEDs steady Device status green, steady	Battery is fully charged (SoC, state of charge = 100 %) DC power is available. Charging is stopped or in float mode.	–
Battery status green, blinking SoC = 70–100 % SoC = 40–70 % SoC < 40 % Device status green, steady	Battery is charging. DC power is available either from DC or solar input.	–
Battery status green, steady, 0 to 2 LEDs blank SoC = 100 % SoC = 70–100 % SoC = 40–70 % Battery status yellow, steady or blinking, 2 LEDs blank SoC = 10–40 % SoC < 10 % Device status green, steady	Battery is not charging. DC power is available but the voltage level is insufficient for charging. The voltage must be at least 15 V.	–
Battery status blank Device status green, blinking	Battery is functional but discharging. There is no DC power and the system is running on batteries. Battery LEDs are powered off to save power.	If you want to check the battery SoC, short press the Power/Test button. The SoC is displayed in the battery LEDs.
The last known battery status Device status yellow, steady	BMU801 is overheated. Internal temperature sensor has detected an excessive operating temperature. Battery charging is temporarily paused until the device temperature is within the operational limits again.	–
Battery status red, steady Device status yellow, blinking	Battery is overheated. Battery temperature sensing resistor (NTC) has detected an excessive operating temperature. Battery charging is temporarily paused until the battery temperature is within the operational limits again.	–
Battery status red, blinking Device status yellow, blinking	Battery is faulty or disconnected, DC power is available. The system has detected a serious battery failure.	Check that the battery is connected and reconnect the battery if needed. The battery status LEDs display the last known battery status. The device status LED turns green. If the battery is faulty, disconnect the battery from BMU801. The device status LED turns steady green. The battery status LEDs of the disconnected battery display blank. Replace the faulty battery.
Battery status blank Device status yellow, blinking	Battery is faulty, DC power is unavailable. The system has detected a serious battery failure in one of the batteries (the other battery is still functioning).	To see which one of the batteries has failed, short press the Power/Test button. The battery status LEDs of the faulty battery start blinking red. Disconnect the faulty battery from BMU801. The device status LED starts blinking green. The battery status LEDs of the disconnected battery display blank. Replace the faulty battery.
The last known battery status Device status red, steady	Safe input current limit (10.0 A) is exceeded. If the input current exceeds 10.5 A for 30 seconds, the DC output power is temporarily disabled for 2 minutes.	If the error situation continues and BMU801 cannot enable DC output power, detach the DC out connector from BMU801. If the device status LED turns into something else than steady red, it indicates that BMU801 functions correctly and there is a problem somewhere else in the system.
The last known battery status Device status red, steady	DC output short circuit protection has been triggered. BMU801 tries to enable DC output periodically until the short circuit condition has been resolved. DC output is re-enabled 5 times with a 1‑second interval, after which BMU801 waits for 10 seconds and tries again (this is repeated indefinitely).
Battery status blank Device status red, steady	BMU801 malfunction. This state may appear during boot or operation.	Try pressing the Power/Test and Reset buttons. If the device status LED turns blinking red, BMU801 has malfunctioned. Replace BMU801.
Battery status green, steady, 0 to 2 LEDs blank SoC = 100 % SoC = 70–100 % SoC = 40–70 % Battery status yellow, steady or blinking, 2 LEDs blank SoC = 10–40 % SoC < 10 % Device status red, blinking	Rotary switch does not match the originally selected position during normal operation. Charging is disabled.	Correct the rotary switch position to match the battery capacity. BMU801 returns to normal operation.
Battery status blank Device status red, blinking	Rotary switch is in unsupported position at startup. DC output and charging are disabled.	Correct the rotary switch position to match the battery capacity. To confirm the switch position, reboot BMU801 or reset the battery.
Battery status blank Device status blank	BMU801 does not power up from DC input power or BMU801 does not power up from battery power.	Check that the DC input power is connected (DC in, Solar 1, or Solar 2). Check the polarity of the input power connection and correct if needed. ¹ If you have only one battery in your system: Check that it is connected to the Batt 1 connector. Long press the Power/Test button.

BMU801 LED modes during user actions
Action	LED	Color/Behavior	Description
To switch on BMU801, long press the Power/Test button.	Device status LED	Green steady, and then blank after a short timeout. When the Power/Test button is released, the LED switches to blinking green after a short timeout.	–
To switch on BMU801, long press the Power/Test button.	Battery status LED	Current SoC. Blank, all 3 LED indicators.	First the LEDs display the current SoC. If there is no DC power available, the LEDs go into power saving mode (all 3 LED indicators blank).
To check the battery status, short press the Power/Test button. If no DC power is available, the battery status LEDs are powered off to save power. The LEDs display the battery status indication for 5 seconds and return to previous state after that.	Battery status LED	Green, steady, all 3 LED indicators.	Battery is full. SoC = 100 %
		Green, steady, 2/3 of the LED indicators.	SoC = 70–100 %
		Green, steady, 1/3 of the LED indicators.	SoC = 40–70 %
		Yellow, steady, 1/3 of the LED indicators.	SoC = 10–40 %
		Yellow, blinking, 1/3 of the LED indicators.	SoC = 0–10 %. System shutdown soon.
		Red, steady, 1/3 of the LED indicators.	SoC = 0 %. Battery is disconnected. ²
		Red, blinking, all 3 LED indicators.	Battery fault. Battery is disconnected. ²
To switch off the unit, long press the Power/Test button.	Device status LEDs	Green blinking, and then blank. >	When you long press the Power/Test button, you are first warned of a shutdown with a blinking green LED. After a short timeout, the LED turns blank. ³
To switch off the unit, long press the Power/Test button.	Battery status LED	Blank, all 3 LED indicators.	Power is off.
To reset the battery SoC counter, press the Reset button.	Device status LED	Yellow, steady, until the battery probing has completed.	After the probing has completed, the device status LED displays the current device status.
	Battery status LED	Yellow, blinking one by one. Current SoC. Blank, all 3 LED indicators.	First the battery LED displays an animation for approximately 1 minute, where the 3 LED indicators are blinking yellow one at a time. Then the LED displays the current SoC. If there is no DC power available, the LED goes into power saving mode (all 3 LED indicators blank). ⁴

¹ All input power connectors have reverse polarity protection, which means that no damage has been done to the system if the connector has been accidentally wired the wrong way or polarity is incorrect at the source.

² If there are 2 batteries, the system can operate with one battery even if the other one is disconnected.

³ If you release the button before the long press time (4 seconds), BMU801 will continue operation.

⁴ The animation is displayed in both battery LEDs.

BMU801 LED modes - AWS310 - AWS310-SITE - AWS810 - AWS810-SOLAR - BMU801

BMU801 User Guide