Energy Storage

In Port 1 Uplinks, the actuator uses its "Energy Storage" status bit to indicate that its long-term operation has consumed more energy than it generated. The remaining charge level at this point is approximately 25%, which is why the device continues with full functionality while signaling a negative energy balance to the user. It is strongly recommended to regularly check the ES bit in order to recognize a discharge of the storage and to prevent its progression by suitable measures (e.g. Slow Harvesting outside of operating times). If the energy storage continues to discharge and its voltage falls below a certain limit, then the device automatically goes into the state of Forced Heating.

In Port 1 Uplinks, the actuator uses its “Storage Voltage” byte to report the device storage voltage.

Energy storage typical voltage values	Voltage [V] LTO
Fully charged – for charge stop (bq25505 and USB)	2.8
Fully charged – for indicator bit	2.7
Normal operation	2.4 typical (2.0 … 2.8)
Energy storage bit set when below	2.3
Forced Heating starts when below	2.2
Forced Heating stops when above	2.4
Microcontroller turning off all loads and its own power when below	1.8
Microcontroller power-up (under hardware-control) when above	2.37
Battery spec HTC1450 (capacity / charge stop / discharge stop)	>500mAh / 2.8V / 1.5V

If, on Port 0, a MAC command 0x06 is sent to the device, the device returns battery level information.

Device Response	Battery Level
0	The device is connected to an external power source
1	2.20 V
1 <= d <= 254	V
254	2.64 V
255	The device was not able to measure the battery level