The Hawk is fitted with a 3500mAh LiPo rechargeable battery. This is designed to allow for a 'full season' deployment, to be later recharged and then redeployed for the next season.
For permanent installations, aggressive sampling/upload rates, or when using power-hungry sensors - a solar panel can be connected to the Hawk.
- 6V+ (Hawk min operating voltage)
- For continuous operation at high temperatures and high output load currents we recommend an input voltage of 12V or higher.
Connect the panel to the external power terminals on the Hawk base-board (Vin + GND)
Charging Internal Battery
The internal battery is charged at a maximum current of 400mA. This means it will take 8hrs 45 min to fully charge the battery from empty.
Charging in Extreme Temperatures
It is important to note that the back up battery will not be charged if the temperature is <-10°C, or >45°C. This means that if the device is left exposed in the sun on a hot day, a solar panel will not charge the battery.
Ensure you take measures to reduce the internal temperature of the unit as much as possible (i.e. mount device under the panel in the shade).
Monitoring Panel Output/Hawk Charging
- The Voltage output by the panel will simply be the input to the Hawk, which is reported in Analogue 2
- The battery is fully charged at ~4.1V
- The battery is empty at approximately 3.6-3.7V
Vext Digital Input
The Vext Parameter tab can be configured to map the external power status (Good/Not Good) to Digital Input 3
In general, it is best to leave this on defaults (no active or inactive action) - since a solar panel voltage may fluctuate during the day leading to a large number of unnecessary logs.
This is more typically used when connected to mains power and we desire an instant alert on the server when this is disconnected.