|Relay current: 24.3 mA |
System power: 408.3 mW
|Relay current: 8.14 mA |
System power: 295.1 mW
With the new relay, the power consumption of the system on battery power is under 300mW. The purpose of the relay is to make sure that when the system has turned itself off, no leakage current discharges the battery over long periods of storage. So it only uses power when enough solar power or battery charge are available.
Since the new relay pulls so few mA, I tried to run it directly from the Arduino port, but strangely, the system uses less power with the transistor than without! So the transistor stays.