Again measured using a Voltcraft 3000 at the 230V AC, so the actual figures are too high by 10-20% when using a direct 12V DC source. Since I am going to use a 24 V to 12 V DC/DC converter that will probably have the same sort of efficiency as the AC/DC converter that I am using now, I figure these measurements are good enough for me personally.
| Device | Power | Cumulative |
| Lowrance HDS-8 (backlight @ 6) | 6.3W | 6.3W |
| Simrad IS20 Wind wand | 0.9W | 7.2W |
| Airmar DST800 depth/speed/temp sensor | 1.0W | 8.3W |
| Lowrance EP-65R fluid level sensor | 0.4W | 8.7W |
| Navico NAIS-300 AIS-B (receive mode) | 7.3W | 16.0W |
| Simrad RC42 compass | 0.9W | 16.9W |
| Simrad IS20 Graphic display | 0.8W | 17.7W |
| Simrad IS20 Multi display | 0.6W | 18.3W |
| Simrad IS20 Wind display | 1.0W | 19.3W |
| Simrad AC42 course computer | 2.5W | 21.8W |
| Simrad AP24 auto pilot controller | 0.8W | 22.6W |
| Airmar P319 sonar (depth) sensor | 1.4W | 24.0W |
As always there are some small surprises here:
- The chartplotter only uses 25% of the power envelope
- NMEA2000 nodes seem to use at least 0.4W.
- The NAIS-300 uses more power than I'd thought it would. Being able to shut it down completely is something to be considered.
Note to self (and reader): this is on the benchtop, the following is still missing:
- RF300 rudder feedback (should be neglible)
- Hydraulic pump (e.g. using the autopilot as opposed to just having it in standby)
- VHF #1
- Simrad WR20 remote
- Broadband RADAR sensor
- Ethernet switch
