11 May 2009

Simrad/Lowrance NMEA2000 network power usage

Third in what is turning out to be a small series on power usage. This time I figured I'd benchmark the power usage of all the navigation equipment that I have collected so far for the new boat.

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.

DevicePowerCumulative
Lowrance HDS-8 (backlight @ 6)6.3W6.3W
Simrad IS20 Wind wand0.9W7.2W
Airmar DST800 depth/speed/temp sensor1.0W8.3W
Lowrance EP-65R fluid level sensor0.4W8.7W
Navico NAIS-300 AIS-B (receive mode)7.3W16.0W
Simrad RC42 compass0.9W16.9W
Simrad IS20 Graphic display0.8W17.7W
Simrad IS20 Multi display0.6W18.3W
Simrad IS20 Wind display1.0W19.3W
Simrad AC42 course computer2.5W21.8W
Simrad AP24 auto pilot controller0.8W22.6W
Airmar P319 sonar (depth) sensor1.4W24.0W

As always there are some small surprises here:
  1. The chartplotter only uses 25% of the power envelope
  2. NMEA2000 nodes seem to use at least 0.4W.
  3. 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

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