Stray electrons

[Moosewood]

Hi Tugnuts.
New to ownership and have a 2020 R-23OB.
Installed a Victron SmartShunt and noticing a draw of about .4 amp with everything off. (Batteries all off)
I imagine the SmartShunt draws a little bit are there other items on the hot battery bus that is constantly monitoring things like bilge levels that used some energy? Is this amount of current normal?

 

[Maggie Anne]

Bilge pumps are direct wired. Safety devices (CO2 monitor, Propane detector). Possibly some items that need power for memory

 

[venajeff]

Welcome to the parasitic loads rabbit hole.

 

[Maggie Anne]

Also, all of these items will have fuses so you can start by pulling them to verify which ones are creating the loads. Of course, don't forget to put the fuses back when done.

 

[Submariner]

Hi Tugnuts.
New to ownership and have a 2020 R-23OB.
Installed a Victron SmartShunt and noticing a draw of about .4 amp with everything off. (Batteries all off)
I imagine the SmartShunt draws a little bit are there other items on the hot battery bus that is constantly monitoring things like bilge levels that used some energy? Is this amount of current normal?

Nominal draw on the R27-OB is about 11-18 watts. CO detector, Propane leak detector, 2 bilge pumps auto-sensor, the N2k bus, and the battery monitor. Shut all that off (most are on the 24x7 fuse block) and you'll get to 0.

 

[sgeary]

On our 2015 RT31, the 24/7 loads were originally on the Thruster and Starter battery fuse blocks. I believe the factory has since put them all on the House battery fuse block, but I don't know the model year this change was made. I am guessing around 2020.

On our boat the 24/7 always hot loads are: Bilge Alarm, Bilge Pump 1, Bilge Pump 2, CO2 Monitor 1, CO2 Monitor 2, Volt Meter, and Propane Sensor.

If your 24/7 loads are still on the Thruster and Starter battery fuse blocks, it was a straightforward process to switch the hot lead of the Thruster battery fuse block to the always hot side of the House battery switch.

Since our propane sensor was originally on the Engine battery fuse block, it was also moved to the House battery fuse block, but since all the fuse positions were already being used, a separate 1amp fuse was used to power the propane sensor from the 24/7 House fuse block.