Mixing 32V Radar with 12V electronics

[pmurphy]

I'm removing an old Furuno radar and replacing it with a Garmin. My Garmin chartplotters of course run on 12V. The Garmin radar has a power input range of 10.5-35 VDC. I have a 32V power feed on the flybridge from the removal of the Furuno but I don't have a 12V feed there. I'd like to feed the Garmin radar with 32V. Has anyone ever done that (ie having the chartplotters running on 12V and the radar on 32V)?

 

[Captain Ralph]

If I understand your post correctly, your replacing your 32Vdc radar with a unit that will run on32Vdc?
Or, your display is 12Vdc only yet the array can run on 32Vdc?

If running an 32Vdc array with a 12Vdc display, there should not be a problem as the data or signal levels will still be at a another signal specific level.
The important issue is all share the same negative or common bottom voltage level.

I had a 24Vdc, 10Kw array, My displays were 12Vdc. All good.

Next concern; as we have learned the hard way about things that workup to 32 Vdc (LED lights), They fail at 35+Vdc. Are we looking at an array that will work on a 32Vdc system ( levels to 38+Vdc) ??
Or an array that 32Vdc max??

 

[Cricket]

Looks like Capt Ralph is all over this one. All of our electronics are Simrad on both boats which both have 24v radars attached to 12v networked mfds.

 

[rsmith]

Call Garmin. I added a FLIR unit that blew up my 8612 garmin told me I needed an isolator while the night vision co said no. I should have double checked with garmin first. Don’t rely on internet information for stuff like this. You get what you pay for.

 

[jmooney]

Does the Garmin mfd have a power supply to the radar unit ? I have Furuno mfds , black box and 12 in mfds . They have a 48 volt supply to the radar scanner. The mfds can be either 12 v or 24 v powered , but the supply from the mfds to the radar is always 48 volt .

 

[Pascal]

Because there are a number of electronics that only run on 12 volts (many VHFs, stereos, etc) I ve run a 12 v feed to subpanels at both my helms. Both are fed by the 12v gen battery with a main breaker close to the battery. This way I can power any 12 volt device I may install in the future. Also, that gives me a single feed at each helm for all electronics instead of having multiple feeds. Running new wires thru the chases is no big deal

Never understood why most vhfs are 12v only

 

[pmurphy]

Does the Garmin mfd have a power supply to the radar unit ? I have Furuno mfds , black box and 12 in mfds . They have a 48 volt supply to the radar scanner. The mfds can be either 12 v or 24 v powered , but the supply from the mfds to the radar is always 48 volt .

The Garmin Chartplotters are independently powered with 12V. The Radar has it's own power input from an external source, not from the Chartplotter.