Upgrading the 2003 h386 Snake River tank gauges

JimP

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Dec 26, 2014
25
Hunter 386 Barnegat Bay, NJ
I've been doing some upgrades on my h386 and one of the things I wanted to do was get the fuel gauge integrated with my Raymarine system.

Last summer I installed Victron Lithium batteries and the Cerbo GX monitoring system. The GX has four inputs for tank sensors, but they are resistance sensors.

The original Snake River sensors and Gauge Panel are now sold by Tech Edge. Looking at the documentation on their site, I was able to determine that the panel has a 10volt regulator and the sensors return as low as 0 volts for empty and 3 volts for full.

Tech Edge sells a 10 volt regulator for use on their older panels that don't have a regulator.

Victor recently released the GX-140 tank sensor, which is able to take voltage input between 0 and 10 volts.

I did this following:
1. Positive from Tank breaker on panel to the red wire on the regulator
2. Orange Regulator (10V) to Vin on the GX-140
3. Black regulator to Ground
4. Vin Ground on GX 140 to Ground
5. USB from GX 140 to Cerbo GX

For the tank sender connections to the 140, Hunter has already grounded all the sensors and only brings the Vout and Vin from each sensor back to the Snake River Panel.

On my SR panel, each tank has 2 wires from the Hunter harness. I guessed that the 3 wires (1 each tank) were all the 10 volt out wires.

So I took the Fuel Sender wire and connected it to Vin for tank 1 and the orange wire next to it on the SR connector I connected to Vout for Tank 1.

IT WORKED!

I repeated for the water tank on Tank 2.

For Tank 3, the GX-140 puts out 24volts, so I bridged the Waste orange wire directly to the 10Volts on the regulator and only connected the Waste Sender wire to the Vin pin on the GX-140.

In the Cerbo you need to configure the full and empty voltage readings (Just like calibrating in the Snake River Panel) and the tanks size, fluid type and if desired you can calibrate for non-square tanks.

Once that was completed, I now had tank readings on the Cerbo.

To get the fuel reading on the Raymarine i70, I also added the Victron Can to NEMA adapter and then adapted that to Raymarine STNG. The Cerbo now sends Fuel, Battery and Inverter info onto the i70s.

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May 17, 2004
5,736
Beneteau Oceanis 37 Havre de Grace
Very nice setup. I have a Raspberry Pi that I’ve used to monitor water tank levels for the last couple years. This winter I’ve added an NMEA2000 output adapter to it so I’m able to send data from the Pi out to my plotter. I was just at the boat yesterday playing around with that a little.
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