Hints and Tips

 

 

Inexpensive Battery Current Meter

The following article first appeared on the Jeanneau Owners Forum and has been reproduced here by kind permission of the author.

 

Although this modification was made on a SO36i, many Jeanneau's from around 2004 may have the same Scheiber electrical panel.

 

On the SO36i, the multifunction electrical monitoring panel has an inbuilt ammeter which is easily activated with the installation of a 50mV/100Amp shunt. The shunt can be installed near the negative connection on the 12 volt electrical panel. Sensing wires are then taken to the multifunction panel. It is important that the shunt is a 100 amp, 50mV type, or in that ratio IE a 200 amp, 100mV shunt should also show the correct reading.

The photos reveal the location of the shunt above the connector panel and how the main connection back to the battery now goes through the shunt. Simply lift the thick black cable off the termination bolt and fix it to one side of the shunt. Take a short cable from the other side of the shunt and connect it to the termination bolt on the top of the connector panel.

The second photo shows the sensor wires going into the connector on the multifunction panel. The black sheathed cable is the sensing cable.

 

I used ~ 1.5 mm^2 (AWG 16) wire for the shunt sense wires from the shunt to a MATE-N-LOK connector - Tyco# 350550-2 (Farnell Electronics Part # 1825355). I crimped and then soldered the wires to these contacts before I inserted them into the back of the connector housing. Caution though, don't insert the contacts into the MATE-N-LOK housing until terminated to the wires as it may be tricky to extract them again. 

The third photo shows the indicator panel with the current indication in Amps located at the top right corner.

 

Note that the indication of current is only active if more than 1 amp is flowing.

This is a really inexpensive and easy way to give an indication of how much current is being used by your electrical devices if you own an SO36i or any yacht with this type of multifunction electrical monitoring panel.

 

It satisfies my need to know what is being drawn from the house battery. It is good to know how much current each device uses and what the total load is.

 

Trevor Bird - Sydney, Australia