![]() ![]() The important thing when connecting the shunt is that nothing is connected to the battery side of the shunt.Įverything, including solar panels and battery chargers, must be connected to the load side, otherwise the marine battery monitor cannot measure the input and output accurately and so may give incorrect readings. A surface mounted box is also available if you want to avoid cutting large holes in your bulkhead If access is difficult then the white plate can be clipped to it and screwed into place with the four small holes. It is reversible to allow for bulkheads of different thickness and does need access to the back of the unit. There is a reversible ring that screws onto the back of the display. The Victron display and the options for fitting it. The software translates the measured 0 to 50mV to the current of 0 to 100A. Using Ohm’s Law its resistance is V/I = 50mV/100A =0.0005 Ohms. This states that Amperes (I) = Volts (V) / Resistance (R).Ī shunt may measure 100A, and the voltage drop for 100A may be 50mV. ![]() The central part is a shunt, a low resistance connection between the negative pole and the rest of the electrical appliances connected to the battery.Īs the resistance is known and the voltage drop across the shunt can be measured easily this allows the calculation of the number of amps going in and out of the battery using Ohm’s law. ![]() Marine battery monitors are more expensive depending on the manufacturer and the facilities they offer. Voltmeters are inexpensive, indeed many boats have a voltmeter built into the chartplotter. If you have a small glass absolutely full the voltage will be high, however there is not much water in it.Ī larger glass full of water will also register the same high voltage, but a battery monitor will tell you that there is more water in the glass. The best way to imagine the difference is to think of a glass of water. For all but the smallest and simplest of craft a reliable supply of battery power is essential to keep both… ![]()
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