(note this higher voltage, not a problem in this case, but the phenomenon will cause a problem outlined in later examples). However note that the engine battery is 13.6 volts. The important voltages to note for example 1 is the fact that the alternator produces 14.2 volts, but by the time it gets to the domestic battery it is only 12.8 volts, this is a appalling voltage and would result is you never charging your battery bank & shortening the life of your batteries. The alternator voltage is assumed to be about 14.2 volts, however in real life this could vary from 13.9 to 14.8 volts depending on the manufacture and the internal regulator fitted to the unit. The test assumes the alt is a 60 amp alternator, the diode is a 70 amp diode and there is average cable run between the alternator and the battery bank. Please find a few examples below:Įxample 1 is a typical split charge diode installation with a standard alternator with no advanced regulator or battery sensing regulator. To understand what this product does we must first understand the problem. Having introduced 2 or 3 battery banks onto your boat, the problem then is how do you charge them from one alternator source (additionally, we offer these units w/ 2 alternator inputs, allowing two alternators to combine and charge a single housebank). These tend to be the engine start battery, the domestic battery bank (please note that if you join three or four batteries together in your domestic battery bank it is still one battery), and the bow thruster battery. What is the problem? Voltage drop across splitting systems (such as diodes) will cause poor performance with the charging of the batteries, however this can be compensated for by using things like advanced regulators or battery sensed alternators, however this in its self can cause problems with other batteries in the circuit.Īll boats have at least two battery banks some have three. Under normal operation the unit has a simple operating mode, however like all Sterling product being engineers we are not only concerned about normal operation conditions we like to build into our products as much safety and control as possible to both protect your electrical system and ensure the available power is directed to where it is required most but also ensuring that the engines battery is always charged. This unit on the surface looks like a simple device however this is a very complex software control device with in excess of 1000 lines of code. The Mastervolt battery mate is as high as 0.6 volts at full power (where it counts) while the Sterling is at 0.09 volts under full load conditions, a 600% performance improvement over the “Mastervolt” unit. Many so called 0 volt drop systems simply do not come close. It does all this and still offers only a max voltage drop of less than 0.01 volt, much less than any so called 0 volt drop mossfet / diode system. The system also has the ability to disconnect the alternator and individual battery banks in the case of problems caused by the alternator or other power items in the system. This product uses a micro processor to monitor the multiple battery banks which are to be charged by an alternator, it ensures the batteries are all charged in conjunction with each other and prevents any back feed through the device in the event of high loads on one battery bank. What is a Zero Volt Drop Battery Isolator / Intelligent Digital Alternator Distribution System?
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