Marine battery isolator diodes12/18/2023 ![]() ![]() Solenoid B connects the second battery to the distribution block. Solenoid A determines whether the second battery is connected to the rest of the charging system or not. This type of isolator uses large high current relays to control the flow of current. Some diode type isolators have a fourth terminal which controls the current flow through the device. The diagram below shows the connection for the diode based isolator. 6 volt loss which means that the batteries will not charge to as high a voltage as when they are connected directly to the alternator. The diode based isolator has the advantage of long life and trouble free operation but many of the diode based isolators cause a. This type of isolator is basically two very high current diodes in a heat sink. The diode based type and the relay (solenoid) type. There are 2 main types of battery isolators. Now 3 amps of current isn't much but if you're using 2 solenoids and you're already having trouble with a weak alternator, it'll just add to your problem. Some coils may pull as much as 3 amps of current. ![]() Solenoid type isolators don't have as much voltage loss as the diode based isolators but the solenoid coil does pull current. This loss of voltage will dissipate power in the form of heat and unless you're freezing to death, it doesn't help matters. Diode type isolators will usually have a small voltage drop across the diodes (approximately. Most of the time they will actually rob power from your system. Battery isolators only prevent draining your starting battery when playing your system with the engine off. ![]()
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