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Diode isolators
The diode isolator completely isolates each battery circuit from the other so when one battery is used (even if it is dead) the other, will remain fully charged.
Diode isolators act as a one way valve between the two batteries, preventing current flowing from one battery to another. Each battery is therefore isolated and acts as an independent power source.
Diode isolators have been around for years, and suit externally sensed alternators. They are not recommended for many modern systems, however their simplicity and long life ensure their place in the market. At Piranha we manufacture our own brand and it is excellent value for money.
Problems associated with solenoid or manual systems occur when paralleling two batteries; one fully charged and one flattened (by running accessories). We must allow both batteries to equalise, like tanks of water, before they recharge. They then charge up very slowly as one enormous battery. This creates a disadvantage in that the batteries compete for power during recharge. Diode isolators have a different problem, there is a voltage drop associated with the use of blocking diodes.
Problem: To use a Diode Isolator requires a modification to original wiring. If the diode fails there is a complete loss of your charging system.
Note: Most modern vehicles, EFI or diesel, now have internally sensed and regulated alternators that do not suit diode isolators.
In the mid 1980's Piranha introduced the first Electronic Isolator (the DBE 100S now obsolete) that revolutionised the way Dual Battery systems worked. Electronic Battery Management Systems now work on the same basic principals as this revolutionary product.
