0.0V drop through the current range: This negligible voltage drop is far superior in performance in comparison to the old diodes based splitting systems which suffered from a far greater voltage drop Overload Design: The model rated for 180A is actually continually rated for 240A with overload in excess of 2000A Suitable for all alternators and all battery types - simple B+ plug and play Fail-Safe: In the event of unit failure, the engine start battery and alternator remain connected. This ensures the safe running of the boat/vehicle. It prioritizes the engine start battery charging over all other battery bank outputs IP66 fully waterproof The ProSplit R is an advanced split charge management device, developed specifically to deal with the complex nature of modern multi battery systems in boats and vehicles. For single or dual alternator inputs to two, three or four battery bank installations. Complex software with some 1000 lines of code analyses every perceivable condition to ensure charging priorities are managed as you want with specific focus on preserving charge in the engine starter battery. Each input & output terminal is independently monitored to establish status before deciding where charge will be delivered and to prevent discharge from one battery to another. Truly zero voltage drop is one key feature of the Many alternative products claim to have no voltage loss but, under test, are proven not to be so - especially with heavy loads - when it really matters. It may not seem significant but 1V drop equates to as much as 30% lost charging power in a 12V system. Unlike conventional Voltage Sensitive Relays (VSRs), the has the ability to identify and reverse current or over-voltage conditions and disconnect individual batteries to avoid damage or discharge. The ignition sense connection also ensures that the device knows the engine is running and protects the start battery when the engine is off.