BEST SELLER! A low cost instrument that monitors your High Output Alternator or Battery Charger. It comes with the shunt, wiring, terminals, hardware & instructions for easy installation. Replaces your existing alternator ammeter. Fits standard 2%u201D cutout. Echo-Charge A simple, affordable means of keeping your starting battery fully charged, but NOT overcharged from any charging source. The Echo-Charge works perfectly with alternators, solar, wind or water powered generators or with conventional shore power chargers. The Echo-Charge monitors a starting battery%u2019s state of charge and supplies just the right amount of charging current from the house bank, so you%u2019ll always have starting power to spare! It contains logic, so it knows when to charge and when to stop charging based on the starting battery%u2019s charge level. It eliminates the need for isolating diodes. Battery Link The Battery Link is a 100 amp, 2 bank automatic parallel device that senses whenever a charge is being produced. It then connects the 2 banks together so both banks will charge. When the charging stops, it separates the banks. Fully automatic operation, without a voltage drop! The Battery Link is best used with similarly sized battery banks.