Preventing Failures:
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Common Electrical System Faults:
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In Mobile and Marine power systems, Undervoltage conditions occur during engine cranking, during the application of heavy electrical loads, and by the gradual loss of battery capacity. According to Military Standards, the battery voltage (with the engine OFF) in a properly operating 12 Volt system can drop as low as 10 volts. In a 24/28 Volt system, it can drop to 20 volts. But, during engine cranking, the battery voltage can drop to 6 volts! (see below) 

This undervoltage can play havoc with electronic equipment. Therefore, the STO-P UPS40 series of Power Fault Protectors incorporates an internal backup battery to provide 'fill-in' current during undervoltage conditions. A minimum of 45 Amps can be produced for short periods of time. For greater capacities, a larger external battery can be employed. Switching is instantaneous - the backup power source is always 'online' - so there is never an interruption of power to the equipment.

Because of its smaller physical size, the STO-P PFP15 series uses an external user supplied battery for backup power. It supplies a maximum of 10 amps of 'fill-in' current to equipment susceptable to undervoltage. (A total of 15 amps is available to susceptable and non-susceptable equipment via two separate leads.)
 
 

         
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