[dcbrown]

"The battery can supply more than 400 amps for short periods of time when fully charged, limited by it's internal impedance, life cycle and state of charge."

Since the specification for the battery from the manufacturer states "Max. Discharge Current 230A (5 SEC.)" - I'm not sure I'd be willing to assume the consequences of any discharge rate that exceeds the manufacturers claim as maximum. Just the safety risks alone give me pause.



"The 120 amp circuit breaker is capable of more than that for periods of less than 10 seconds but must be derated for increased temperature. (the breaker is a temperature only controlled device as are all of the self resetting breakers.)"

The bussmann specification for the 120A breaker indicates that at room temperature, the breaker is nominally good with a 200% load for anything from 10 to 40 seconds before tripping. At 125% load, it may run for upwards of 500s or more before tripping or as little as up to 50 seconds depending on individual part. Either limit is within specification. Derating at 100F can be anywhere from -5% to +25% over rated current. Of course there is no graph given for the number of times it has been tripped vs derating. Now that would be interesting! The purpose is as a failsafe device, just design steady state current draw to be under the 120A rating and it won't be a problem -- any short high draw transients won't matter.

Bud