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Under shore power, the voltage of the coach battery does not have to get up to 13.4V before the BIRD will open the Trombetta. The voltage from the converter/ charger just has to be above 13.1v for like 2.5 minutes. However, the Trombetta will not open if the coach battery is completely dead. As far as shore power and engine alternator charging, the converter/charger puts out 55 amps while the engine alternator puts out 80 amps. So the engine charges the batteries more quickly.
Under shore power, the power goes to the coach batteries first and then the chassis battery. The reverse when using the engine alternator.
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