Bob -- when on shore power the converter charging g circuit also charges the chassis battery. It uses the BIRD and Trombetta just like when driving and the engine driven alternator keeps the house batteries topped off.
I posted a thread in the Motorhome Tech Topics area called "What charges the chassis and house batteries when" that describes how the BIRD and Trombetta work together.
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Ed & Bev Felker
Retired USAF Col and retired Nurse
Traveling with Lily & Bella ('Teddy Bear' breed)
2015 Vegas 24.1 (E-350)
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