Thor Forums

[bevedfelker]

Scrub -- you need to get yours checked because something is not working correctly (probably the Trombetta for the chassis battery).

The RV has two sources of power to charge chassis and coach batteries -- engine driven alternator (when driving down the road) and the charging circuit of the converter (when connected to shore power or when the generator is running).

The BIRD work in conjunction with two Trombrettas (one for chassis battery, one for coach batteries). The BIRD basically monitors both battery banks and when the voltage drops indicating one of the banks needs charging, it signals the corresponding Trombretta to close sending charging voltage to the battery bank needing charging. When the battery bank is fully charged, the Bird will signal the Trombretta to open and isolates the battery so it doesn't overcharge.

The converter's charging circuit should provide trickle charging to the chassis battery when you are on shore or generator power. The BIRD would detect when the chassis battery voltage is below fully charged, then it signals the Chassis battery Trombretta to close sending power from the converter to the chassis battery to top off its charge.

There have been several folks on the forum find out that their Trombrettas were not wired correctly. In essence, the house and chassis batteries should be receiving charging voltage from wither the converter or the engine driven alternator depending on need.

This interlay of charging voltage sources, BIRD, and Trombrettas is why I called this thread "What Charges the House and Chassis Batteries When." when I first posted it.