Tiffin motorhome batteries: Allegro, Phaeton and more

Tiffin Motorhomes was founded in 1972 by Bob Tiffin in Red Bay, Alabama, and became part of Thor Industries in 2020. Tiffin is best known for Class A motorhomes: the gas Allegro and Allegro Open Road, and diesel coaches like the Allegro RED, Phaeton, Allegro Bus and Zephyr. It also builds the Wayfarer Class C.

Battery setups

Tiffin diesel pushers usually have separate chassis batteries (often multiple large batteries) and a house bank, both in exterior compartments. Gas Allegros have a chassis battery and house batteries in separate locations. Many Tiffins have inverters that run the 120-volt side off the house bank.

What we see in Florida

Diesel chassis batteries. Two or more big starting batteries that wear together. When one goes, we usually recommend both.

Inverter drain. Leaving the inverter on in storage can run the house bank down fast.

Snowbird storage. Many Tiffin owners winter in Florida and store the coach in summer.

Boost and isolator issues. If the chassis and house batteries seem to drain together, the boost solenoid or isolator may be the cause. See testing.

Upgrades

Lithium house banks are popular on big Class A coaches. Lithium upgrades on these coaches usually involve the inverter-charger settings and alternator charging.

Fitment note: Battery locations, tray sizes and electrical packages vary by model, floor plan and model year. Treat this as a general guide, not a fitment guarantee. We confirm what your RV has before anything is installed.