Replacement for Airpax Dimensions WIN-12X20B3R1T

Updated 04/11/2026 | Published 04/06/2026

Question:

Hello. I have a 2008 Winnebago Tour 40wd with Dimensions 2000w model win-12x20b3r1t. Came new with coach. I need to replace it. I have normal flooded batterys 3 of them. 31 group. This one is not made anymore. What do you recommend to replace it that is comparable. Thanks Brendan

asked by: Brendan M

Airpax Dimensions WIN-12X20B3R1T
(click to enlarge)

Expert Reply:

Hey Brendan! What you have now is an Airpax Dimensions WIN-12X20B3R1T inverter/charger with a built-in transfer switch. For a comparable all-in-one option we have the Victron MultiPlus # VN69ZR. This combines all three functions in a single unit and is the most direct modern equivalent.

The Victron MultiPlus can be mounted either vertically or horizontally, but vertical mounting is recommended for proper cooling. I'm not sure if you have that on the floor or wall based on your pictures, but either will work. This measures 19-15/16" tall x 9-5/16" wide x 5-5/16" deep if you want to double check and make sure you have enough space.

Where are you headed next with the Winnebago?

expert reply by: Robin H