Is 40A Or 55A Converter Power Center Better For 2 12V Batteries In Parallel In Camper?

Published 02/24/2026

Products Featured in This Question

WFCO Auto Detect RV Converter and AC/DC Distribution Panel - 12V - 55 Amp

(44)

$274.99

WFCO 40A Auto-Detect RV Power Center with 30A Main and 13 DC Circuits

$311.94

Question:

I’m running two 12V batteries in parallel. Should I go 40A or 55A? old one stopped charging. not sure if it was overworked or just old.

asked by: Brandon

Expert Reply:

Hi Brandon, with two 12V batteries wired in parallel, stepping up to the WFCO RV converter AC/DC power center # WF86FR 55A makes sense. The extra 15 amps of DC charging capacity helps recover the bank faster - especially if you need to charge quickly such as on short generator runs.

One thing I'd check is your converter cutout space to make sure you won't have to do lots of trimming or modifications (sometimes it is inevitable though). This unit requires a hole sized to 12-3/16" wide x 11" tall.

If your cabinet opening is vertical-style or you need more circuit positions, the WFCO # WFC72GR 40A vertical may be the better fit. It requires a hole sized to 7-13/16" wide x 11-5/16 tall.

Are you mostly on hookups or mixing in boondocking?

expert reply by: Andrew N