Best Portable Unit To Charge And Jump Start Motorhome Coach Batteries That Go Dead In Winter Months

Published 01/28/2026

Question:

Hi! We store a motorcoach and a couple larger trucks outside all winter. Batteries seem to struggle even when they’re relatively new. Is there a portable solution that actually works in the cold?

asked by: Mike

Expert Reply:

Hey Mike! Cold weather is brutal on batteries, especially when vehicles sit outside.

For that kind of setup, the Projecta Intelli-Start 3,000A jump starter # VX55NR is a really strong option. It’s built for heavy-duty use and handles large 12V engines up to 12 liters, as well as all standard 24V gas and diesel vehicles, which covers motorcoaches and larger trucks well. When the battery is run way down, you can use the manual override mode to apply power long enough to wake the battery back up before starting.

Once the engine’s running, the jump box recharges itself from the alternator, so it stays ready even if the vehicle goes right back into storage. That makes winter use a lot less frustrating than with smaller jump starters.

How long do the vehicles usually sit between starts?

expert reply by: Andrew N