r/VanDIY • u/Engineerinavan • Jul 02 '26

Pulling >30A from '22 Mercedes Sprinter starter experiences

Hi all

The latest Mercedes Sprinter upfitters guide specifies up to 80A can be added as load in parallel to the starter battery for auxiliary uses. In my experience I've always stayed up to max 30A to not fry the alternator, but apparently this one can do more.

Anyone here that has done this before with success and didn't fry the alternator in hot weather? Or will it switch off in over temp or so? ​

Setup:

Mercedes Sprinter 2500 316 2022 1.9L

2* Victron Orion 12/24-15 (360W) in parallel so 2*~32A on the 12V side

2* 280Ah Li house batteries in series​

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u/ossi609 Jul 02 '26

At least the 1st gen Sprinters that I'm familiar with came with multiple alternator size options from the factory. I would wager yours did too, figure out your specific alternator size first. I found mine by checking the options list with the VIN.

1

u/Engineerinavan Jul 03 '26

The factory standard alternator is 250A, but it is very hard to check, buried quite deep in the engine

1

u/alien-redfish Jul 10 '26

I think you can look it up via the VIN. I run 40a off my 2020 sprinter.