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Old 08-14-2017, 04:12 PM   #1
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100aH Limitation...How is SMB getting around this?

In the Merc BEG (Body Equipment Guide) for Upfitters...in Section 7.31 it says:

p.44 of the pdf

http://www.sprinter-rv.com/wp-conten...lines_2016.pdf

"Do not connect batteries with over 100aH directly to the vehicle's electrical system...snip...

...snip...If the system is already equipped with one additional battery, no more additional batteries may be connected without a charging current limitation."

I've read several posts where folks' SMBs have ~200aH (or more) connected to the Sprinter electrical system or have an electrical A/C connected to the add'l batteries running from the stock alternator....to my knowledge, SMB is not installed a B2DC charger limiting current from the stock alternator.

The reason I ask - the upfitter that did my van imitated the SMB system - >
2 x 224ah 6V batteries in series connected to the stock alternator via relay/contactor that closes when the engine is running - this is used to run a 3kW inverter + Dometic 12kBTU roof AC).

Per the BEG, this is not permitted. Overloading an alternator leads to low system voltage and premature failure.

What am I missing?
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Old 08-14-2017, 05:24 PM   #2
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[QUOTE=Per the BEG, this is not permitted. Overloading an alternator leads to low system voltage and premature failure. What am I missing?[/QUOTE]

Perhaps the need for a second alternator or a charge limiter? I wonder if low voltage is bad for the engine like it is for Ford diesels?
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Old 08-14-2017, 05:46 PM   #3
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Quote:
Originally Posted by arctictraveller View Post
Perhaps the need for a second alternator or a charge limiter? I wonder if low voltage is bad for the engine like it is for Ford diesels?
Well that is my point...On some folks' Sprinter based rigs, SMB is NOT using a 2nd alternator....even those without trying to run a secondary AC.

Voltage collapse is possible on any overloaded alternator - I don't have any experience with Fords...but from what I have read, it can cause lots of issues on the Sprinter as many of the sensors rely on a well regulated bus. If one believes the sprinter-source forums, the MBs need a pretty tightly regulated 14.1V to be happy.
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