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Old 10-20-2014, 10:08 PM   #1
Gamma1966
2013 Chassis /14 Unity MB
 
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Arrow Trickle Charger for Sprinter Batteries

While on my trip back from the LTV rally in Winkler, I experienced a "Dead Battery" situation. I left a cooler plugged in over-night, using the power outlet below the Radio console, which is fed from the Engine Batteries. I was able to "jump start" the engine starting battery using a cable from the "Battery Boost Point" located in the engine compartment and my coach Battery system under the floor in the van. I made the jumper cable from a 30 Ft #2 welding cable and a pair of insulated Alligator Clamps; which I now keep stored in the driverís door storage compartment. I have since made up another single jumper cable, stored in the passengers door storage compartment, in case I need to jump start another vehicle from my Van.

While at the LTV rally I met with one owner who had hooked up a trickle charge system using the power of the coach batteries to "trickle Charge" the engine starting batteries. Perhaps that owner, or others may have also done this; if so can they share the details of how they accomplished this feature.
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Old 10-21-2014, 03:31 AM   #2
aljimenez
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Default Re: Trickle Charger for Sprinter Batteries

A different solution: search Trik-L-Start for a device that charges the engine battery as long as the house batteries have plenty of juice as when they are on charging with external power. I installed one in my now sold Pleasure Way and it is covered in this post:

http://www.sprinter-source.com/forum...t=Trik-L-Start

I have also installed this device in my current Serenity. I never have to worry about my engine battery discharging any more... Al
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Old 10-21-2014, 04:34 AM   #3
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Default Re: Trickle Charger for Sprinter Batteries

I was going to install the Trik-L-Start, but since I have solar capacity using the Blue Sky SB3024 solar charging controller I used the 2 amp auxilliary chassis battery charger. When the coach batteries are in acceptance or float charging, 2 amps are diverted to charge the chassis battery.

The Trik-L-Start is a good solution for your application.
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Old 10-21-2014, 07:34 PM   #4
joeframer44
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Default Re: Trickle Charger for Sprinter Batteries

Pardon me for becoming confused once again. Is it not the case that if we are hooked to shore power in storage that the converter/charger ( 3 stage currently used in the newer Unitys) will keep the house batteries safely charged, and 'trickle over' to also top off the chassis battery as long as the house battery switch is left ON?

Until I can understand all of this I'm not sure if I shouldn't turn off the main breaker to my real house so I don't use up all of the electricity coming in from the pole!

Joe
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Old 10-21-2014, 08:10 PM   #5
cdcorpe
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Default Re: Trickle Charger for Sprinter Batteries

Only the house batteries charge when plugged in. M/B supplies a disconnect behind the gas (diesel) pedal.
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Old 10-21-2014, 08:44 PM   #6
Peter Tourin
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Default Re: Trickle Charger for Sprinter Batteries

Too true! My MB sat for several months on shore power without being started - and when I arrived and tried to drive away, the chassis battery was quite low. My 2012 has the isolator with the emergency switch that feeds house power to the engine in this circumstance, so I was on the road - and of course, the chassis battery then came right back up. So I can't speak for all Sprinters, but mine certainly doesn't charge the chassis battery from shore power. There are several other threads here about this, mostly discussing the Trik-L-Start IIRC...
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Old 10-22-2014, 01:12 AM   #7
Gamma1966
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Arrow Re: Trickle Charger for Sprinter Batteries

Jackfish talked about he had a --> Blue Sky SB3024 <-- charge controller installed in his Unity; can he show us where it is physically installed? I am looking to replace the LTV supplied GO Power SC30 Charge controller. The Blue Sky unit is physically bigger than the GO Power charge controller, so I am interested to see where it was installed in the coach?
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Old 10-22-2014, 02:22 AM   #8
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Default Re: Trickle Charger for Sprinter Batteries

My system is discussed here: http://sprinter-source.com/forum/showthread.php?t=27186 There are photos of the batteries, inverter and controller in the same compartment you put those extra batteries.
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Old 10-22-2014, 03:18 AM   #9
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Default Re: Trickle Charger for Sprinter Batteries

I love my Blue Sky, but I waited until the 3000i was available. It too has the 2 amp trickle, but I purchased the trik-l-start too as it is separate and allows my chassis to charge from any source, not just solar. I like distinct systems that work when others go on the fritz. Plus I use the other circuit to drive my fridge off battery until the battery runs too low and then it turns off the fridge, preserving the bottom half of the battery from being eaten in case I leave the fridge on 12v when I am at the in-laws.

-Randy
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Old 10-22-2014, 05:05 AM   #10
joeframer44
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Default Re: Trickle Charger for Sprinter Batteries

Any tips on installing the Trik-L-Start in the Unity MB specifically?

Thanks.

Joe
2014 Unity MB
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