Question 1

My 12v 180 amp alt puts out 12.8v @ 140 amps,will this step up volts to 14.2 (lithium)w/o changing amps?

Accepted Answer

This is not a buck boost or charger.  It isolates batteries (two) such as start and windlass from another, typically larger, bank.  It keeps the fully charged smaller batteries from contributing to the load on the larger battery, typically.

You suffer a small voltage drop but otherwise it's transparent, and any change in incoming voltage would not be dependent on this unit.  If your system is getting 14.2V, these will get 13.5V (0.7VDC drop).

Question 2

Is it possible to hook two batteries in parrallel for charging from one post?  So that 3 batteries are charging on two banks.

Accepted Answer

Yes, we actually have two batteries in parallel on each side with the alternator output connected to the center.  Connected the way you are questioning Will provide the highest charge current to the battery with the lowest charge and this is what you want.

Question 3

can this be use on 2 separate solar battery banks

Accepted Answer

I don't see why not. Hook the charge controller output to the center alternator terminal, then each of the two banks to the other two posts. Make sure all three share the same physical ground and so long as you don't exceed the total amp rating of the isolator it should work fine.

Question 4

Is this unit sealed?   I want to mount it under the hood but I'm not sure if it's water resistant.  It says "contaminant resistant."

Accepted Answer

Yes it’s a sealed unit. I installed mine under my air box on the front side of the passenger wheel well on a 2012 Sierra with no issue for a little over a year now

ASIN	B001FQOGFS
Best Sellers Rank	#2,780,062 in Automotive ( See Top 100 in Automotive ) #3,839 in Battery Chargers
Brand Name	Cole Hersee
Circuit Type	1-way
Color	Blue
Compatible Devices	Truck, RV
Compatible with Vehicle Type	Truck, RV
Connectivity Protocol	X-10
Connector Type	Stud
Contact Material	Copper
Contact Type	Normally Open
Control Method	Remote
Control Type	Remote
Current Rating	120 A
Customer Reviews	4.5 4.5 out of 5 stars (72)
Global Trade Identification Number	00632850311601
Included Components	isolator
International Protection Rating	IP00
Item Type Name	isolator
Item Weight	2.1 pounds
Manufacturer	Cole Hersee
Material Type	Metal
Model	48120
Mounting Type	Rack Mount
Number of Items	1
Number of Positions	4
Operating Voltage	36 volts
Operation Mode	ON-NONE-ON
Part Number	48120
Specification Met	Oem
Switch Type	Mechanical
Terminal	Screw
UPC	632850311601
Unit Count	1 Count
Wattage	4320 watts

Cole Hersee 48120 Battery Isolator

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