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Old    "G" (grant_west)      Join Date: Jun 2005       12-18-2013, 3:44 PM Reply   
Hey in my recent GEM car restoration project (Electric Car) I have come across a bunch of cool battery guru's & battery tech. In the electric golf car & electric car world battery monitoring systems are very common and much more Hi-Tech then anything I have come across in the 12v Stereo world.

And example is this Batt Six (BMS) module. They have 2 System's

#1 a Heads up 6 inch display unit. It gives you digital TFT display that shows you real time INDIVIDUAL battery voltage and strength

#2 A blue tooth unit that send's the battery info to your smart phone Android or I-phone.

Currently these unit's are set up for Battery systems running in Series, Our boats run our 12v ststem's in parallel.

Here is a look at the Smart phone display
Attached Images
Old    "G" (grant_west)      Join Date: Jun 2005       12-18-2013, 3:45 PM Reply   
Here is a Pic of the Heads up or Dash Display Unit.
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Old    "G" (grant_west)      Join Date: Jun 2005       12-18-2013, 3:55 PM Reply   
This unit will show you instantly (in real time) each battery's condition. It can point out the week link in your battery bank. Often times these battery's can be addressed by removing them from the system and (charging & discharged) untill they once again become balanced with the rest of the system. OR removed and replaced. Often 1 week battery can drag down your entire system & sometimes destroy a entire bank of battery's. the Idea here, catch a small problem before it becomes a bigger more costly one.
They even make a data logger that records battery history on a Scan Disk and you can look over your discharge patterns and spot problems if you dont want a smart phone or display
Attached Images
Old    "G" (grant_west)      Join Date: Jun 2005       12-18-2013, 4:01 PM Reply   
Now before you get all excited and want to run out and spend $300 or $400 on this cool new toy! Wait did I just loose 1/2 of you at $300 or $400 This product dosn't exist in our configuration YET!!! It exist's in a Series configuration right now, you can buy it off the shelf. Mabey someone knows of a product like this that does.? Im sure if demand was high enough they could re-tool this BMS to work in Parallel systems
Old    Jack Flap (flapjack)      Join Date: Feb 2010       12-19-2013, 6:41 AM Reply   
You realize that getting voltage of the battery is easy in series but very hard in parallel?
Old    "G" (grant_west)      Join Date: Jun 2005       12-19-2013, 8:00 AM Reply   
I understand how battery's in series are separated and measured.
The monitor has a lead for each battery. The monitor measures the voltage difference between the first battery and the second battery and so on. That's the way it was explained to me. I'm sure battery's can be measured in parallel it would just take some special programming and hardware. Like I said I'm sure if the demand is enough it could become a reality.
Old    Detox (bass10after)      Join Date: Feb 2010       12-19-2013, 6:28 PM Reply   
grant who makes this system? do you know if it works for 2v batteries and different types of batteries as well? Thinking this would be awesome for my houseboat with 12 2v batteries that aren't all that easy to get to...
Old    David (DavidAnalog)      Join Date: Sep 2013       12-20-2013, 11:39 AM Reply   
In an open series circuit you can measure each component individually. In a parallel circuit, whether open or closed, you cannot isolate and measure each component without introducing a disconnect.
Old    Trayson Harmon (trayson)      Join Date: May 2013       12-20-2013, 1:18 PM Reply   
Well, I only have 2 batteries... And they are on a switch so they tend to run isolated the vast majority of the time. I bought a couple of these 12v LED voltage gauges for under $5 each off ebay. My batteries are under the observer seat, so I mounted the gauges in the base of the seat. Cheap, simple, effective.

Just thought I would throw out a related solution for those of us with a lot simpler systems that are down for a cost effective solution.

Old    "G" (grant_west)      Join Date: Jun 2005       12-20-2013, 5:42 PM Reply   
^^trayson^^ for people with 2 battery's that's a great option. But for the rest of us with Multi battery banks that's not a option. And with ur option you can only see the voltage when they are broken apart. The idea behind this product was to be able to see the battery's under load in real time.
Old    Mikeski (mikeski)      Join Date: Aug 2003       12-20-2013, 7:34 PM Reply   
For batteries in parallel it makes more sense to use ammeters to see how much charge is going in or how much is coming out of each battery. This would require a shunt on one terminal of each battery then a unit that could read and display current draw or delivery. It can be done for probably about $30/battery. Here is a display that could possibly be configured to do what I am talking about.


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