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Battery monitor

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holby View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote holby Quote  Post ReplyReply Direct Link To This Post Posted: 27 August 2014 at 17:33
Simon, Welcome to the World of Sailing.... You are totally correct... Nobody agrees.... ClapLOLLOL
Hanse 301, tiller steering, Volvo 2010 (10hp)
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Rubato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 27 August 2014 at 17:57
A shunt type system is the most accurate and shouldn't be a hazard if installed properly. Voltage only monitoring systems are helpful to understand the state of charge and guesses at current based on a 'model" for the battery. Unfortunately, the battery won't behave like the model when it ages.
 
Simon, yes you need an extra heavy gauge wire. The 2 house batteries will be connected in parallel already; both negatives together and both positives. You want to put the shunt in series with the current negative lead that goes from the 2 batteries to the boat negative. The capacity you program into the monitor is the capacity of each battery added together.
 
Cheers, Steve
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Samtutuki View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Samtutuki Quote  Post ReplyReply Direct Link To This Post Posted: 27 August 2014 at 22:21
Originally posted by Rubato Rubato wrote:

A shunt type system is the most accurate and shouldn't be a hazard if installed properly. Voltage only monitoring systems are helpful to understand the state of charge and guesses at current based on a 'model" for the battery. Unfortunately, the battery won't behave like the model when it ages.

Well that is a very big call!!

You might be interested to read this very informative article:

http://pbase.com/mainecruising/smart_gauge
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Rubato View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rubato Quote  Post ReplyReply Direct Link To This Post Posted: 28 August 2014 at 17:58
Very cool article and clearly some excellent work has gone into the Balmar device (which I would expect, they're a quality company). I had to laugh at some of the statements though. After providing all sorts of in depth analysis on how Ah counters can screw up he makes the following statement about the SmartGauge  " is way to complex for a guy like me who can't even figure out gmail.."   He also doesn't give much credit to those who install and use the Ah style devices. Thankfully, my installation doesn't look anything like those pictured in the article and I manage to avoid many of the issues he points out as possible traps. As with any measurement device, one has to understand the limitations, proper use and accuracy. Personally, I want to know the currents; both charge and discharge in addition to voltage and SOC.
Thanks for the article though, the Balmar device is impressive and is certainly extremely simple to install and use. For those who only want a SOC indication (with voltage), it's an excellent way to go and would seem to avoid the problems I've seen in the past with simple voltage monitoring which was the basis for my statement above.
Steve

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Wild View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wild Quote  Post ReplyReply Direct Link To This Post Posted: 30 August 2014 at 09:29
he Simon

yes you have to put in 330 Amp total capacity of the battery bank.
like somebody onthe forum already explain you need a short(so short as poss) from the neg connetion of the battery to the shunt(tak care that you do this on the right side of the shunt as explain in the small install guide if this direction is a problem you simply can remove the small elect print by the 2 screws and turn this 180 °)
I try to send you some pict of our installation

Wild
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simonpickard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonpickard Quote  Post ReplyReply Direct Link To This Post Posted: 30 August 2014 at 19:18
Hi Wild.

Got it installed today! Working well.

So are the 2 house batteries I have (165 each) in series then? I was told on the cruisers forum that if in series you need to put in 165 and not 330.

Also... Do you find your volts on the battery monitor are a bit less (.2 or so volts) than the panel voltage display?

Regards,
Simon
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simonpickard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonpickard Quote  Post ReplyReply Direct Link To This Post Posted: 30 August 2014 at 19:19
Originally posted by holby holby wrote:

Simon, Welcome to the World of Sailing.... You are totally correct... Nobody agrees.... ClapLOLLOL

haha, just saw this! In many ways it's why I find it interesting! Keeps you on your toes and makes you really research for yourself.

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Fendant View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 30 August 2014 at 21:52
Simon,
 
I also have a difference of .2 Volt between the Würth panel display and my batt monitor. I measured it with a professional Voltmeter, the BCM monitor is right Smile
Frank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote simonpickard Quote  Post ReplyReply Direct Link To This Post Posted: 30 August 2014 at 21:58
Thanks Fendant, good to know.

So in terms of the two house batteries, what did you set yours to? Are they series or parallel?
Should I set the BMC to 2 x 165 (330) or just 165?

Regards,
Simon
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 30 August 2014 at 22:50
Of course parallel, series would result in 24 V!  I have set the batt capacity correspondingly to 330 Ah.
Frank
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