Battery monitor

Discussion in 'Tech/Mech General' started by stevec, Jul 26, 2015.

  1. stevec

    stevec Funster

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  2. andy63

    andy63 Funster

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    Yes they were linked in a thread a month or so back and I thought it would be worth a look..
    Had a look at the instructions when it arrived and the initial calibration seemed a bit involved... especially the ammeter function, it mentioned a current of around 280amps been used.. not really feasible. Just not sure how important that calibration will be,and I put it to one side to play with at a later date...
    I have the Stirling pmp fitted but might replace it with this unit just as a comparison as it's only a fraction of the price...
    Sorry can't be more help just yet..
    Pic of the bits that arrived..
    Ta Andy. .
    20150726_194611.jpg
     
  3. Techno

    Techno Funster Life Member

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    Usually the set up involves inputting the total battery capacity (AH) and setting the current reading to ZERO when you are sure nothing is going in or out.
     
  4. Old Soldier

    Old Soldier Funster

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    Hi Andy. Do you know if it can be inserted to part of the 12v circuit or does it need to be mounted across the leasure battery terminals?
    Thanks.
     
  5. Techno

    Techno Funster Life Member

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    Usually at the battery and ALL the -Ve's have to go on the Shunt so only one negative connected to the battery
     
  6. Techno

    Techno Funster Life Member

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    Typical BM-1 arrangement. See here I've used a busbar to accommodate all the negatives from one side of the shunt. The other side of the shunt goes on its own to the battery negatives
    [​IMG]
     
  7. Techno

    Techno Funster Life Member

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    My BM-1 came with the van but personally I would not have bothered. The voltage reading on my overdoor panel tells me all I need to know.
    Anyone who understands on load off load daylight night time voltage readings needs nothing more
     
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  8. Old Soldier

    Old Soldier Funster

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    Thanks Andy. My battery is mounted under the drivers seat so don't think it would be suitable for me.
     
  9. Techno

    Techno Funster Life Member

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    Don't envy anyone that has one, as I said I would not bother
     
  10. andy63

    andy63 Funster

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    Hi andy, that may be so , but the number of posts ive read about people asking about the state of their batteries and their electrical usage has always prompted me to say that the best way fwd is fitting a pmp...
    that way all the guess work is taken out of it with the net amp hours displayed at any one time... some of the voltage indicators in vans are just an led ladder and to me never seem adequate..
    I find the stirling panel in the van great ...reminding me that things are switched on I meant to have off just by looking at the current reading, and always displays the net amp hour reading on the leisure battery bank.
    just my thoughts but see what you are saying..

    on the cheap pmp mentioned above they say it needs calibrating for zero and high current and with the 300amp shunt version suggest a current of 280amps for the high current which would be difficult to achieve..
    they also say you need a 33v source to calibrate the low and high voltage settings...ive put it away for now but would like to try it as its a lot cheaper than the normal pmp available
    ta andy.
     
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  11. Techno

    Techno Funster Life Member

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    If I start the evening after Sun down with 12.6 volts no load I'm a happy bunny (y)
     
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  12. IanS

    IanS

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    I've got a Nasa BM2 and love it, yes it's stupidly expensive, but I never use hook ups so knowing at a glance how the solar panel is charging, the state of charge and my current drain in the evening is well worth it. The BM2 will also tell you the starter battery voltage, nice to know when parked up for a few days
     
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  13. Lenny HB

    Lenny HB Funster

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    I have fitted the 50 amp version in my van, works well only critisism is the sample rate is high and not adjustable.
    They come calibrated and if you do need to do it ,it is quite easy.
     
  14. IanS

    IanS

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    Certainly a good price, with the shunt actually in the unit, it would be best mounted close to the battery with heavy cables, the advantage of the BM2 is it can be mounted remotely. It's also a nicer LCD display and just fun to use (maybe that's just me)
    I like the marine stuff because of the quality and reliability, a flat battery could be a bit inconvenient on a boat, but it is costly
     
  15. stevec

    stevec Funster

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  16. IanS

    IanS

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  17. stevec

    stevec Funster

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    Andy,
    You have the LED unit. Any idea if the LEDs are lit all the time (and therefore taking more current) or do they go off until a button is pressed? Concerned about the amount of current drawn over a long period of time. Maybe need a switch fitting.
     
  18. Lenny HB

    Lenny HB Funster

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    Shunt is separate mounted mine next to the batteries and meter on the panel with all the other controls.
     
  19. Terry

    Terry Funster

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    You are concerned over the LED panel drawing current ?:eek::(
    I have a very different approach ;) if I turn on a switch and it works it's OK (y)if not then I HAVE A PROBLEM:D Not concerned about what reads what,only got a very basic swing thing that shows red,amber,green -so long as it's in green it's OK by me :LOL::LOL::LOL:
    terry
     
  20. stevec

    stevec Funster

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    Terry, I'm an engineer and I like numbers! I've had a Tracer MPPT regulator and display in my current van for 15 months and still look at it regularly. I'm disappointed that my replacement van only has a simple analog meter as a monitor as opposed to my current Sargent display. Gotta have some numbers to look at!!
     
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