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Thread: Battery monitor

  1. #71

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    Use of our 3000w inverter (running microwave pulling 80 amps or so)
    Was the main reason I bought our NASA....
    To keep an eye on the 3 x 100ah batteries

  2. #72

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    Quote Originally Posted by grahammay2 View Post
    Sargent EC 480 & ec500. I do have a 2k inverter fitted directly to the lbatts which wouldn't go through the meter.
    Graham
    That's daft. Unless you monitor all the use, there is no point in doing it at all.
    The meter may be able to monitor slightly higher currents than it can display, but of course you can't run a 2KW inverter (max current around 200A) through a 30A meter. That's overloading by an order of magnitude.
    You need to buy a monitor that can monitor everything.

  3. #73

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    Quote Originally Posted by wildebus View Post
    Once which looks very interesting and I am going to get to see how the info matches my BM-712 is this device
    Wireless Battery Monitor Meter DC 120V 300A VOLT AMP AH SOC Remaining Capacity 732140270639 | eBay
    It doesn't use a shunt, you simply route the battery -ve cable though the sensor. It looks promising, would be very easy for anyone to install I suspect, and is cheap for what it promises. (just like HDs one, there are different options with different current ratings at slightly diffrent prices). There are monitors identical to the one above that DO use a shunt however, so need to check carefully if you want one type over the other.
    I just got home from a trip away to discover that the one of these I ordered has been delivered via the Slow Boat. But sadly, there is no user manual with it. Any chance of a photo of the user manual you were sent?

  4. #74

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    Indeed

    Quote Originally Posted by hairydog View Post
    That's daft. Unless you monitor all the use, there is no point in doing it at all.
    The meter may be able to monitor slightly higher currents than it can display, but of course you can't run a 2KW inverter (max current around 200A) through a 30A meter. That's overloading by an order of magnitude.
    You need to buy a monitor that can monitor everything.
    Simple maths (ignoring inefficiency issues)

    2 KW at 220 V is say 10 amps @ 220V (yes I repeat)
    OK AT home a kettle may run at 3KW = 15 amps and not blow the 13 amp fuse
    ( 240V puts it on the limit 240V x 13 Amps = 3KW plus)

    12 V needs to be at 15amps x20 =300amps
    Burning leads !!!!

  5. #75

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    That's why I went for the BM2 so it could cope with our 3000w inverter..... And the 80 amps or so from the alternator when the batteries were down to just above 50%

  6. #76

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    Quote Originally Posted by hairydog View Post
    I just got home from a trip away to discover that the one of these I ordered has been delivered via the Slow Boat. But sadly, there is no user manual with it. Any chance of a photo of the user manual you were sent?
    If you PM me an address I will send you a PDF (I can't recall where I got it from on line so easier to send the file then search for the link)
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  7. #77

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    Quote Originally Posted by jagmanx View Post
    Simple maths (ignoring inefficiency issues)

    2 KW at 220 V is say 10 amps @ 220V (yes I repeat)
    OK AT home a kettle may run at 3KW = 15 amps and not blow the 13 amp fuse
    ( 240V puts it on the limit 240V x 13 Amps = 3KW plus)

    12 V needs to be at 15amps x20 =300amps
    Burning leads !!!!
    won't pull 300A for very long though with most battery setups


    FWIW, I am - or will be in around an hour now my ring terminals have arrived- running 70mm cable from my 2400W inverter
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  8. #78

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    Quote Originally Posted by jagmanx View Post
    Simple maths (ignoring inefficiency issues)

    2 KW at 220 V is say 10 amps @ 220V (yes I repeat)
    OK AT home a kettle may run at 3KW = 15 amps and not blow the 13 amp fuse
    ( 240V puts it on the limit 240V x 13 Amps = 3KW plus)

    12 V needs to be at 15amps x20 =300amps
    Burning leads !!!!
    2000 watts out will need about 2200 watts in. At that sort of current the voltage reaching the inverter will be around 11.4v. (2200 / 11.4) = 193A

    I don't believe the specs, though. Most 2K inverters won't deliver 2000 watts for very long. But then again, with only 300Ah of leisure batteries, you won't have very long.

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