inverter, on or off overnight.

Discussion in 'Tech/Mech General' started by lou020, Sep 28, 2015.

  1. lou020

    lou020 Funster

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    one for you electrikery experts..

    while at lincoln, my 2x 110ah leisure batteries were flat,, 11v and lower both mornings. i had left the 2kw inverter switched on charging the mifi, and we had the led strip under the bathroom/bedroom door on, this strip has about 15 leds on it,the type which comes on a roll and you cut to length.

    would the inverter run down the batteries if left on,
    the batteries,,,,one is about 4 years old and the other maybe 18 months,,both numax.
    the motorhome is autotrail chieftain with the EC325 electrics.
    we had the genny running saturday night till 8.30 and still flat batteries sunday.
    haven't noticed before because usually we're on ehu.
     
  2. SteveandDenise

    SteveandDenise Funster

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    An inverter dose draw a current when on stand by but only a small amount I would disconnect both batteries fully charge them seperatley then test them with a known load
     
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  3. iandsm

    iandsm Funster

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    True the inverter will draw a very small amount if left switched on but not in use. It should not flatten your batteries overnight. But you were charging mifi, even that would probably not draw much once it has recharged. It sounds like your batteries are duds but it's worth a full charge test. I think if I were replacing batteries I would replace both at the same time with identical ones.
     
    Last edited: Sep 28, 2015
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  4. tonka

    tonka Funster Life Member

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    Agree on above.. Low current draw and the Mifi takes bugger all anyway.
    Suspect battery (s) kaput.
     
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  5. Glandwr

    Glandwr Funster

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  6. lou020

    lou020 Funster

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    i went out this morning to the van and the leisure battery was reading 12.6v. The fault is probably the youngest charging all his gizmos and gadgets while laid in bed,,,I'll get 2 new ones just in case from our supplier.
    Glandwr,, we have loads of those usb things, just need to start using them.
    thanks for the replies.
     
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  7. GJH

    GJH Funster Life Member

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    I agree with all the above comments but wonder why anyone uses an inverter to charge items like MiFi, phones, tablets &c. We use a 12v multi-socket adapter which includes lighter sockets and USB sockets and charge without the overhead of an inverter.

    The only thing we do use an inverter for is my camera battery which only came with a mains charger. I forgot to check before buying whether it could be charged in the camera as my previous one could. However, even that takes very little power.
     
  8. JockandRita

    JockandRita Funster Life Member

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    Our tablet and MiFi get charged (separately) via a permanently live USB port on our 1500w inverter, however we too use the twin port USB male plug (as shown above) from either of the 2 x dedicated 12v habitation sockets.

    Only the boss's hair dryer, slow cooker, Phillips Pod vacuum cleaner ;) and our FTA satellite receiver, are powered by an inverter. Almost everything else is 12v. (y)

    Cheers,

    Jock. :)
     
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  9. lou020

    lou020 Funster

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    I'm going to use the 12v sockets from now on, trouble with the autotrail is 1 socket is in the overcab and 1 rear bed above the garage. I don't like leaving things in them in case the the bedding interferes with the cable.
    I think the reason we charge through the inverter is because we use a anti surge plug adapter.

    I'll take a feed off the 12v supply to the inverter and fit some usb sockets under the seats.

    ps. just been out to the van and the leisure batteries are at 12.6v ,, with nothing switched on now for 2 nights,it has 1 x 100w solar panel working so that may have topped them up yesterday, although it's parked under a big tree.
     
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  10. ciderman

    ciderman Funster

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    the batteries should be reading at least 13.5v or more with the solar panel charging my twin batteries read anything up to 14v on the solar. if your batteries read less then I would say they are fecked
     
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  11. JockandRita

    JockandRita Funster Life Member

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    Lou, disconnect the solar supply to the batteries now, and check the voltage again tomorrow morning. I think you'll be in for a shock. I reckon the solar charge is the only reason your batteries are reading 12.6v A fully charged system should read a minimum of 12.7v. Are you using a digital volt meter for your readings, which is more accurate than an analogue meter reading?

    Good luck with solving the problem with 2 x new batteries. (y)

    Cheers,

    Jock. :)
     
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  12. lou020

    lou020 Funster

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    Jock,, I was reading from the onboard sargent panel. I'll disconnect the solar and check it with a digital meter on Thursday morning.
    Is there a way of testing each battery with a multi meter. I have the the old fashioned big pronged drop tester.
     
  13. PhilandMena

    PhilandMena Funster

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    Agree with others that your Leisure batteries may have had it. However, do a drop test to make sure.
    If your going to replace them strongly advise you get the Banner leisure batteries as they are the dogs Bollocks.
     
  14. TheCaller

    TheCaller Funster

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    Yes, but 12 hrs overnight shouldn't flatten 2 x 110Wh batteries if it wasn't doing anything other than charging a mifi. A 2k inverter will have a significant quiescent current draw though. If you post the make & model number we can probably tell you how much.

    Unless you are setup with a mobile power station like Techno100 or eddievanbitz, turn the inverter off when not in use & as far as possible, only use it for things where there is no 12v alternative. They are an inefficient way of operating anything that could be run directly from the 12v supply.

    What else do you use the inverter for? 2k is quite a beast & will be very inefficient when operating devices that only need a few hundred watts. If you don't need that capacity, it might pay to sell it & buy a smaller one. I would look for a 50% margin, so if the biggest device you ever use is 400w, a 600w inverter would be ideal.

    Like everyone else, I suspect your batteries are past their best.
     
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  15. lou020

    lou020 Funster

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    The inverter is a silverline, i had it given by one of our drivers and has worked brilliant for the last 4 years.
    we use it for a small table top freezer while travelling if we are going somewhere hot, as the onboard freezer is useless in hot weather. we also use it for a microwave which it operates well.
    iv'e disconnected the solar now,and will check on thursday what the batteries have dropped to.
     
  16. Speve

    Speve Funster

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    I notice your leisure batteries are quite a bit different in age that can cause a problem in itself as the older battery may bring down the newer one thus you are not keeping the correct charge so they will be lower than you may think.
     
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  17. TheCaller

    TheCaller Funster

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    Is this the one? If so, it should draw less than 1A when switched on but doing nothing. So decent batteries shouldn't be too bothered about it being left on overnight, although you wouldn't want to make a habit of it.

    It's a modified sine wave output, so you are doing well if it runs the microwave ok. Not all microwaves are very happy on modified sine wave inverters.
     
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  18. lou020

    lou020 Funster

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    That's the one,,except mine has one socket.. it does make the microwave sing a little, and i usually start the engine.
    the microwave is a cheap one from morrisons, that is 5 years old now.
     
  19. pappajohn

    pappajohn Funster Life Member

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    Not the best quality....by a long way.

    I would estimate standby current (turned on but doing nothing) would be 1 to 2 amps.

    As already said, use it when you MUST not just for convenience.
     
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  20. JockandRita

    JockandRita Funster Life Member

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    Not so much testing with a digital meter Lou, but more of getting an accurate voltage reading.
    We have 2 xx old fashion FLA traction batteries, whereupon I can remove the caps and check the electrolyte in each cell with a hydrometer. In the absence of a battery tester, this is the next best indication of cell condition and capacity. Obviously no good for sealed FLA, or Gel batteries.

    Cheers,

    Jock. :)
     
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