Inverter Advice Please.

Discussion in 'Tech/Mech General' started by PhilandMena, Apr 29, 2015.

  1. PhilandMena

    PhilandMena Funster

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    I have just installed a Sterling 300W pure sine wave inverter in my motorhome and would welcome some advice on installation method.
    I have connected red and black cable directly to + & - terminal clips on one of my leisure batteries and all seems to be well. However, on my control panel leisure battery states 13.7 V yet digital display on inverter states 12.5. I don't get that as I'm on hook up on the drive.
    Also, on the back of the Inverter there is a wing nut for an earth cable. Is it essential I earth the inverter, this may be a problem as the leisure batteries are in a locker and I can't see any means of getting a cable to the Chassis.
    Thanks in Advance,
    Philip
     
  2. Reallyretired

    Reallyretired Funster

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    Most inverters are not earthed, indeed I'm not sure what you could earth it to in a vehicle as the vehicle chassis is not earthed, merely a ground return and just connected to the battery -ve.

    If you get two different voltage readings from the same battery then it looks like one of them is wrong, however if the inverter is displaying 12.5v with the inverter on and no load then it may be that your connecting wires are too thin or too long. If the inverter is on and under load then it would be expected that there would be a voltage drop.
     
  3. PhilandMena

    PhilandMena Funster

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    Thank you for that. The Inverter (Sterling) came with the wires already factory fitted, all I needed to do was to attache to battery. There is no load on the inverter so I'm at a bit of a loss. Instructions are nonexistent !
     
  4. Reallyretired

    Reallyretired Funster

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    In that case it looks like one of the voltmeters is reading wrongly, and if the battery is on charge on ehu then it looks like its the one on the inverter thats wrong.
     
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  5. PhilandMena

    PhilandMena Funster

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    I think your right! The leisure battery readout has always been spot on. Sargent systems on modern (2011) motorhome.
    I'll have a chat with the supplier tomorrow.
    Thanks for your input.
     
  6. peterc10

    peterc10 Funster

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    Phil

    The 13.7V is probably right if you are plugged into the mains. That is the normal trickle charge voltage from memory.

    I assume you and Mena are now safely home from your travels

    Peter
     
  7. PhilandMena

    PhilandMena Funster

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    Yes Peter and thanks, a great Journey.
     
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