What size inverter do I need?

Discussion in 'Bikes and eBikes' started by ultima, Jul 9, 2016.

  1. ultima

    ultima Funster

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    Have an E- Bike (Pro-user Wayfarer) and would like to charge off grid(12v) what size inverter do I need as I am not very well up on them?
     
  2. hilldweller

    hilldweller Funster Life Member

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    Almost certainly a 300W pure sign wave is a decent all round size, works for me for bikes, laptop etc. About £60 from UK or £40 from China.

    You may get away with smaller and cheaper if you want minimum spend.

    PS.....

    Look at the charger, it should be labelled something like 240V 100W, it's that 100W that is the minimum size.
     
    Last edited: Jul 9, 2016
  3. mitzimad

    mitzimad Funster

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    Depends on the size of the charger and how much battery capacity you have
     
  4. pappajohn

    pappajohn Funster Life Member

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    If the bike charger is labelled as 120watts (makes the maths easier) it will draw 10amps/hr from your battery.
    Add in a little for conversion losses so maybe 11amps/hour.
    A 5 hour charge will flatten (50% discharge) a 110ah battery.
    Obviously using an inverter you are not on hook up and somehow you need to get that 55 amps back into the battery quickly.
    Solar panels are unlikely to do that unless they are many or very large.
     
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  5. rosalan

    rosalan Funster

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    I have a 300w non-pure sine wave inverter, which charges our two e-bikes (AS Bikes) without any problems so far but beware, it blew up my electric toothbrush; really!
     
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