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Thread: Electric Charge Machine

  1. #1
    New Member
    Join Date
    Sep 2015
    Vic Falls
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    Electric Charge Machine

    Good Day

    I recently purchased an electric charge machine/invertor to charge and use a battery to counter load shedding. Please advise which size of a solar battery can i buy that i can use on 70 watts TV and 2 x 4.5 Watts electrical bulb. I expect at least 5 hrs of battery use.

  2. #2
    Silver Member
    Join Date
    Jun 2017
    Port Elizabeth
    Thanked 87 Times in 71 Posts
    Without knowing input voltages of your inverter your most important factor when choosing a battery is Depth of Discharge (DOD) cycles .

    Most solar VRLA batteries sit around a comfortable 20% DOD - Lithium batteries around 80%

    With your requirements listed you are wanting 400 VA ,excluding the losses of the inverter which vary according to the make and size, of battery usage during the 5 hours -

    A 100VA VRLA battery would be borderline and sit at around 33% of DOD excluding the inverter losses - I would use at least 200VA

    Ask the supplier to give you the DOD graph to see what would work best on the batteries they are supplying

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