Charging a battery with itself?

chriselks
chriselks Registered Users Posts: 13 ✭✭
in Off Grid Solar & Battery Systems #1
Is it possible to charge a battery bank with itself I have a charger that will run off my inverter the input is 120v 1amp and the output is 12v 20amp is it possible?
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  • petertearai
    petertearai Solar Expert Posts: 471 ✭✭✭✭
    #2
    yes ... but futile exercise . you will go backwards. 
    2225 wattts pv . Outback 2kw  fxr pure sine inverter . fm80 charge controller . Mate 3. victron battery monitor . 24 volts  in 2 volt Shoto lead carbon extreme batterys. off grid  holiday home 
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  • cow_rancher
    cow_rancher Solar Expert Posts: 117 ✭✭✭✭
    #3
    It's called a perpetual motion machine.
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  • Estragon
    Estragon Registered Users Posts: 4,496 ✭✭✭✭✭
    #4
    No, it is not possible to create 240w in 12Vdc charging from 120w 120vac inverter power. One or both current measurements are wrong. Inverter, charger, and wire losses mean charging watts will always be less than inverter input wattage.
    Off-grid.  
    Main daytime system ~4kw panels into 2xMNClassic150 370ah 48v bank 2xOutback 3548 inverter 120v + 240v autotransformer
    Night system ~1kw panels into 1xMNClassic150 700ah 12v bank morningstar 300w inverter
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