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Roger
Perhaps an inverter running a recycled PC power supply. Pc supplies usually have 5 And 12 volts. 300w inverter about $70 from Aldi stores and PC supply from next council clean up day or recycling center. The inverter has the advantage that it can be used to charge other things (laptop, phone,camera batteries etc) without buying special 12v chargers. Disadvantage is loss of effiency swapping voltages backwards and forwards.
Graeme
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