A person wants to buy my juicer, but has only solar power, says it’s DC. I’m so out of my league here I don’t even know what I need to know from him in order to find out the answer!
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2 different approaches:
1} he buys an inverter which converts DC to AC at mains voltage. He can use the solar cells to charge a battery and run the inverter off the battery. That way he can run any domestic power appliances off the inverter. [beware if he has a 300W inverter he can only use 300W worth of power at any one time.
This is the most convenient method.
2] He can supply DC direct to DC devices, but most devices have different voltages and those that plug into the mains usually need AC. Lots of messing around and you need to know what you are doing with this approach, but it is slightly more efficient.
Juicer will almost certainly need AC.