How do you control fluctuating power in rural home?

Answer 1

To control fluctuating power in a rural home I'm assuming you mean the power or lights dim out when certain electrical appliances come on. This fluctuation or dimming of the lights will sometimes occur when a well water pump kicks on, or the home AC starts, usually any major appliance that has a large amperage draw, even a household refrigerator. Typically the dimming of the lights is caused by too small of wires feeding the main electrical panel to the home. I would recommend having a licensed electrician look at the electrical service coming into your home.

Hope this helps some.

Answer 2

You would need something called a voltage regulator. A voltage regulator is essentially a bank of capacitors. The mains is fed into the circuit, and the capacitors 'absorb' the spikes and troughs of the raw voltage. The power exits the device at a constant, stable voltage.