Watts = Voltage x Current x Power Factor
1000 Watts = 1 Kilowatt
Therefore, you need to know current and Power Factor to answer your question.
45 volts
1000
230 Volts
about .09-.10
1.55 volts
0.016 volt
Zero volts.
4160 volts
230 volts
BTU x 0.000293 = kW-h
neither...it should have 14.63 volts
3 Kv = 3,000 volts.