How many solar panel does it take to run a 1 hp electricity motor rough cost for the panel.?

You should be able to generate 750-1,000 Watts with about 50 to 100 square feet of panels. Cost will be $10,000 to $12,000 but the cost may be offset some by tax incentives. This will run your motor when the sun is high in the sky and shining brightly (no clouds).
That depends on the size, efficiency, and location of the cells. Basically, 746 W = 1 HP. It doesn't matter how you get the watts.
All Electric Motors have a start up surge. It is normally 3 to 7 times what it takes to run the motor. So a battery bank is required to start the motor. A charge controller is required to charge the batteries correctly.

As said above and depending on the motor if it takes 746w to run the motor you will need an inverter that would be be able to surge to 5000 watts worse case. Most inverters only surge about double what they are rated at so a 2,500 or 3,000 watt inverter would be required. Inverters are only about 90 to 93% efficient.

The norm for solar modules is to out put about 80% of what they are rated because of heat and wire and voltage loss. Then going through the charge controller you would loose about 10% more. Remember there is a battery charging loss as well.

Anyway, you would have to have about 970 watts to 1000 watts in panels just to keep the motor running with out putting back the power you pulled from the battery bank to start the motor.

Sounds like you better get a 1.5 kWh system with a 3000 watt inverter.

You can guess about $9.21to $9.50 per watt for all the parts. The system has to be grid tied to get any tax breaks. So you are talking roughly about $14,000.

And that is rough because there is no way to know without a lot more information.
Maybe add a few cells to the other answers,because while 746 watts =1 hp, a 1 hp motor is not 100 percent efficient, and will require more then 746 watts of power in order to produce 746 watts of work.
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