how many solar panels and whatelse do I need to power a 1hp, 0.75kw electric motor?

Question

the motor would be used to pump water from a well to an over head tank about 12 feet high.

Answer 1

Quite a lot....!
The largest commercially available solar panels in a "manageable" size deliver 200 Watts each, and are 65" X 40" large, and cost about $1000.-- each.
For a 0.75kW motor, you would then need at least 4 of those panels.
But that's not how it works in reality, because -
- a) Your pump most likely will only run for short periods, and not continuously,
- b) When the pump starts, it will need (for a very short time) much more than 0.75kW to start-up,
- c) The whole thing wouldn't work at night,
- d) The solar panels deliver a low DC voltage, while your pump (most likely) is for 110 or 220 Volt AC.
So what you need is -
- 1) A bank of deep-cycle batteries that deliver the high power requirement for a relatively short time (= starting & running the pump), and to bridge the night time,
- 2) A solar panel to charge those batteries,
- 3) A charge controller electronics that manages the correct charge to the batteries,
- 4) A power inverter that changes the low DC voltage from the batteries to high DC voltage for the pump.
To give you more detail (what / how many batteries, what solar panel, what inverter) we don't need to know about your water tank, but -
i) How often and for how long do you think the pump will come on?
ii) What is the supply voltage for the pump?
iii) On which latitude do you live?

Answer 2

First of all, 1 hp is way too big a pump for domestic or stock tank purpose. half horse submersible is fairly standard but get smaller if you can. the reason for the bigger sizes is to pressurize pipes, which you don't need. Domestic or stock tank is typically 200 gallons per day. A 0.5 hp 8 stage submersible pump that fits inside a 4 inch casing pipe will lift 15 gpm 60 feet (48 ft drawdown, 12 ft surface height.). It will provide a days worth of water in 13 minutes and consume 86 watt-hour of power. This can be powered by a 500 watt inverter connected to a 100 amp hour battery. The battery itself delivers 1200 watt-hour, or is good for 14 days without a recharge. The solar panel can provide the recharge, a 20 watt is a reasonable standard size. it needs 4.5 hours of good sunshine per day to keep up with the pump.

i live in Wyoming and use REA power for my pumps. In this region, wind is still used for stock tanks, but solar is gaining in favor as the sun is more reliable.

Answer 3

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Answer 4

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