How to Convert Conventional Powered Motor/Pump with a Solar Powered One?

What is the cost of not doing it?

You will need a full setup to do this, including the solar panels, battery bank, and inverter. If cost is a major factor, you probably are not going to be able to do this conversion. The payback time to switch from grid power to solar is going to be many years! A 1.5KW system is probably going to cost from $15,000-$20,000 (very rough estimates, I am not involved with the solar industry). Remember, if it was cheap/easy, everyone would be doing this already.

Tom D.

Besides what has already been said, it is not as simple as just providing a 1.5kW system. The motor must be started, and starting power needs a much larger PV inverter than just the operating power because there is no reserve starting capacity as there is with rotating generators. So to start a 1.5kW pump motor DOL with a PV inverter, you may need 9kW of PV power.

One way around this is to use a "Variable Frequency Drive" to power the pump. But a solar PV inverter that then powers another inverter in the form of a VFD is wasteful and expensive, just so that you can use your existing pump.

For that reason, it's usually less expensive to start from scratch with a PV powered DC pump system that takes all of this into consideration. But of course by having to buy the pump again you are extending the ROI point out even further. In most cases, the payback on something like this exceeds the expected life of the equipment.

You already run these pumps on your house network so the easiest is to get a grid tie system as big as you can afford and let the pumps as they are. Grid tie systems are roughly half the price of an out of grid system.

In a solar swimming pool i don't think you have to convert solar energy into electric and then use a heater to heat water.

Direct solar energy is absorbed by black painted metal plates in closed glass box filled with fixed amount of water at a time to allow natural circulation.

"I want to convert my existing swimming pool pumps (1.5 KW, 220-240 V, 50 Hz) into Solar powered pumps."

Oh it was about pump.