hi all, Why not know more about some practical applications on solar energy e.g. solar water pumping system. As a valuable and perfect combination system, It should be popularized in
such as rural, remote and poor region. Do anyone have interests in this? Pls feel free to contact me if you have any brilliant ideas. I' m happy to set up a conversation with you.This is my mailbox- qiaohua.mai@gmail.com. Thanks!

To design a solar water pumping system is not so difficult. The advantage is that it doesn't need a battery for energy storage. The water storage does the job. For a simple solar water pumping system with a capacity of 1,500 liters per day it looks like this. The water will be pumped from a river. Therefor you build accumulation well in the river. You place a submersible pump in the well. Use two 80 W or one 160 Wp solar panel, a controller, x meters of Poly Drop Pipe to transport the water. Ready. I was able to buy this equipment in a solar energy shop in Addis Ababa 5 years ago. For more info or system design johann.flint@hotmail.com

I agree with Johann. It´s very easy design this kind of systems. And so many applications as Michael said.

Is the solar water pumping system to draw water from some places such as a river by using solar power. Don't we need to save the solar power? Are two 80W solar panels that Johann said enough to have a capacity of 1,500 liters per day regularly?

No, you don't need to save solar energy. You are using the solar energy available directly by driving the pump. The water storage is the place where you have saved the energy. Yes you can pump 1,500 l/d. I have selected the Phaesun Shurflo Submersible pump 9300 Well Pump 24V DC 4,1 A max head 70 m. flow 220 - 320 l/h depending on the head. I had a low head which results in more volume.

I'm so sorry i'don't know equipment very ewll. the head means the pumping machine?
Thank you for good info.

Head means the height in meters that the pump is able to pump. Friction losing in the transport tubes (pipes) are also converted into meters of head. In my case the total head for the pump was 30 m.

Yes, I got it. So the flow depends on the head. good! I want to try it.

It is a little bit more complicated. The relation between the flow (l/hrs) and head (m) is laid down in the pump characteristic. If you Google this word you will find examples. But very simple: the more head the less flow and visa versa

This discussion is really interesting for me.Since in the sub-continent irrigation projects widely use diesel and with the recent decline of panel price coupled with the rising cost of diesel,it is making more sense to go for solar pumping.Thank-you.

@Johann........What if in the case we can use the inverter with the solar system that you are talking about and deploy it in the existing system .......won't that help more in terms of output and reduction in the system cost......and also to design such system won't be difficult also.