tlfong01 wrote: ↑Mon Oct 15, 2018 3:34 amWell, I very much agree with you on point 1.
But for point 2. I am not very sure.
Rpi/Esp8266 controlled DC12V Dry/Wet Water Pump for the Rooftop Garden Fish Tank
Whether grounding the fish water tank is a good or a bad idea, I think it is unfair to the fish to live near a AC200V water pump.
Looking back, I must confess that I did not think thoroughly before buying the 220VAC water pump. I did not realize that the water pump must be submerged in water to operate. In other words, it cannot dry run.
So I decided to buy another water pump. This time from TaoBao, a 140 yuan, high class, medical use, 12VDC brushless DC motor with adjustable speed.
https://item.taobao.com/item.htm?_u=f3t ... 6993226670
It is similar to the Aliexpress pump below:
AliExpress DC 12V Solar Hot Water Circulation Pump Brushless Motor Water Pump 3M
https://www.aliexpress.com/item/New-DC- ... 6bfc9e89fd
the pump is perfect for the family home thermal solar systems or any circulation pump application where conventional power is not available.
Horizontal inlet and outlet with rotatable cap, easy installation. Max operating temperature up to 100°C with External circulating water flow.
Super long working life.low consumption & low noise. Amphibious design.Submersible installation and entirely waterproof.
DC 12V Hot/Cooling Water Circulation pump
Inlet/Outlet: 1/2" male thead
Voltage: 12V DC
Maximum Rated Current: 500MA
Max Flow Rate: 6.5 L/Min
Max Water Head: 3 metre
Max system pressure: 10Bar
Max circulating water temperature: 100°C
Low noise: 30db at 1 metre