stepway Hello, It could to be over voltage protection beep. Are you sure have you bought 24V type ? It has not automatic input detection and switching. You can try to connect it to only one 12V battery .

stepway It is the light weight metal.

stepway The tap itself could have max 400 g weight, plus electromagnetic valve ~max 300 g. I can't answer exactly because it is already installed and working about 1 year on my kitchen sink. Tap tube is made from light metals alloy and so overall weight is very small.

stepway There is rectifier well shown on board photo. No doubts Amp require AC power

stepway Seems so, because because faucet tube is insulated from base by rubber gasket and therefore faucet can't be antenna for sensor, which is electricaly connected to base only

stepway You can use it connected only to cold water pipe, but You need to think about how to block the hot water outlet from the tap. In another case from this hose will start to flow flow cold water as soon you will open tap.You can try to screw out the hot water tube and put into hole suitable metal screw as as a plug, or find in nearest plumbing store cap that can be screwed onto hot water hose. The third option is to connect both hoses to cold water line. But do not buy that product and try to find out similar for cold water only if you aren't familar with plumbing works, because even small mistake in DIY works can raise later an sad water leakage problem in your house.

stepway Hello, I had the same problem after soldering. I am pretty sure I was not overheated any components or there was an soldering shorting. I even washed board after solering with soldering flush remover. When all these things did not help I took in help oscilloscope and found 32768 KHz oscillator is defective - there was not oscillations on Clock chip pins 2 and 3. I cutted out defective oscillator from board. Spare part i found in one old unused alarm clock. 32768 KHz oscillator is standard in the most of electronics or electro-mechanical clocks in the world. I carefully soldered it into the DIY board and aleluya - My clock is alive now.