Fruit Trader

Yes it will from AC peak voltage and diode magic. I found a video from tinkerer Big Clive that kind of demonstrates the idea using both sides of the AC cycle.

The current would be in the microamp range if a LED was used as a mains tester. Consider the following :- A much safer method for test screwdrivers is to drive a LED with a battery and detect mains voltage with a sensitive transistor circuit.

The answer might be in the difference between vented and unvented tankless heaters explained by @Crossy in the thread below.

The recent Wiki article has detail about Taleb al Abdulmohsen past in the suspect paragraphs. https://en.wikipedia.org/wiki/2024_Magdeburg_car_attack

Family in Chanthaburi use high pressure spray pumps which is where I picked up the info. The oil you show should be fine for your pump.

The 4T oil is for the 4 stroke engine. If the automatic transmission fluid is for the pump then it is incorrect. Use SAE40 pump oil. The piston lubrication cups require grease.

If you provide the pump with enough direct solar panel power the pump should run but its a terrible method. Solar well pumps operate best when there is a power point tracking controller in between pump and panels. The video below might explain why you are having problems with your pump directly connected to a solar panel.

Thailand has many written standards that are rarely followed. Example TIS 11-2553

On that note, its would be a good idea for the OP to check all existing surge devices have the essential solid ground connection.

Here is link to Thai 3M Filtrete website showing split air products. https://filtrete.3m.co.th/3M/th_TH/filtrete-th/products/air-conditioner-cleaning-filter

Not my pump, best to aim concerns about pump size at @djayz

Below is detail for generic Chinese solar pump controllers with 1500W highlighted. I would go on the high side of recommended solar power of ≥ 1.3*Pump power

Insisting they install a ground wire was a wise move but its likely the surge that wiped out your AC was too large for its protection to capture. As mentioned by @Crossy, surge protection at the CU adds another layer capable of handling larger surge currents. Local isolation at each AC is another method to reduce risk. This allows two pole disconnection from the power line when AC is not in use for long periods.