Fruit Trader

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.

Lightning is a varying electric current and does exactly what we expect from varying electric currents, it produces EM waves. These waves can be detected many kilometres from the source. Inverter type air conditioners that are not correctly grounded will be more susceptible to damage from spikes on the supply line. Its quite common for Thai installers to not ground outdoor units which later gets picked up during warranty claims.

Apparently, Tommy Robinson has become a best selling author. https://www.amazon.co.uk/Manifesto-Tommy-Robinsons

For those living in and around Pattaya, a claim that yellow books are sometimes useless might carry a little weight. I agree with the usefulness of a yellow book but it must be quite disappointing for someone who went through the application process only to find their local DLT does not accept yellow books as proof of residence. I know of two fairly recent cases where the yellow book was not accepted when renewing a driving licence at Chon Buri DLT. Reason given by this office for rejecting yellow books is that people move address without updating the yellow book whereas in most cases immigration carries up to date address information. For those who wish to question this, a call to the Pattaya Chon Buri office will provide the latest ruling on yellow books and pink cards.

For an official Jinko panel distributer where you can pay then collect and inspect the goods :- JTN ENERGY CO LTD

Is a little over priced considering brackets power supply and trunking are already installed. Removal of the old AC is easy, gas recovery into the outdoor unit takes leas than a minute. Note. As scrap, a fully copper AC will place up to 1600-1800 Baht in your installers pocket, aluminium about 700-900 Baht. The best way to test your AC's in the same room is let each come up to set point then monitor cost to hold temperature over time. Important to measure room temperature with separate device because accuracy of AC's setting varies between brand.

Agree.

Me.