It looks like

Panels: 28 * 650W = 18.2 kW nominal

Storage: 2 x 16 kWh LiFePO₄

Inverter: 1 x 16 kW hybrid single phase

1 x "Power Control Panel" (PCP)

We'd get a TOU meter as part of the installation.

Total estimate is THB 587,730 inc. VAT

The second battery might be overkill.

I tried to work out how much the parts would cost if I bought them myself and that came to THB 336,200 (excluding the PCP, presumably including VAT).

I suppose the difference of ~ THB 251K is the labour, services, insurance, 24/ 7 call out, etc. which is a premium of up to 74% over my estimate of THB 336,200 for parts.

The attached document (multi-page PNG!!) doesn't break the costs down. Perhaps because it's an estimate and not a quote. I added a Thai -> English translation and a table of parts costs I assembled.

I am not an expert, but the chosen components seem to be good quality.

I know enough about electrical stuff to not dare do it myself.

Does this seem to be a fair or even a good deal?

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These SOE’s (state owned enterprises) have to make lots of money to pay for all the generals and police chiefs that Prayut put on their boards of directors in his coup.

Just now, JBChiangRai said:

These SOE’s (state owned enterprises) have to make lots of money to pay for all the generals and police chiefs that Prayut put on their boards of directors in his coup.

Did you not understand the question?