Muhendis

Another thought about the panel arrangement. Although the total power capability is over 20 kW you will never get that much with panels pointing in different directions. Also the max. power from three 5kw inverters in parallel could be 15 kW but only if all inputs are at good power.

Note there is only 1 MPPT input per inverter so paralleling needs to be done with a combiner. BUT The East and West arrays could produce 7.82kw each which is above the spec. of 6kw per inverter.

Yes. As the temperature of the panels goes down their output goes up and conversely as the day goes at the time of most output the panels will be hotter and give less output. If you derate the output by 10% you will be on the conservative side of about right (this loss can be as much as 20%). The panels are characterised at 25ºC and with a 1kw sunlight simulator.

You are planning on having 4 inverters but only three PV sources. I can't think how you are going to achieve connecting three into four. If this is done by splitting each of the PV arrays into the right number of strings for each inverter then are you sure you won't be overloading the PV input maximum power? What are the input limits of the inverters?

That is true up to a point. Trouble is it doesn't take into account the loss of power from the sun in the winter when it is lower in the sky. In these circumstances the light has a bit more atmosphere to get through and is attenuated before it reaches the solar panels. To compensate for this the angle of 15º is changed by 2º to 17º thus giving better power when the sun shine is weaker.

What else could he say?

That would be about 7.8W loss for a 20M length of wire which I would guess is negligible using 2.5mm². 320V is high but I guess that's the trend. What is your MPPT range?

That depends on the length of the cable and the maximum current it's required to carry. My installation for example, generally runs at about 120v but the current from each of the two strings could be as much as 30A. My cable length is under 10M (20M there and back-again) but I use 16mm² from the combiner boxes to the charge controllers. That is probably an overkill since at 30A the losses would be about 22W If I were to use 2.5mm² the losses would be about 144W which although not alarming, is considerably higher than I would be comfortable with.

These self checkout machines are everywhere. I am finding them in airports where you can que jump by using one to get a boarding pass. All the more normal people seem to prefer the chumminess of the que. As an after thought. By using a machine the company saves money so one day they will pass on the savings to the customer?

There is no such thing as "excess generated power". The sun shines whether you make use of it or not. Just because you are not using the available electricity it produces is not a problem. The fact is, it is there if you need/want it. Imagine the situation where you have available 5kw of solar power but you have a sudden unplanned requirement for 6kw. You need to have that extra 1kw sitting there for that sudden requirement. So you need to have available as much power as you think you will need +20% for the extras you forgot in your calcs. and for future expansion. The "excess generated power" does not do any harm but just sits there enjoying the sun shine waiting for the time it's needed. In detail. With no current being taken (I=0Amps) the panel voltage (E) will go to its maximum possible and no higher (Voc) so from W=EI power (W) is zero. As current is drawn so the panel voltage will reduce. When the maximum current is reached (Imax) the power will be the sum of the current flow and the voltage of the panel at that point. In a manner of speaking, if there is no current flow then there is no power to be referred to as excess.

So what would be the result if all transportation became electric. 66% of oil is refined into petrol and diesel. Something like 4% is made into plastics like the insulation of electric cables and solar panels. The rest is split between asphalt soap/detergents ect. and loads of other products. My guess is that if no more petrol and diesel were produced, the cost of plastics and the rest would see a substantial increase. This is an interesting read over a decent cold beer, or an indecent one for that matter. https://energyeducation.ca/encyclopedia/In_a_barrel_of_oil

Things like that only happen if a complaint is made to the police. The question of why no complaint was made would have a few interesting answers methinks.

I can easily remember all but two on the OP list. I also remember this

A what!? 'Tis a chip butty. Never could see the sense of it but many loved 'em.

If this is indeed what has happened then it would be very difficult to recover a submersible pump. It rarely happens but when it does you can say good by to your 21,000 baht pump.

I am curious to know how far down is the top of your water in the bore hole? Mine is a 51 metre depth with water always 3 metres from the top.

why is t.d.s, in capitals, Deleted?

Sounds about right. I use a surface water well almost exclusively. My bore hole water is way too hard so only used for emergency. My filter arrangement is 2x four foot sediment filters followed by a resin filter. Then I have a 20" 5 micron and a 20" 1 micron poly something filter. Water is then good enough for general house use. Drinking water is from an RO unit which makes the water germ free. Sediment and resin filters are backwashed every 3-4 months (or when I remember) and resin is rejuvenated at the same time. I use a <deleted> (total dissolved solids) meter to check water condition. The <deleted> meter is not expensive and is readily available on line.

Borehole pump choices are: 1) Jet pump 2) Submersible pump. The jet pump is a lot less costly and works fine. I use a 370 Watt Mitsubishi jet pump which is more than adequate.

Do you know how deep your bore hole is? Sand and sediment don't normally come from a deep bore hole. Of course it could be that your bore hole is not lined. Normally the top (up to) twelve metres or so would have a 6" blue pipe liner inside to stop soil etc. from falling into the water from the top and side walls. If you don't have this then I'm sure an enterprising builder would help you install one. Pumps don't normally come equipped with their own filters but you can get some nice carbon filled filters which will remove sediment enough for clean household water. These are the "go to" people for water treatment etc. https://www.duan-daw.com/category/16/ถังกรองน้ำ-สารกรองน้ำ

I had to read that headline twice. In my mind was a very rude idea. Sympathies to the family of the worker who lost his life.

Plus free drinks for the village. I'll be round for mine later

Burn 'em out. https://lineagetreecare.com/tree-service/how-to-burn-out-a-stump/

Just like at a buffet.

Looking at the results of the lab. report I would say high levels of precision are not so important. Any contaminants which have been picked up from sources other than the bore hole are listed in with the bore hole water. It does not matter if they are from the hole or minimally from the surrounding environment, the water is safe but a bit hard.