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Solar Production Isaan

Featured Replies

Anyone done the deed, or is it something nobody cares about ?

For registering solar power with the

Provincial Electricity Authority (PEA)in Thailand, the registration and inspection fees generally range from2,000 to 2,140 THB. This administrative cost is separate from the actual hardware and installation expenses. 

What was the total price for the process done by an engineer?

I haven't officially registered at office, although when they came to replace the temp meter, with a permanent one, installer did ask if I had solar. Which I confirmed having. Guess he notice the minimal use since temp meter was installed.

Didn't matter, as we were getting a new digital meter anyway, and all new meters are in our area. This was a new house build. They never came out to ask about or inspect the installation of.

If he had not asked, I wouldn't have offered the info.

  • Author
10 minutes ago, KhunLA said:

I haven't officially registered at office, although when they came to replace the temp meter, with a permanent one, installer did ask if I had solar. Which I confirmed having. Guess he notice the minimal use since temp meter was installed.

Didn't matter, as we were getting a new digital meter anyway, and all new meters are in our area. This was a new house build. They never came out to ask about or inspect the installation of.

If he had not asked, I wouldn't have offered the info.

I choose to register now than later, since I got the engineer at location and all documentation handy, because Im sure one day, it will be obligated to do so. And if I can sell back electric to the grid later, why not ?

2 minutes ago, Hummin said:

I choose to register now than later, since I got the engineer at location and all documentation handy, because Im sure one day, it will be obligated to do so. And if I can sell back electric to the grid later, why not ?

I'll only register then. On good day, we have 15-25kWh extra.

A read out before we got the digital meter ...

image.png

  • Author
4 minutes ago, KhunLA said:

I'll only register then. On good day, we have 15-25kWh extra.

A read out before we got the digital meter ...

image.png

I measured my 24 hours peak use a few days ago, and used 29kw total. And we got maybe 50-70kw production on good days.

How much do you normally produce on cloudy days? If it rains here on day time, it rains max 30 min to an hour if ever an hour on daytime.

2 hours ago, Hummin said:

I measured my 24 hours peak use a few days ago, and used 29kw total. And we got maybe 50-70kw production on good days.

How much do you normally produce on cloudy days? If it rains here on day time, it rains max 30 min to an hour if ever an hour on daytime.

On some overcast and or rainy days, we barely got back to 100% on the batteries before sunset. We only use about 6kWh overnight during rainy season, and minimal AC, if that overcast & rainy, during day time.

Here's probably one of the worst production days, with minimal use. When it bounces up & down like this graph, you know the sun was barely making an appearance. Still charging batteries up to 1800 hrs. On sunny day, batteries usually topped up by 1000 hrs., bottom photo

Only produced 12.4kWh, and almost 8 of those going to the batteries, using 4.5kWh for the house.

image.png

image.png

  • Author
  • Popular Post

Now up and running.

It is a bli cloudy today, but production is very good, and I haven´t even started the aircondition yet.

Last evening and night we used the whole package of electric before we started to produce. Did run my 30 000btu until 20:00 last night, and later two 12 500 btu all night to the morning. So I wish I had another battery, but its okay to use little bit from the grid when needed instead of investing another 100k or so for 10kw more battery capacity.

My problem is, I wrongly got a non inverter aircon instead of inverter. That beast consume alot more than it produces. So mistake nr one was not to push through a return when they sold me wrong unit.

IMG_0663.png

IMG_0664.png

Peak of each string production this morning.

IMG_0665.png

IMG_0666.png

You can not have battery storage if you want to sell power to P.E.A

  • Author

Now everything assembled and running for 2. Day

Batteries lasted all night with two airconditions running all night and also a few 3 hours with the 30k BTU in the evening.

Batteries started to charge 7 and finit 10. 3 hours for 14,7kw. Could fine had two more 10kw batteries, but again, is it worth it ? 200k baht ? How many years to downpay versus paying a few baht every month for overconsumption ? I do not think so.

I also run the aircon in the gym to cool down the batteries a 19 500btu non inverter also.

att.EidMU3nT-ay7ODORvXuRn6O73IsC_-pCEmE3rTEsFVQ.jpeg

  • 2 weeks later...
  • Author

Everything rolling good, been off grid since installation.

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On 3/2/2026 at 2:58 PM, Hummin said:

Batteries started to charge 7 and finit 10. 3 hours for 14,7kw. Could fine had two more 10kw batteries, ... but again, is it worth it ? 200k baht ? ... How many years to downpay versus paying a few baht every month for overconsumption ? I do not think so

Nah, not worth it ... IMHO

We found out when one ESS crapped out, we really didn't need the 2nd, and 10kWh vs 20kWh is all we needed. Rarely used the grid overnight, and only a kWh or 2, used, with ESS set @ 30% to use grid.

It would take years to realize any ROI, of the 2nd ESS, alone. With just the one, we're almost at ROI already, and less than 4 yrs. Of course the BEV make that possible, or it would be a few more year for ROI.

Longevity wise, would think ESS would be lower in cost in the future, so not the best idea to have too much now. Though definitely appreciate the redundancy of have 2 ESS. For some, even having one ESS may not be the best ROI, depending on overnight use, unless really prone to outages, which we are not.

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