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.

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 ...

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 ...

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.

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.

Peak of each string production this morning.

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

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.

Everything rolling good, been off grid since installation.

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.

Cant complain about the effect at sunrise at all. 510kwh produced so far this year. The batteries was full at 09:30 yesterday. Can only hope they open for export at once we are registered at the PTA office.

4 hours ago, Hummin said:

Can only hope they open for export at once we are registered at the PTA office.

Since you have your plant setup by an installer who also did the PEA registration for you then he should also have informed you that PEA don't buy back power from plants that have battery storage.

21 minutes ago, lom said:

Since you have your plant setup by an installer who also did the PEA registration for you then he should also have informed you that PEA don't buy back power from plants that have battery storage.

No worries, read hope, where I have no false illusion about exporting my excess possible production this decade. Might be in future. We will see.

Yeah, the PEA rules are a little more nuanced than simply "no export from systems with batteries".

Generally it boils down to not being permitted to export energy from batteries to grid, provided any export is coming from the solar directly then batteries do not enter the equation.

I asked my favourite AI system (which it admits can be wrong), here is our conversation as a .pdf. we can't upload .pdf files so this is a link to my OneDrive.

https://1drv.ms/b/c/22162f5b8872d05b/IQD4li_YzurzRIgRAD3WVMtkAbjXtJ059g4cO29QsgEpFhk?e=1wHdGI

It should be viewable by anyone, please let me know if it won't open for you.

I have kept an eye on the battery cell temperatures and have added aircondition during the highest loads, and managed to keep the average temperature on battery 1 which is in the middle of the stack below 40c. If I do not, it reaches 42c at the max as the temperature are now.

Yesterday I «toggled» the load to be max 4kwh, and I see a different trend today. Anyone else paying attention to the battery temperatures to keep the battery lifespan?

I know my sigenenergy have built in toggling, and have all measures for good performance in tropical environments, but I got some time to follow up my system, so ?

Our packs rarely get much above ambient and they are in a non-A/C space.

We do treat them very gently mind, rarely going over 0.1C maybe 0.2C charging on a really sunny day.

Currently everything is about 31C with 30C on the weather station.

30 minutes ago, Hummin said:

I have kept an eye on the battery cell temperatures and have added aircondition during the highest loads, and managed to keep the average temperature on battery 1 which is in the middle of the stack below 40c. If I do not, it reaches 42c at the max as the temperature are now.

Yesterday I «toggled» the load to be max 4kwh, and I see a different trend today. Anyone else paying attention to the battery temperatures to keep the battery lifespan?

Yeah, my batteries hang at around 30c in the kitchen, windows open.

On 3/15/2026 at 12:40 PM, Crossy said:

Yeah, the PEA rules are a little more nuanced than simply "no export from systems with batteries".

Generally it boils down to not being permitted to export energy from batteries to grid, provided any export is coming from the solar directly then batteries do not enter the equation.

I asked my favourite AI system (which it admits can be wrong), here is our conversation as a .pdf. we can't upload .pdf files so this is a link to my OneDrive.

https://1drv.ms/b/c/22162f5b8872d05b/IQD4li_YzurzRIgRAD3WVMtkAbjXtJ059g4cO29QsgEpFhk?e=1wHdGI

It should be viewable by anyone, please let me know if it won't open for you.

I think todays energy situation can speed up the process with approved systems within specs of PEA. For most households, selling stored energy from batteries, is not especially lucrative because of battery prices.

1 minute ago, BritManToo said:

Yeah, my batteries hang at around 30c in the kitchen, windows open.

The core cell temperature during load? How is that possible ?

54 minutes ago, Hummin said:

The core cell temperature during load? How is that possible ?

It doesn't get much loading.

My biggest appliance is about 1.5Kw.

1 hour ago, Hummin said:

The core cell temperature during load? How is that possible ?

47 minutes ago, BritManToo said:

It doesn't get much loading.

My biggest appliance is about 1.5Kw.

2 ACs ( set on 25°C), 2 Air Purifiers on 'high fan' settings, 55" TV, 2 Laptops, 2 fridges, indoor temp 26°C, outside temp 30°C.

ESS (2 X 10kWh) located indoors in AC comfort.

14 minutes ago, KhunLA said:

2 ACs ( set on 25°C), 2 Air Purifiers on 'high fan' settings, 55" TV, 2 Laptops, 2 fridges, indoor temp 26°C, outside temp 30°C.

ESS (2 X 10kWh) located indoors in AC comfort.

Your battery load is 4 + kwh? However outside temperatur of my batteries is room temperature, but the core cell temp while it is loading is going up above 40 if I do not regulate load. At times I have over 7kwh load, while I restricted my load now to be only 4kwh to not overheat the batteries which will degenerate the lifespan of the batteries over years.

SigenEnergy info

SigenStor batteries are designed to toggle off (shutdown or restrict power) to protect the system when internal cell temperatures exceed safe operating limits, typically starting to restrict power around

40°C (104°F) and reaching a maximum operational limit of 55°C (131°F). 

lenergy.com.au +1

Key temperature-related behaviors include:

• Power Derating (40°C+): At temperatures higher than 104°F (40°C), the system may trigger power derating to prevent optimal, high-heat operation.

• Maximum Temperature (55°C): The official operating temperature range is -20°C to 55°C (-4°F to 131°F). If temperatures exceed this, the battery will likely shut down to prevent damage.

• Immediate Safety Shutdown: Although not explicitly stated as a single "toggle off" temperature, LiFePO4 batteries generally face thermal instability above 60°C (140°F), and SigenStor includes7 sensors per module to monitor for such scenarios.

• Automatic Heating (Below 0°C): If the cell temperature is below 0°C (32°F), the battery will not charge and will activate a built-in heating module, which may look like a temporary self-toggle into a "heating mode". 

  Smart Energy Council +4

If the unit is constantly shutting down or "toggling," it may indicate inadequate ventilation or direct sunlight exposure, which can cause overheating

12 minutes ago, Hummin said:

Your battery load is 4 + kwh?

House using shy of 2kWh, the rest going to batteries.

2 minutes ago, KhunLA said:

House using shy of 2kWh, the rest going to batteries.

Same here, but I figured out I could control how fast my batteries loaded to control the cell temperature. Could be useful on days where outside temperatures reaches 40c.

I will run aircon on days with higher temperature anyway, but getting full loaded batteries in 3 hours instead of 2, doesnt matter, and if rainy days I can open up for full loaded again.

6 minutes ago, Hummin said:

Same here, but I figured out I could control how fast my batteries loaded to control the cell temperature. Could be useful on days where outside temperatures reaches 40c.

I will run aircon on days with higher temperature anyway, but getting full loaded batteries in 3 hours instead of 2, doesnt matter, and if rainy days I can open up for full loaded again.

We pretty much leave it on auto pilot, from when installer set it up. This is the first time I ever peeked at the temps.

Only thing we ever adjusted was setting for grid to kick in, and only because one got returned, so only one for a few months. So dropped it from 50% to 30%.

First couple weeks had system, played with export, on & off a few days, just testing, till we got new digital meter.

We rarely bother with the system. I check overnight usage every now & then, make sure battery isn't having same issue as before, draining kWh quicker than kWh used.

On 3/15/2026 at 12:40 PM, Crossy said:

Yeah, the PEA rules are a little more nuanced than simply "no export from systems with batteries".

Generally it boils down to not being permitted to export energy from batteries to grid, provided any export is coming from the solar directly then batteries do not enter the equation.

I asked my favourite AI system (which it admits can be wrong), here is our conversation as a .pdf. we can't upload .pdf files so this is a link to my OneDrive.

https://1drv.ms/b/c/22162f5b8872d05b/IQD4li_YzurzRIgRAD3WVMtkAbjXtJ059g4cO29QsgEpFhk?e=1wHdGI

It should be viewable by anyone, please let me know if it won't open for you.

Could open the link. Got an error message but I could download the PDF.

Thanks for that!

2 hours ago, Hummin said:

Your battery load is 4 + kwh? However outside temperatur of my batteries is room temperature, but the core cell temp while it is loading is going up above 40 if I do not regulate load. At times I have over 7kwh load, while I restricted my load now to be only 4kwh to not overheat the batteries which will degenerate the lifespan of the batteries over years.

SigenEnergy info

SigenStor batteries are designed to toggle off (shutdown or restrict power) to protect the system when internal cell temperatures exceed safe operating limits, typically starting to restrict power around

40°C (104°F) and reaching a maximum operational limit of 55°C (131°F). 

lenergy.com.au +1

Key temperature-related behaviors include:

• Power Derating (40°C+): At temperatures higher than 104°F (40°C), the system may trigger power derating to prevent optimal, high-heat operation.

• Maximum Temperature (55°C): The official operating temperature range is -20°C to 55°C (-4°F to 131°F). If temperatures exceed this, the battery will likely shut down to prevent damage.

• Immediate Safety Shutdown: Although not explicitly stated as a single "toggle off" temperature, LiFePO4 batteries generally face thermal instability above 60°C (140°F), and SigenStor includes7 sensors per module to monitor for such scenarios.

• Automatic Heating (Below 0°C): If the cell temperature is below 0°C (32°F), the battery will not charge and will activate a built-in heating module, which may look like a temporary self-toggle into a "heating mode". 

  Smart Energy Council +4

If the unit is constantly shutting down or "toggling," it may indicate inadequate ventilation or direct sunlight exposure, which can cause overheating

How do you imagine you are measuring core temperature?

Batteries have no internal sensors.

The sensor on your battery pack is external, and it's reading is entirely dependent on where it was attached.

My temp sensor is placed between two batteries.

Yours could be stuck to the heatsink of your BMS if the person who assembled your battery was particularly lazy or incompetent.

14 minutes ago, BritManToo said:

How do you imagine you are measuring core temperature?

Batteries have no internal sensors.

The sensor on your battery pack is external, and it's reading is entirely dependent on where it was attached.

My temp sensor is placed between two batteries.

Yours could be stuck to the heatsink of your BMS if the person who assembled your battery was particularly lazy or incompetent.

Sigenenergy products are plug and play, shouldn't be any incompetent lazy Engineer faults anywhere. And the company I used,, I believe was one of the better. From start planning and Contracting to accomplished system, where I was very pleased to experience the hole process.

Sigenergy's SigenStor products are designed as a plug-and-play, modular 5-in-1 energy storage system, aimed at simplifying the installation process for solar and battery storage. The components, including battery modules and inverters, feature integrated connectors that allow for quick stacking and connection without complex wiring.

Sigenenergy battery modules use multiple built-in sensors to provide cell-level temperature monitoring, which effectively measures the internal "core" conditions of the battery pack

https://www.sigenergy.com/us/products/sigenstor

10 minutes ago, Hummin said:

Sigenenergy products are plug and play, shouldn't be any incompetent lazy Engineer faults anywhere. And the company I used,, I believe was one of the better if not the best.

Sigenergy's SigenStor products are designed as a plug-and-play, modular 5-in-1 energy storage system, aimed at simplifying the installation process for solar and battery storage. The components, including battery modules and inverters, feature integrated connectors that allow for quick stacking and connection without complex wiring.

Sigenenergy battery modules use multiple built-in sensors to provide cell-level temperature monitoring, which effectively measures the internal "core" conditions of the battery pack

https://www.sigenergy.com/us/products/sigenstor

Betteries don't have internal temperature sensors.

You can only ever measure the exterior temperature.

And that temp reading will be dependent on where the sensor is taped.

You are just quoting sales brochures ........ that mean nothing.

If you read averag core temperature wherever they measure that, that's going to be my reference point, right?

So let us keep it that way. And we can agree the bigger load in shorter time will make the battery increase in temperature?