Solar panels 2025 ready to install but lots of Questions!

[kwak250]

We will have our house finished in August and looking at fitting solar panels
Last time we looked we thought we would need many more panels but now new panels are 700w

 

We also hoped we could run the meter backwards in the day but now have a nasty digital meter
I remember Crosy ? saying to look at the units you use between 9am-4.30pm to see how many units you use and how many panels would be needed

Probably best to live in the house for 2-3 months to get a good idea
Would like to get the panels up straight away really while the car port is being built (12x 6 m)

We have a 1,5hp pool pump which i am told you should run 4 hours morning and afternoon 
Would it be a good idea to install a system that would give say 60 units a day so would need panels and  battery as that is near to what we would use

Also told the installation cost can double the price of the DIY install
Is it a good idea going through Homepro/Global?
Many thanks for your time 

[Bandersnatch]

1 hour ago, kwak250 said:

Is it a good idea going through Homepro/Global?

 

Last time I checked they were still quoting about ฿10 per Watt and I have never seen them stock bigger panels. You will have to go online for more competitive prices.

 

I recently paid for Trina 705 Watt panels ฿2,780 each or ฿3.9 per watt

[kwak250]

4 hours ago, Bandersnatch said:

 

Last time I checked they were still quoting about ฿10 per Watt and I have never seen them stock bigger panels. You will have to go online for more competitive prices.

 

I recently paid for Trina 705 Watt panels ฿2,780 each or ฿3.9 per watt

That seems a good price
Would love to try to diy this but going to see what local fitters will charge

[kwak250]

Looking at the XL homepro package with a 10kw battery i am looking at around 800k?

Must be cheaper options
 

[Bandersnatch]

7 hours ago, kwak250 said:

Looking at the XL homepro package with a 10kw battery i am looking at around 800k?

Must be cheaper options

 

I would never consider a solar install quote that doesn't breakdown the costs per line. It's important to know the costs of the main components and then you can see the markup.

 

I put some prices in this discussion:

https://aseannow.com/topic/1319773-solar-power-is-cheap-and-it’s-going-to-get-even-cheaper-very-soon/

 

Supply and fit is always going to cost you more. 

 

Maybe share where you are located and people can recommend a local installer. I can recommend my installer in Surin/Buriram although he is very busy these days  - not helped by the fact that I keep recommending him.

 

[BritManToo]

Without air-con my 3 bed house uses 8 units a day and a 5kwhr battery is just about enough.

15Kwhr batteries cost around 50,000bht.

Installers usually want 100kbht plus a markup on all the parts.

 

Don't think you can beat these , 1,745bht inc delivery

[UWEB]

7 hours ago, kwak250 said:

Looking at the XL homepro package with a 10kw battery i am looking at around 800k?

Must be cheaper options
 

Home Pro is selling Huawei Equipment, what makes it very expensive beside that their prices are far over the top. Just have a look on some other old threads to get more informations. My new neighbor just has got a Quote for a 10kwp System with 10 kwh Battery for 340K fully installed, Deye Hybrid Inverter,Longi Panels and LVTopsun Battery.

[UWEB]

40 minutes ago, UWEB said:

Home Pro is selling Huawei Equipment, what makes it very expensive beside that their prices are far over the top. Just have a look on some other old threads to get more informations. My new neighbor just has got a Quote for a 10kwp System with 10 kwh Battery for 340K fully installed, Deye Hybrid Inverter,Longi Panels and LVTopsun Battery.

Forgot to mention that the Quote is for a 3 phase System.

[kwak250]

1 hour ago, UWEB said:

Home Pro is selling Huawei Equipment, what makes it very expensive beside that their prices are far over the top. Just have a look on some other old threads to get more informations. My new neighbor just has got a Quote for a 10kwp System with 10 kwh Battery for 340K fully installed, Deye Hybrid Inverter,Longi Panels and LVTopsun Battery.

That seems a great price

I will have a look thanks

[atpeace]

What did you decide to do?

 

My recommendation would have been to buy the components yourself and find an installer which is difficult.  You will find many people while buying panels and inverters that can also do the installations. Online is great but there are advantages to buying at least some of the components  locally so you start to get a better understanding of what resources are available to you in the area.  This greatly reduces maintenance anxiety.  People like Crossy can do it themselves but I would probably do more damage than good trying to resolve complicated issue that will arise the first year while your still changing the setup.

 

My nice 9 kW solar setup without batteries cost around 85k and now(8 months later ) would cost 75k baht.  13.4 kWH battery cost 50k and I hooked it up so it had to be easy 🙂  

[kwak250]

On 7/7/2025 at 1:26 AM, atpeace said:

What did you decide to do?

 

My recommendation would have been to buy the components yourself and find an installer which is difficult.  You will find many people while buying panels and inverters that can also do the installations. Online is great but there are advantages to buying at least some of the components  locally so you start to get a better understanding of what resources are available to you in the area.  This greatly reduces maintenance anxiety.  People like Crossy can do it themselves but I would probably do more damage than good trying to resolve complicated issue that will arise the first year while your still changing the setup.

 

My nice 9 kW solar setup without batteries cost around 85k and now(8 months later ) would cost 75k baht.  13.4 kWH battery cost 50k and I hooked it up so it had to be easy 🙂  

Hi just got back from the UK 
Not yet decided as tiles/kitchen/pool are still being fitted
I was thinking i should stay in the house for a few months to get an idea of how many panels (Battery if i go that way) are needed
i am guessing we will be paying 8-9k baht a month on electricity so will look into it in a few months
 

Probably be finished start of September which will be cooler than April crazy heat time but at least i can add a few panels around that time if needed

[atpeace]

3 hours ago, kwak250 said:

Hi just got back from the UK 
Not yet decided as tiles/kitchen/pool are still being fitted
I was thinking i should stay in the house for a few months to get an idea of how many panels (Battery if i go that way) are needed
i am guessing we will be paying 8-9k baht a month on electricity so will look into it in a few months
 

Probably be finished start of September which will be cooler than April crazy heat time but at least i can add a few panels around that time if needed

Cool - hope all goes well with the new projects. Wow, you use a lot of electricity and I think you mentioned you don't have an EV.  Must be a big home. I have 3 ACs, 3 water pumps, an EV, and many of electronics but only max out at about 4,500 baht.

[kwak250]

1 hour ago, atpeace said:

Cool - hope all goes well with the new projects. Wow, you use a lot of electricity and I think you mentioned you don't have an EV.  Must be a big home. I have 3 ACs, 3 water pumps, an EV, and many of electronics but only max out at about 4,500 baht.

I am only guessing the consumption as our current house has 2 air cons running around 20 hours a day and usually pay around 4-5k a month
Our new house will have 2 addition air cons and a pool so just an estimate it will be 8-9k but then the 2 extra air cons will only be used maybe 6 hours each a day but will be for 2 large rooms
With the pool pump as well might be 7-8k but oh and also water pumps as well .No EV car but lots of electronics
4-5k is March-July i just got a 4200 baht bill last month so expect it to drop to maybe 3k by December

[kwak250]

On 7/7/2025 at 1:26 AM, atpeace said:

 

My nice 9 kW solar setup without batteries cost around 85k and now(8 months later ) would cost 75k baht.  13.4 kWH battery cost 50k and I hooked it up so it had to be easy 🙂  

9kw for 85k sounds amazing
Looking at 10kw to be installed to start and its around 360k installed
Going to have a drive around and see if i can find some that will install cheaper
Also a 10kw battery is also around 350k
Saying that these prices are homepro/global type of places

[BritManToo]

7 hours ago, kwak250 said:

Also a 10kw battery is also around 350k

39kbht for 15Kw on Lazada

https://www.lazada.co.th//products/i5115496445-s21583884554.html

[atpeace]

8 hours ago, kwak250 said:

9kw for 85k sounds amazing
Looking at 10kw to be installed to start and its around 360k installed
Going to have a drive around and see if i can find some that will install cheaper
Also a 10kw battery is also around 350k
Saying that these prices are homepro/global type of places

Checkout Lazada as Britmantoo recommended.  I could do my setup for less today than 10 months ago when I installed everything.  LifePo4 batteries are dropping in prices every month and so are solar panels. 

 

You should be able to do your whole setup with a 15Kw battery for under 160k installed.  IMO, don't add in too much redundancy as I'm sure homepro/golbal do to add to the total price.  If something breaks, hasn't happened to me, then just switch back to the grid until you can remedy it.  There are only 3 major components that can cause an issue.  Solar panels (very rare), inverter ( easy to get replacement in days), and the battery (easy to replace  or fix ).

 

I see solar panel sellers all the time driving around Thailand and as usual here the shops are all close to each other. I just found where they were and stopped by three and told them I just wanted the panels mounted and wired to my inverter. The shop I chose charged 2 baht per watt of solar panels plus about another 7k in for the metal frame and parts.   I added the battery a week later myself and just needed a phillips screwdriver and done in 5 minutes. Need a few people to lift it and put where you want.

 

 

[kwak250]

5 minutes ago, atpeace said:

Checkout Lazada as Britmantoo recommended.  I could do my setup for less today than 10 months ago when I installed everything.  LifePo4 batteries are dropping in prices every month and so are solar panels. 

 

You should be able to do your whole setup with a 15Kw battery for under 160k installed.  IMO, don't add in too much redundancy as I'm sure homepro/golbal do to add to the total price.  If something breaks, hasn't happened to me, then just switch back to the grid until you can remedy it.  There are only 3 major components that can cause an issue.  Solar panels (very rare), inverter ( easy to get replacement in days), and the battery (easy to replace  or fix ).

 

I see solar panel sellers all the time driving around Thailand and as usual here the shops are all close to each other. I just found where they were and stopped by three and told them I just wanted the panels mounted and wired to my inverter. The shop I chose charged 2 baht per watt of solar panels plus about another 7k in for the metal frame and parts.   I added the battery a week later myself and just needed a phillips screwdriver and done in 5 minutes. Need a few people to lift it and put where you want.

 

 

Thanks very much

Just about to have a coffee then have a look

I have a 12m×6m carport which I had made to take the weight of solar panels

It's quite far from the house but if a solar shop can mount them and  wire it all up to the inverters and run a cable to the house  then that would be amazing

Did you buy your own panels /inverters?

[BritManToo]

22 minutes ago, kwak250 said:

Thanks very much

Just about to have a coffee then have a look

I have a 12m×6m carport which I had made to take the weight of solar panels

It's quite far from the house but if a solar shop can mount them and  wire it all up to the inverters and run a cable to the house  then that would be amazing

Did you buy your own panels /inverters?

These 580w panels are amazing, 50 percent more output than the older 340w panels.

and less than 2,000bht inc delivery on voucher days.

https://www.lazada.co.th/products/rapd-mono-600w-580w-bifacial-n-type-doubleglass-600w-2-30-i5366117184-s22810903613.html

[atpeace]

1 minute ago, kwak250 said:

Thanks very much

Just about to have a coffee then have a look

I have a 12m×6m carport which I had made to take the weight of solar panels

It's quite far from the house but if a solar shop can mount them and  wire it all up to the inverters and run a cable to the house  then that would be amazing

Did you buy your own panels /inverters?

Yep, I wasted too much time worrying about the install because as most people I  like to have everything lined up and understood.  Finally just threw caution to the wind and bought the inverter 6.2KW(can handle 9kw panels but will only produce 6.5Kw max).  Then I found local panel shops ( sell to farms here and rarely do house installs but they can figure it out ).  Bought the panels locally because I wanted to have local expertise incase something went wrong.  Also figured they would be more apt to provide better service if I bought panels from them.  Probably would buy the inverter from the same shop which would simplify the install quotes. Simply buy panels and inverter if they have and ask how much to put on my roof ( have a picture of the roof).

 

As Britmantto recommended at the time I oversized everything (in your case I would go 15Kw panels, 20Kw inverter, and 15-20Kw battery ) and now wish I would have gone even bigger.  I have a small home, 3 water pumps, three ACs, and an EV.  I use about 700 Kw a month. My 13.4 Kw battery has never gone below 25% overnight  and usually sits around 65% in the morning. 

 

Many people on this forum that can help with technical questions.  Sometimes they don't understand how difficult some tasks are for people like myself with little electrical knowledge but they can steer you in the right direction.  Many simply buy all the components and get their welder out and attach them to the roof and put the whole system together.  Not me!

[BritManToo]

2 hours ago, atpeace said:

Many simply buy all the components and get their welder out and attach them to the roof and put the whole system together.  Not me!

I purchased an electric welder and angle grinder for my install, not expensive.

Then all you need is some stainless box steel, some welding rods and off you go.

Used my existing drill and bits.

 

I never recommend putting stuff on the house roof, carport or similar is best for solar panels.

You do need to clean them, and that ain't easy on a 2 floor house roof, not to mention leaks.

[kwak250]

Just had a look at Global / SCG / Dohome  and all sell panels and all gave a number to call for someone to install

Found 705w panels @2690 baht which sounds grerat

 

Many thanks getting some great info already

The electrician who has done the wiring at our new house which is due to be completed next month says he can do them but not really interested as he is so busy and is in the middle of doing a resort so probably not worth coming back to us and probably not sure how much to charge

[kwak250]

5 hours ago, atpeace said:

 

 

Many people on this forum that can help with technical questions.  Sometimes they don't understand how difficult some tasks are for people like myself with little electrical knowledge but they can steer you in the right direction.  Many simply buy all the components and get their welder out and attach them to the roof and put the whole system together.  Not me!

Haha your still way ahead of me ,when you said you fitted the battery yourself after the system was running i was impressed .
It would take me much longer getting it out the box than the time it took you to get it fitted and wired up .

[kwak250]

Stopped off at Lightmax and found this 

10kw 3 phase system

Huawei inverter 

16 panels around 700w each

Without battery including instalation 230k

I was hoping to add a battery later but told that converter can only use a Compound ? Battery either Huawei or LG

The guy spoke excellent English which was a huge bonus

If with a battery I will be around 540k so probably going to do it without for now

I asked if I can use a different inverter than the Huawei one and he said he can do it which would mean it would be less that the 230k and also I can add a cheap Lazada special battery at 60-70k

What would you do?

 

[lom]

2 hours ago, kwak250 said:

What would you do?

Buy anything but Huawei with their proprietary/non-standard/incompatible/overpriced batteries.

[UWEB]

2 hours ago, kwak250 said:

Stopped off at Lightmax and found this 

10kw 3 phase system

Huawei inverter 

16 panels around 700w each

Without battery including instalation 230k

I was hoping to add a battery later but told that converter can only use a Compound ? Battery either Huawei or LG

The guy spoke excellent English which was a huge bonus

If with a battery I will be around 540k so probably going to do it without for now

I asked if I can use a different inverter than the Huawei one and he said he can do it which would mean it would be less that the 230k and also I can add a cheap Lazada special battery at 60-70k

What would you do?

 

Have changed out my one yer old Huawei 3 phase Hybrid Inverter for that reason, Deye replacement including 10 kwh Battery was cheaper than a Huawei Battery 10 kwh.

[kwak250]

26 minutes ago, UWEB said:

Have changed out my one yer old Huawei 3 phase Hybrid Inverter for that reason, Deye replacement including 10 kwh Battery was cheaper than a Huawei Battery 10 kwh.

Thanks the fact that i could not just add a cheap non-Huawei battery put me off
i will see what inverter he offers other than Huawei
Still learning about all this but knew when he said the battery is around 300k+ that i should change plans

 

[kwak250]

If i bought a 10kw inverter with 16x 700w panels would there still be enough power to charge a 10-15kw battery if i used around 30 units a day?

[lom]

6 hours ago, kwak250 said:

If i bought a 10kw inverter with 16x 700w panels would there still be enough power to charge a 10-15kw battery if i used around 30 units a day?

Yes, you could even charge bigger battery with that.

[motdaeng]

14 hours ago, kwak250 said:

If i bought a 10kw inverter with 16x 700w panels would there still be enough power to charge a 10-15kw battery if i used around 30 units a day?

do i understand this correctly ... from around 8 am to 6 pm you use about 30 units of electricity, and during the night only about 10 units?

what direction are the panels facing? to make the most of the solar-produced electricity, maybe consider a setup with east-south-west panels?

 

your 11 kw peak system will produce electricity based on its orientation (no shading) and the weather conditions. i assume you’re installing an on-grid system, because during bad weather, which can last for several days , the system will only generate a small fraction of what it produces on a sunny days ...

[kwak250]

7 hours ago, motdaeng said:

do i understand this correctly ... from around 8 am to 6 pm you use about 30 units of electricity, and during the night only about 10 units?

what direction are the panels facing? to make the most of the solar-produced electricity, maybe consider a setup with east-south-west panels?

 

your 11 kw peak system will produce electricity based on its orientation (no shading) and the weather conditions. i assume you’re installing an on-grid system, because during bad weather, which can last for several days , the system will only generate a small fraction of what it produces on a sunny days ...

We have not yet moved in to the new house as not yet completed but i am using around 25 units in the day at my current house and around 10-15 units in the evening around 5pm-8am
The night units will probably not change as we will have the 2 same a/cs running as we do at our current house
The new house will probably have at least 2 more a/c units running in the day around 24k btu each
Also a 1.5hp pool pump so i expect our day time units to go from 25 to at least 50?
I will be having a on-grid system

Panels will be facing south(i have had a car port made ready

3 phase
I have been talking to a solar supply shop which will fit Deye inverter and all the panels and i will add a battery unless they do one that is not going to be over charged