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How much would a solar system cost (ball-park estimate) for a modestly sized home?

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  • Yes I have read the OP comment, but if he is using the AC's at night time only a Solar System will not reduce his Power Bill significantly.

  • BritManToo
    BritManToo

    You're betting the PEA won't notice, if they do, they'll fit a digital meter and might even add your generated electricity to your bill. Sure, you can get away with winding a meter back for a whi

  • Mo Sawadee
    Mo Sawadee

    What? Systems reverse your meter during generation and draw during the evening… it’s a credit / debit system!    Don’t you get generation credit during the daytime and debit use in the eve

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At 2k(not including night) a month AC bill it will probably  never pay for itself.  Throw in ongoing maintenance and opportunity lost (5% return on whatever you spend))  and you would probably have to triple you AC bills to  break even in 8 years. 

 

I have solar and love it but breaking even for most on this forum is a pipe dream. My 9kW solar setup was low-cost.  DIY combined with locals that instaul farm water pumps cost roughly 135k (included 13.4kWH battery ).  Probably could do it for 10k-15k less today because battery prices and panels are down.

 

You can buy the panels yourself (35k-45k) and learn about what resources in the area are available for the instaul at the same time.  Some here can do the install themselves and I'm definitely not one of them.  Buy a 10kW inverter on Lazada for 23k and have the installers hook it all up ( I paid 2 baht per watt ).  It is that easy and any problem that comes up was easy for me to resolve.  I'm a fool when it comes to electricity but even I was easily able to ask questions on forums and resolve issues.  

 

Just do it and have some fun. Your needs are not large so you don't need to break the bank on a pristine setup.  Also oversize everything. You think you need a 5kwh inverter - get a 10 kwh inverter and same goes with the panels.  You mentioned hot water heaters.  Mine  are efficient but on startup they will trip the breakers if ACs are also running.  Another reason to get a bigger inverter or just have the heaters run off the grid.

 

 

22 hours ago, Packer said:

64,000

 

6.2kw

 

Listed as saving 3,000 per month. Which is about right for modest homes that don't have pool pumps electric cars etc

 

https://www.lazada.co.th/products/on-off-grid-hybrid-inverter-6200-nm-eco-62kw-550w-10-i5184472859-s22012340021.html?

 

 

Huawei 3 phase 5kw 10 year warranty

 

121,000

 

https://www.lazada.co.th/products/huawei-5k-3phase-sun-2000-5ktl-m13p550w-10-i5261573174-s22361988282.html?

I have 2 huawei systems. A 10kw single phase (2 x 5kw inverters) with 15kw battery. The other a 5kw 3phase no battery system. 

 

Although happy with their reliability, i suggest studying the cost/compatibility of batteries if future expansion is required. 

 

There are cheaper options out there. 

30 minutes ago, Farma said:

I have 2 huawei systems. A 10kw single phase (2 x 5kw inverters) with 15kw battery. The other a 5kw 3phase no battery system. 

 

How much did each cost please?

 

Both could be suitable for me.

 

 

I had my systems installed a few years ago and prices have changed a lot. Huawei battery costs up 150+% etc. 

 

I've found the more battery you have the lower your power bill will be.


I've also found huawei will only accept huawei batteries. Other systems are more flexable. 

 

Another thing to take into account is your elec usage will increase as you relax due to free solar. 

 

Huawei techs recommended higher panel input. I have 14.9kw panels feeding the 10kw inverters and 7.5kw panels feeding the 5kw system. 

 

My 10kw system is in a combined commercial/residential building with a daily usage 50kwh upwards. The battery is usually down to its minimum 20% around 2000 hrs. 

 

Screenshot_20250708_192922_FusionSolar.jpg.a28fcad4fb84daa9b4bd06dabeabec83.jpg

The 5kw system is a commercial building open 0800 - 2000 daily. Daily usage varies around 30kw. 

Screenshot_20250708_192955_FusionSolar.jpg.9b255a42ab15b14ad81ddbcb9a68c8ed.jpg

 

 

On 7/6/2025 at 3:48 PM, Hummin said:

Anyone made a roof you can set for different seasons or follow the sun ?

Has anyone done a solar system in a condo?  Top floor, corner unit. Patrick 

1 hour ago, pchansmorn said:

Has anyone done a solar system in a condo?  Top floor, corner unit. Patrick 

Does your balcony face south ? 

Are you allowed to extend panels off your balcony ?

 

If you could use 6 pv, how many hrs good exposure would they get ?

panels are 1m X 2m, would that even be possible.

~6 X 600w PV = 3.6 for max 3kW inverter

To estimate the number of square meters of solar panels needed to power a medium-sized home with 2 air conditioners (and no electric water heater or stove), let’s break it down.


Step 1: Estimate Daily Electricity Usage

Here’s a typical breakdown:

Appliance / Load Estimated Daily Use
Refrigerator 1.5–2 kWh/day
Lighting, plugs, TV, small appliances 2–4 kWh/day
2 Air Conditioners (Split type, ~900W–1200W each, 4–8 hours/day) 6–12 kWh/day
WiFi, chargers, etc. ~1 kWh/day

Estimated total daily usage:
➡️ 10–18 kWh per day
Let’s use 15 kWh/day as a reasonable average.


Step 2: Solar Panel Output (per square meter)

Solar panel output depends on:

  • Panel efficiency (average: 18–22%)

  • Sunlight hours per day (Thailand or similar tropical areas: ~5.5–6 peak sun hours/day)

  • Real-world conditions (dust, angle, inverter loss ≈ 20% loss)

1 m² of solar panels typically generates:
➡️ ~150–180 Wh per day (under real-world conditions)

Let’s take 160 Wh/day per m² as a working average.


Step 3: Calculate Required Area

Daily need: 15,000 Wh
Output per m²/day: 160 Wh

Required area=15,000160≈93.75 m2\text{Required area} = \frac{15,000}{160} ≈ 93.75 \text{ m}^2Required area=16015,00093.75 m2

Final Estimate:

➡️ Approximately 90–100 m² of solar panels
for a medium-sized home with 2 aircons (no electric stove/water heater).


🔧 Notes:

  • If your aircon use is low (e.g., night-only), 70–80 m² may be sufficient.

  • If you use batteries (for nighttime or blackout use), extra panels may be needed.

  • Always check local solar irradiance, roof size, and consult an installer for shading/angle optimizations.

  •  

The company I used wanted around 105,000 to install a 10KW system with no batteries.

On 7/6/2025 at 8:05 PM, Packer said:

Our house has good insulation properties. Light A/C usage. Perhaps 7pm to midnight. With another 2 A/C 9-11pm. Computer and TVs used all day.

 

The monthly usages maxes out at 479 units in May. 2200 THB

385 units in April

377 units in March.

 

We'd probably turn on the A/C in the daytime if it's free from solar. We might well run at least one A/C 24/7 if it's free. 

 

I guess a 600KW set up would do?

 

How much for:

 

1. A 600Kw setup with batteries.

2. A 600Kw setup without batteries.

 

Bought and installed? 

600kW might be a tad oversized unless you are powering a village.

On 7/6/2025 at 5:05 PM, Packer said:

Our house has good insulation properties. Light A/C usage. Perhaps 7pm to midnight. With another 2 A/C 9-11pm. Computer and TVs used all day.

 

The monthly usages maxes out at 479 units in May. 2200 THB

385 units in April

377 units in March.

 

We'd probably turn on the A/C in the daytime if it's free from solar. We might well run at least one A/C 24/7 if it's free. 

 

I guess a 600KW set up would do?

 

How much for:

 

1. A 600Kw setup with batteries.

2. A 600Kw setup without batteries.

 

Bought and installed? 

1Kw setup gets you 3 units a day, or 100 units a month.

10 minutes ago, BritManToo said:

1Kw setup gets you 3 units a day, or 100 units a month.

 

3 units a day doesn't mean much to me.

 

The important thing is presumably what it can run at the same time. For example:

 

1 x 18,000BTU air con set to 16 degrees from sun up to sun down

1 big fridge

1 85 inch tv

1 computer

 

All running at the same time during the day.

 

How many Kw needed to run them all at the same time? 

1 hour ago, Packer said:

 

3 units a day doesn't mean much to me.

 

The important thing is presumably what it can run at the same time. For example:

 

1 x 18,000BTU air con set to 16 degrees from sun up to sun down

1 big fridge

1 85 inch tv

1 computer

 

All running at the same time during the day.

 

How many Kw needed to run them all at the same time? 

Except for the AC, I would expect the others to use no more 500w and hour.  

 

... computer hardly anything

... TV, should have usage on back of, our 55" uses 100w/hr (accurate/tested)

... we have 2 medium size frigs, and overnight, they use <200w/hr

 

AC, does it really need to be set to 16°C as we keep ours around 26°C +/-, but 24°C would be cold for us.   If inverter, once at temp, compressor shouldn't be cycling on / off that much.  At temp, added to the rest and <1kWh / hr

15 minutes ago, KhunLA said:

Except for the AC, I would expect the others to use no more 500w and hour.  

 

... computer hardly anything

... TV, should have usage on back of, our 55" uses 100w/hr (accurate/tested)

... we have 2 medium size frigs, and overnight, they use <200w/hr

 

AC, does it really need to be set to 16°C as we keep ours around 26°C +/-, but 24°C would be cold for us.   If inverter, once at temp, compressor shouldn't be cycling on / off that much.  At temp, added to the rest and <1kWh / hr

Some people is used to run ac with doors open 😉

8 minutes ago, Hummin said:

Some people is used to run ac with doors open 😉

In TH, that would defeat the purpose, as RH is always ~60-80%, and that's not even rainy season.   Fan on high, compressor on constantly, and he'd be using 2-3kWh / hr. vs 300-500w / hr if used at normal temp & house closed up.

12 minutes ago, KhunLA said:

In TH, that would defeat the purpose, as RH is always ~60-80%, and that's not even rainy season.   Fan on high, compressor on constantly, and he'd be using 2-3kWh / hr. vs 300-500w / hr if used at normal temp & house closed up.

Well, that's what some people do, aircon 24/7 and balcony door open is not unusual for many

5 minutes ago, Hummin said:

Well, that's what some people do, aircon 24/7 and balcony door open is not unusual for many

OK, small condo, with just the balcony open, so no real air flowing through, and chilling on balcony with a fan blowing air out on you would work.  But not all day.

1 minute ago, KhunLA said:

OK, small condo, with just the balcony open, so no real air flowing through, and chilling on balcony with a fan blowing air out on you would work.

I see it also in houses, especially those who rent holiday home included electricity. A couple of friends included who came visiting us. Seems for many it is convenient as long they do not need to think about the economical issue.

 

Having aircone running at 16c, means it is either to small for the areale, old and not working properly or windows and doors open. 

 

We run our at 21c - 22c 36m2 12500btu for comfortable sleeping temperature, and I prefer it a bit cold. 

5 hours ago, Dr. Zorg said:

To estimate the number of square meters of solar panels needed to power a medium-sized home with 2 air conditioners (and no electric water heater or stove), let’s break it down.


Step 1: Estimate Daily Electricity Usage

Here’s a typical breakdown:

Appliance / Load Estimated Daily Use
Refrigerator 1.5–2 kWh/day
Lighting, plugs, TV, small appliances 2–4 kWh/day
2 Air Conditioners (Split type, ~900W–1200W each, 4–8 hours/day) 6–12 kWh/day
WiFi, chargers, etc. ~1 kWh/day
 

Estimated total daily usage:
➡️ 10–18 kWh per day
Let’s use 15 kWh/day as a reasonable average.


Step 2: Solar Panel Output (per square meter)

Solar panel output depends on:

  • Panel efficiency (average: 18–22%)

  • Sunlight hours per day (Thailand or similar tropical areas: ~5.5–6 peak sun hours/day)

  • Real-world conditions (dust, angle, inverter loss ≈ 20% loss)

1 m² of solar panels typically generates:
➡️ ~150–180 Wh per day (under real-world conditions)

Let’s take 160 Wh/day per m² as a working average.


Step 3: Calculate Required Area

Daily need: 15,000 Wh
Output per m²/day: 160 Wh

Required area=15,000160≈93.75 m2\text{Required area} = \frac{15,000}{160} ≈ 93.75 \text{ m}^2Required area=16015,00093.75 m2

Final Estimate:

➡️ Approximately 90–100 m² of solar panels
for a medium-sized home with 2 aircons (no electric stove/water heater).


🔧 Notes:

  • If your aircon use is low (e.g., night-only), 70–80 m² may be sufficient.

  • If you use batteries (for nighttime or blackout use), extra panels may be needed.

  • Always check local solar irradiance, roof size, and consult an installer for shading/angle optimizations.

  •  

 

That sounds like an AI answer, and the calculations are way off.

1 hour ago, KhunLA said:

AC, does it really need to be set to 16°C

 

That is true.

 

But if it is free and the solar system doesn't include a battery, the point is to get the house as cold as possible for free in the daytime, so the evening aircons on in the evening and night time need to do very little work.

This quote a got over a year ago. Not realized yet, but planned to do it end of this year.

Note solar.jpg

quote turnkey solar.jpg

If you ae interested, the "solar global atlas" might be a help for optimal tilt of your panels. And lots of additional information that can be used.

You choose on the map your location.

(the example is not where I live :))

Solar global atlas.jpg

The solar panels are cheap enough. I have 11 in constant use. It's the batteries that cost the big dosh.

16 minutes ago, Stiddle Mump said:

The solar panels are cheap enough. I have 11 in constant use. It's the batteries that cost the big dosh.

Battery prices are down 30-40% within the last 12 month, you can get a 300Ah Battery for 50.000 to 65.000THB.

 

image.png.cd914d097f2c7269e5aaf65924e80382.png

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