It's been in planning for some time, then suddenly I wind up with a small park and the joining 134 acres, oh why the heck not let's build a mega park... I must be insane
@@cleversolarpower This is very sad. I just found out tonight I will not be receiving the products I ordered roughly 3 weeks ago. I will not ever do business with Aolithium. I ordered multiple products from this company that reflected they were in stock. The company waited until the date I was suppose to receive the products (almost 3 weeks after I placed my order) to tell me they are no longer in stock.
Because the discharge rate is .5 we have to multiply by 2. So instead of a 100Ah battery, we need a 200Ah battery. So it's multiplied by 2. Or 1/0.5=2. If we multiply by 0.5 it would not be correct.
Hello! Thanks for sharing these useful tips with us. But i have a question. why do you size your pv array based on half of your battery bank total watt-hours for 3 days of autonomy? From what i understand the solar panels should be sized based on the total daily watt-hours?... Because they're there to replace what you take out from the batteries during one day....not three days.... you won't probably have to go for three days without sun very often...i'm a bit confused! 😢
The solar array should be sized to recharge the battery in one day of sun, 2-5 sunhours depending on location. The battery is sized for the loads, so they can run for 3 days. Hope this helps.
okay! Let's say we're in the caribbean islands,where we never go 3 three days without sun...will this sizing method be ok? And what i understand if we use a DOD of 50% in our calculation for a 3 day atonomy....we'll never reach that DOD unless we have non sun for three days. Wouldn't be better that we size our solar system based on what we consume daily?
Hello! I have one question regarding the last step. You took in to consideration the sun radion per square metre, should you consider the efficiency of solar panels them selfes? Please correct me if I’m mistaking. Anyway, great video. Thanks alot!
In section 4 "Battery size", could you please explain why you chose a voltage of 12V ? Later, in the last section of the video, we found powers ranging between 1000W and 2000W (1760W fo lead-acid and 1420 for lithium), so we should use a 24V battery. Shouldn't we ?
The inverter size depends on the load that we have to power. The load is expressed in watts, while the energy consumption is expressed in Wh. I think you confused power (Watts) with power consumption (Watt hours).
You have a valid point, you are not confused. He should’ve used 24V. He uses 12V as a baseline because in his mind he can double voltage and halve current. So, you should do this calculation with 24V and get 509Ah for lead-acid and 257Ah for lithium.
Hi Nick what can someone new in solar energy can do about a country that use 220v for the national system is the calculation is same if not can you explain thank you very much my teacher.
I'm using 220V myself. Calculation is all the same. DC is still 12,24, or 48V. The only thing that changes is the power calculation on the ac side. 110V*10A=1,100W. Or if you are on 220V with same appliance: 220Vx5A=1,100W.
The output of an off-grid inverter cannot synch with the grid power, thus it cannot send power back onto the grid. These are cheaper. Grid-tie inverters can send power back to the grid and are, therefore, more expensive. I made a video about different inverters. Check it out on my channel page.
I have a travel van with a 48 volt system, 210 amp hour of batteries with 200 watts of solar going through a 3500 watt inverter. It seems like I don’t get anything out of my solar panels as I lose about 10 percent of my state of charge per day in high sunlight days and months . Where should I be looking for improvement. This is a Renogy system. Can you help? Thanks Kelly
Is the voltage of the panels higher than the battery voltage? If not, it won't charge. Voltage of the solar panels has to be 5V higher than the battery. So in your case it should be 60V. I doubt your 200W of solar is reaching that voltage.
Have you made a video on solar charger selection (voltage and current) and sizing of power panels, taking into account that the panels are very unlikely to produce the rated power?
Do you mean sizing charge controllers or regular battery chargers? Indeed, I have accounted for this in the video. Sun hours is the amount of hours where you will have 1000w/m2. So we base the calculation on that. So a 100w panel produces 400wh in one day with 4 sunhours, but there are actually more sunhours in the day, but not at 1000W/m2. That makes up for the ~70% efficiency.
Figure on a 100 watt solar panel putting out 70 watts when it is hooked up to the system and operating in full sun and half that amount when the sky is 50% cloudy.
Best thing you can do is have your panel voltage to exceed your battery by at least 8 volts. This way it charges all day. Not just a small window in the middle of the day. Mine were charging as soon as the sun rose and almost untill it set.
Voltage is depends on the temperature, while irradiance effects current. So the voltage of your solar panel will be higher when there is no direct sun on it.
@@cleversolarpower I guess you didn't understand my meaning. If you have for instance a 12v panel with a peak of 14v it will only charge 12v during peak sun. Given that a 12v system needs the 14v to charge. If you use a 20v peak panel for 12v it will charge outside of peak sun as it doesn't need peak sun to reach 14v. The higher your voltage going to the controller, the more hours of use you can get out of the panels each day. You need less panels to charge the battery bank then. Or you have have a controller move the panels. I just over rated mine and let them sit. Dusk to dawn working and charging.
You got a new subscriber with this video. I want to add solar with the goal to be off grid 100%, is this even possible in a residential area in Houston with home consumption of 130kwh per day? I want to use the ecoflow ultra to store the batteries because it is easy to connect. I hope you can comment. Thanks
So for the UK, just to "keep the lights on", you would need six days of autonomy, and therefore need 10 x 12v 100ah lithium batteries (£2,000)? And about 3,000w solar panels to charge them? I suggest buying some candles!
I am so confused how you are converting 80% efficiency of lead acid battery to 1.25(*2) or how you 50% capacity is 2(*1). Are you trying to make the percentage to 1 whats the idea behind this
Energy in = energy out. (Sort of) Minus the efficiency losses. So if the energy gets directly used by the inverter, it just bypasses the 90% efficient factor of the inverter and the 99% of the battery efficiency. Which is not much.
For calculation of solar panels, actually you do not need to charge the battery fully in one day, that will cost too much solar panels.. you can charge the battery full in 2 days maybe. what is your idea?
If I may add... PV are general cheaper than more battery. So having more PV to charge quickly, ensures that you can have exces demand in summer, for AC...
That would require an incredible amount of money. You might want to hook up to the grid and then convert your spaces one at a time to see how it is going. Do not forget to position your solar panels to provide shade for the campers.
Not sure why you are stuck on 100Amps being a max for a system. The main limitation on LiFePO4 batteries is often the BMS that the manufacturer uses. Most of these battery cell can handle 3-5C with some being able to handle 10C at 100%DoD for 3000 cycles or 80%DoD for 5000+ cycles. So if the battery has a BMS that is able to handle it, 3000 watts on a single 100ah 200ah or 300ah 12v unit is nothing. My current home system uses a 12Kw inverter on a 51.2v nominal system that can surge to 36KW for 10 seconds and I have been just fine running on 450Ah of battery capacity for several years with standard 00AWG wire for the 2 battery connections to the busbar and 0000AWG from the busbar to the inverter. The BMS in each battery is capable of 220Amps continuous and 550Amp peak surge current. I will eventually be adding 560Ah more capacity in the near future but that is to allow for several more days of cloudy weather and not because the inverter needs it.
by this calculation I need (for 5000KWh/daily consumption) 20KWh battery and 50 - 500W solar panels, I need to reconsider my daily consumption and days of independence, maybe relocate somewhere southern :D :D :D
Lead acid batteries have a warranty, so if one goes bad in it’s warranties period, it gets replaced. Buy the ones that fit your car or truck. WallyWorld is great for replacing the batteries
@@cleversolarpower Does lithium batteries have a replacement warranty similar to FLA? I haven’t seen that yet. Can the lithium be recycled? Yes but the cost is more than mining the raw lithium
I would use a solar heater like a pool heater (black pipes sitting in sunlight) and a small solar panel powered recirculation pump to move the water through the pipes. Seems like direct sun heating would be more effecient!
Batteries are expensive and as you will get at least a little sunshine even on a cloudy day, I would recommend oversizing the solar system and going for a smaller battery size. From an economic standpoint, the depreciation on batteries is just too much compared to the cost of adding extra solar. It also depends on what is available: this equipement comes in specific sizes, you have to make the calculations with the panels, inverter and batteries that your potential supplier has available. If he has a 4 kWh battery, use ~3 kW panels, if he has 5 kWh, then ~2 kW should be enough.
I've been trying to find a good deal on solar panels but no luck beyond Amazon. Since I live in Canada I need to run a generator periodically to fill up after weeks of overcast 😅
@cleversolarpower You might be right. I'm a Biochemist and see things differently. To reduce the stress on any battery system, you attach it to a load that can't overheat.
Did anyone get the error in the last section of the video ? He confused solar radiation with number of sunny hours a day ! No ! Solar radiation (in kWh/m²/day) accounts for the amount of sun energy capted by a unit of surface. So, the calculations would be : * For lead-acid 6 112 Wh = 6.112 kWh 6.112 kWh divided by 3.47 kWh/m² = 1.76 m² That's almost one ordinary solar panel * For lithium 4 938 Wh = 4.938 kWh 4.938 kWh divided by 3.47 kWh/m² = 1.42 m² Could you plese confirm/correct ?
Using ChatGPT: *Question: Does a solar radiation of 5 kWh/m²/day mean that on average we have 5 hours of sun in a day ?! *Answer: No, a solar radiation of 5 kWh/m²/day does not necessarily mean that there are 5 hours of sunlight in a day. Solar radiation, typically expressed in kilowatt-hours per square meter per day (kWh/m²/day), refers to the total amount of solar energy received on a horizontal surface over the course of a day. It is a measure of the intensity of sunlight reaching the Earth's surface. The value of 5 kWh/m²/day indicates the total energy received from sunlight over the entire day, regardless of the duration of sunlight exposure. This value can vary depending on factors such as location, time of year, weather conditions, and atmospheric factors. In regions with longer daylight hours, the same amount of solar radiation may be spread over a longer period of time, resulting in lower intensity but longer duration of sunlight exposure. Conversely, in regions with shorter daylight hours, the same amount of solar radiation may be concentrated into a shorter period of time, resulting in higher intensity but shorter duration of sunlight exposure. Therefore, the solar radiation value of 5 kWh/m²/day does not directly correlate to the number of hours of sunlight in a day. It represents the total energy available from sunlight over the entire day, and the actual duration of sunlight exposure can vary depending on local conditions.
No, sunhours equals kW/m²/day. Solar panels at STC are rated at 1kW/m² at 25°C. Don't confuse sunhours with actual hours of sun per day. It could be that one day has 6 hours of sun at 500W/m². This is equal to 3 sunhours. Because 1 sunhour is 1000W/m².
🎁 Free diagrams: cleversolarpower.com
📖 My best-selling book: cleversolarpower.com/off-grid-solar-power-simplified
It's been in planning for some time, then suddenly I wind up with a small park and the joining 134 acres, oh why the heck not let's build a mega park... I must be insane
This is the best and most concise video on solar systems that I’ve seen
Wow, this is by far the most concise, clear explanation I've ever seen and heard. Very well done, sir. Thank you for the content.
Nice job! Thank you! Appreciate you walking through the whole process.
Thanks! My pleasure.
Very concise explanation for solar power. I'm going to build my own solar system based off this video lesson just to do it.
Good start! Checkout my playlist about different systems.
@@cleversolarpower This is very sad. I just found out tonight I will not be receiving the products I ordered roughly 3 weeks ago. I will not ever do business with Aolithium. I ordered multiple products from this company that reflected they were in stock. The company waited until the date I was suppose to receive the products (almost 3 weeks after I placed my order) to tell me they are no longer in stock.
Very valuable videos and explained in an academic way, thank you
Thanks! Glad you liked it.
Very useful with clear explanations. Thanks
Glad you liked it!
At 6:19 after 3 day autonomy the 50% discharge rate is .5 not 2 ,can you explain this maybe i am wrong . Thanks.
Because the discharge rate is .5 we have to multiply by 2. So instead of a 100Ah battery, we need a 200Ah battery. So it's multiplied by 2. Or 1/0.5=2. If we multiply by 0.5 it would not be correct.
@@cleversolarpower Thanks dear.
I am sorry I have another question which I forget how 1.25 is equal to 80% of capacity ,I think it's safety factor
Absolutely great content
Thank you Austin!
Thanks for the info - just ordered your book.
Thanks for your support!
Great video!
Thank you very much for this. Best solar advice ever ever☺.
Thanks for your explanation
Very usefull. Thank you.
Hello! Thanks for sharing these useful tips with us. But i have a question. why do you size your pv array based on half of your battery bank total watt-hours for 3 days of autonomy? From what i understand the solar panels should be sized based on the total daily watt-hours?... Because they're there to replace what you take out from the batteries during one day....not three days.... you won't probably have to go for three days without sun very often...i'm a bit confused! 😢
The solar array should be sized to recharge the battery in one day of sun, 2-5 sunhours depending on location. The battery is sized for the loads, so they can run for 3 days. Hope this helps.
I live in Arkansas and 3 days with no sun is common. My record is 12 days with no sun.
okay! Let's say we're in the caribbean islands,where we never go 3 three days without sun...will this sizing method be ok? And what i understand if we use a DOD of 50% in our calculation for a 3 day atonomy....we'll never reach that DOD unless we have non sun for three days. Wouldn't be better that we size our solar system based on what we consume daily?
@cleversolarpower
Hello! I have one question regarding the last step. You took in to consideration the sun radion per square metre, should you consider the efficiency of solar panels them selfes? Please correct me if I’m mistaking. Anyway, great video. Thanks alot!
I use the average sunhours per day, multiplied by the power rating (Wp) of the solar panels.
In section 4 "Battery size", could you please explain why you chose a voltage of 12V ?
Later, in the last section of the video, we found powers ranging between 1000W and 2000W (1760W fo lead-acid and 1420 for lithium), so we should use a 24V battery. Shouldn't we ?
The inverter size depends on the load that we have to power. The load is expressed in watts, while the energy consumption is expressed in Wh. I think you confused power (Watts) with power consumption (Watt hours).
You have a valid point, you are not confused. He should’ve used 24V. He uses 12V as a baseline because in his mind he can double voltage and halve current. So, you should do this calculation with 24V and get 509Ah for lead-acid and 257Ah for lithium.
You are SO HELPFUL - Thank you so much!!!
do we need to consider about over charge batteries condition?
Your charge controller will take care of the charging.
This is informative. First time, and I've subscribed.
Welcome aboard!
how about to the 20A solar controller is that enough for a 250w solar panel and 12v, 100ah lithium battery?
250/14.4=17.4A -> yes
hi@@cleversolarpowercan i ask again..how to set up the 30A mppt solar controller to 100ah lithium battery..thank u for the response
Hi Nick what can someone new in solar energy can do about a country that use 220v for the national system is the calculation is same if not can you explain thank you very much my teacher.
I'm using 220V myself. Calculation is all the same. DC is still 12,24, or 48V. The only thing that changes is the power calculation on the ac side. 110V*10A=1,100W. Or if you are on 220V with same appliance: 220Vx5A=1,100W.
@@cleversolarpower Thanks I bought your book yesterday looking foreword learning from it.
Excellent presentation. Which Solar Panels would you recommend for charging a Power Station like Anker, Bluetti or Ecoflow?
If you have space get poly, if you are limited by space get mono. Get rigid panels, not flexible. As for brands, no particular recommendation.
Hi. Live your videos. I am including begin building a 36 volt solar system.
Can you make a video that examples a 36 volt build?
Thanks, great job. What is the difference between off grid and grid tied inverter. Thanks a lot
The output of an off-grid inverter cannot synch with the grid power, thus it cannot send power back onto the grid. These are cheaper. Grid-tie inverters can send power back to the grid and are, therefore, more expensive. I made a video about different inverters. Check it out on my channel page.
I have a travel van with a 48 volt system, 210 amp hour of batteries with 200 watts of solar going through a 3500 watt inverter. It seems like I don’t get anything out of my solar panels as I lose about 10 percent of my state of charge per day in high sunlight days and months . Where should I be looking for improvement. This is a Renogy system. Can you help? Thanks Kelly
Is the voltage of the panels higher than the battery voltage? If not, it won't charge. Voltage of the solar panels has to be 5V higher than the battery. So in your case it should be 60V. I doubt your 200W of solar is reaching that voltage.
Thank You!
Have you made a video on solar charger selection (voltage and current) and sizing of power panels, taking into account that the panels are very unlikely to produce the rated power?
Do you mean sizing charge controllers or regular battery chargers? Indeed, I have accounted for this in the video. Sun hours is the amount of hours where you will have 1000w/m2. So we base the calculation on that. So a 100w panel produces 400wh in one day with 4 sunhours, but there are actually more sunhours in the day, but not at 1000W/m2. That makes up for the ~70% efficiency.
Figure on a 100 watt solar panel putting out 70 watts when it is hooked up to the system and operating in full sun and half that amount when the sky is 50% cloudy.
Best thing you can do is have your panel voltage to exceed your battery by at least 8 volts. This way it charges all day. Not just a small window in the middle of the day. Mine were charging as soon as the sun rose and almost untill it set.
Voltage is depends on the temperature, while irradiance effects current. So the voltage of your solar panel will be higher when there is no direct sun on it.
@@cleversolarpower The max voltage rating of the panel.
Go ahead and feed into the hype.
Or you could verify it.
Does the charge control also affect battery charge
@@cleversolarpower I guess you didn't understand my meaning. If you have for instance a 12v panel with a peak of 14v it will only charge 12v during peak sun. Given that a 12v system needs the 14v to charge. If you use a 20v peak panel for 12v it will charge outside of peak sun as it doesn't need peak sun to reach 14v. The higher your voltage going to the controller, the more hours of use you can get out of the panels each day. You need less panels to charge the battery bank then. Or you have have a controller move the panels. I just over rated mine and let them sit. Dusk to dawn working and charging.
The charge controller can adjust the voltage?
Thanks for the video, it's really helpful
You got a new subscriber with this video. I want to add solar with the goal to be off grid 100%, is this even possible in a residential area in Houston with home consumption of 130kwh per day? I want to use the ecoflow ultra to store the batteries because it is easy to connect. I hope you can comment. Thanks
130kWh per day? No 😅
@@cleversolarpower ok , is it because is too much? thanks
Good stuff! Thanks for sharing.
Thanks for watching!
Shouldn't 80% efficient be x1.2 not x1.25 please correct me if I'm wrong.
1/0.8=1.25 -> 100/1.25=80
So for the UK, just to "keep the lights on", you would need six days of autonomy, and therefore need 10 x 12v 100ah lithium batteries (£2,000)? And about 3,000w solar panels to charge them? I suggest buying some candles!
Off grid design suggests 3 days of autonomy. Sunhours is an average. If you are off grid then it's better to run a generator in winter.
Very informative 😮 Thanks.
The best video (solar) ever👍
Excellent videos! I cannot seem to download the 7 free schematics.
There was an error with the software. It should be fixed now. Thank you for mentioning it.
Is a 40A solar charge controller enough for a 550w solar panel alongside a 12v, 200ah battery
550W/14.4V=38.2A -> Yes
Thanks.. great job.
When using lead-acid batteries. If the design DoD is 50%. How do you make sure that you do not exceed this set limit?
You need an inverter you can set the shut-off voltage.
How can i get sun hours for Cairo/Egypt ?
pvwatts.nrel.gov enter your location in the top bar. Works all around the world.
thank you man
Does 48v 100ah battery can sustain my 12,000 watt-hour per day?
54.4V*100ah= 5440wh. So you need at least 3 batteries.
@@cleversolarpower In what connection? Series or parallel?
@@DeanWinchester-xm5esshould be parallel. If you put it in series, it would increase the voltage (I'm guessing your inverter would be limited to 48v)
Thanks, great videos
The 3.47 you used is kw/h/m2 not kw/h
I am so confused how you are converting 80% efficiency of lead acid battery to 1.25(*2) or how you 50% capacity is 2(*1). Are you trying to make the percentage to 1 whats the idea behind this
Yes me too,
I figured it out. It's 1/(80/100) let me know if its helps
We need to size double as we will be drawing power during day inclusive of charging battery
Double solar panel
Totally! This feels like crap! He did not explain these factors of multiplication at all.
inverter size?
Best breakdown ive seen. Amazing
Like information 🙏
10kw or more power setup guide please
Do you mean 10kw of solar or 10kw of batteries?
@@cleversolarpower system that can support a home
You have calculated Solar Panels for recharging Batteries only
What About Solar Panels required for daily load ???
Energy in = energy out. (Sort of) Minus the efficiency losses. So if the energy gets directly used by the inverter, it just bypasses the 90% efficient factor of the inverter and the 99% of the battery efficiency. Which is not much.
Thankyou sir
For calculation of solar panels, actually you do not need to charge the battery fully in one day, that will cost too much solar panels.. you can charge the battery full in 2 days maybe. what is your idea?
If I may add... PV are general cheaper than more battery. So having more PV to charge quickly, ensures that you can have exces demand in summer, for AC...
I need your cooperation, please guide me now I am working with solar team
You can contact me through my website.
J’aimerais beaucoup avoir c’est explications en français s.v.p.
You can enable auto translation to French 😉
I'm building/ rebuilding an rv park with 367 spots, and I want the entire park off grid!
It seems like a big project, every RV will want to plug in and use their big appliances, most likely AC too.
That would require an incredible amount of money.
You might want to hook up to the grid and then convert your spaces one at a time to see how it is going. Do not forget to position your solar panels to provide shade for the campers.
Not sure why you are stuck on 100Amps being a max for a system. The main limitation on LiFePO4 batteries is often the BMS that the manufacturer uses. Most of these battery cell can handle 3-5C with some being able to handle 10C at 100%DoD for 3000 cycles or 80%DoD for 5000+ cycles. So if the battery has a BMS that is able to handle it, 3000 watts on a single 100ah 200ah or 300ah 12v unit is nothing. My current home system uses a 12Kw inverter on a 51.2v nominal system that can surge to 36KW for 10 seconds and I have been just fine running on 450Ah of battery capacity for several years with standard 00AWG wire for the 2 battery connections to the busbar and 0000AWG from the busbar to the inverter. The BMS in each battery is capable of 220Amps continuous and 550Amp peak surge current. I will eventually be adding 560Ah more capacity in the near future but that is to allow for several more days of cloudy weather and not because the inverter needs it.
by this calculation I need (for 5000KWh/daily consumption) 20KWh battery and 50 - 500W solar panels, I need to reconsider my daily consumption and days of independence, maybe relocate somewhere southern :D :D :D
Yeah, it's not easy going off-grid 😬
Lead acid batteries have a warranty, so if one goes bad in it’s warranties period, it gets replaced. Buy the ones that fit your car or truck. WallyWorld is great for replacing the batteries
Lead acid is making way for lithium. Very cheap now, check my video where I compare lithium with lead acid.
@@cleversolarpower Does lithium batteries have a replacement warranty similar to FLA? I haven’t seen that yet. Can the lithium be recycled? Yes but the cost is more than mining the raw lithium
My battery is tank 300L of water.
I need warm water every day.
Solar panels straight to heating element?
@@cleversolarpower NO. There is a regulator between the panels and the heater. Heater without its own regulator, powered by DC current.
I would use a solar heater like a pool heater (black pipes sitting in sunlight) and a small solar panel powered recirculation pump to move the water through the pipes. Seems like direct sun heating would be more effecient!
The PV watt calculator is not very good. The location is very inaccurate.
Check my latest video: what can a 100W solar panel run where I check the accuracy of the tool PV watts.
Batteries are expensive and as you will get at least a little sunshine even on a cloudy day, I would recommend oversizing the solar system and going for a smaller battery size. From an economic standpoint, the depreciation on batteries is just too much compared to the cost of adding extra solar. It also depends on what is available: this equipement comes in specific sizes, you have to make the calculations with the panels, inverter and batteries that your potential supplier has available. If he has a 4 kWh battery, use ~3 kW panels, if he has 5 kWh, then ~2 kW should be enough.
Getting second-hand solar panels is also a great way of saving money.
I've been trying to find a good deal on solar panels but no luck beyond Amazon. Since I live in Canada I need to run a generator periodically to fill up after weeks of overcast 😅
Lithium. 100lbs per 100sqft of house.
That's a very inaccurate way to size a system. What might work for you doesn't work for everybody.
@cleversolarpower You might be right. I'm a Biochemist and see things differently. To reduce the stress on any battery system, you attach it to a load that can't overheat.
Struggling to understand how 2 represents 50% usage capacity and 1.25 is efficiency of 80%
50% is half, so if you multiply by 2 you have double the other way around. 1/0.8=1.25
100w fridge huh?
Yes. Remember i live in Europe where this is very normal.
Did anyone get the error in the last section of the video ?
He confused solar radiation with number of sunny hours a day !
No ! Solar radiation (in kWh/m²/day) accounts for the amount of sun energy capted by a unit of surface.
So, the calculations would be :
* For lead-acid
6 112 Wh = 6.112 kWh
6.112 kWh divided by 3.47 kWh/m² = 1.76 m²
That's almost one ordinary solar panel
* For lithium
4 938 Wh = 4.938 kWh
4.938 kWh divided by 3.47 kWh/m² = 1.42 m²
Could you plese confirm/correct ?
Using ChatGPT:
*Question:
Does a solar radiation of 5 kWh/m²/day mean that on average we have 5 hours of sun in a day ?!
*Answer:
No, a solar radiation of 5 kWh/m²/day does not necessarily mean that there are 5 hours of sunlight in a day.
Solar radiation, typically expressed in kilowatt-hours per square meter per day (kWh/m²/day), refers to the total amount of solar energy received on a horizontal surface over the course of a day. It is a measure of the intensity of sunlight reaching the Earth's surface.
The value of 5 kWh/m²/day indicates the total energy received from sunlight over the entire day, regardless of the duration of sunlight exposure. This value can vary depending on factors such as location, time of year, weather conditions, and atmospheric factors.
In regions with longer daylight hours, the same amount of solar radiation may be spread over a longer period of time, resulting in lower intensity but longer duration of sunlight exposure. Conversely, in regions with shorter daylight hours, the same amount of solar radiation may be concentrated into a shorter period of time, resulting in higher intensity but shorter duration of sunlight exposure.
Therefore, the solar radiation value of 5 kWh/m²/day does not directly correlate to the number of hours of sunlight in a day. It represents the total energy available from sunlight over the entire day, and the actual duration of sunlight exposure can vary depending on local conditions.
Otherwise, that's an excellent video ! Thanks !
No, sunhours equals kW/m²/day. Solar panels at STC are rated at 1kW/m² at 25°C. Don't confuse sunhours with actual hours of sun per day. It could be that one day has 6 hours of sun at 500W/m². This is equal to 3 sunhours. Because 1 sunhour is 1000W/m².
Am also confused
What are you confused with? Send me an email for info.
80% = 1,20 not 1,25 ;)
100/1.25=80
Not accurate by the way
Where from this bogus battery sizing formula that can kill customers😹💔😹
?