gtech2sure:


Let me quickly brief you on this. I am not an installer though but a fresh graduate who understand basic Electronics, Electrical and Computer Engineering all together. I had solved solar system problems for few installers who got lost for proper choice of components used and calculations. This calculations pretty work well


I am going to show you simple calculation to know like how many solar panel you need, watt of inverter to use, battery, charge controller and time to get a full charge using calculation.


Mind you, the calculation aren't hard. We only need addition, subtraction, multiplication and division.

Now let's begin
Before i proceed, there are some calculations i will not include in order not to make everything complicate, the calculations are based on energy loss in solar inverter system. With the one i will drop here, you can become an installer overnight with the help of youtube for practical aspect.

This system will be designed in 24v


LOAD: 700 watt

INVETER:
Inverter should be greater 25% than the total Load


Therefore load = 700 watt


700 x (25/100) = 175
700 + 175 = 875 Watt
This is the rating of needed inverter. But go for 24V, 1000 watt inverter or higher


BATTERY:
To know the total battery that could power load of 700 watt for 8 hours, just mutiply total load with time.
ie 700w x 8 = 5600w
This shows you need battery that could generate 5600 watt of power for 8 hours.


Use this formula to convert AH of the battery to watts.


W = V x AH. where w= watts, v= battery voltage and AH = battery amps.


Therefore: 12v x 200ah = 2400watt


Mind you, the system design is 24v
Due to this, you are going to use six 12v, 200ah battery where the three steps battery will be connected in series while loop them together in parallel to give you 24v, 7200 watt.


I know you might be wondering that the watt of battery we got here is more than what we need, just don't worry it's an added advantage. Our 7200watt battery here could power load of 700w for 10 hours.


It's done in this way:
battery watt/load: 7200/700 = 10.2 hours


SOLAR PANEL
To get solar power rating to use and time to get your battery charged depends on choice but i recommend 6 hours charging time because of cost.


It goes this way
Time to charge: battery watt/time (hour)
= 7200/6 = 1200watt
Your battery will get full in 6 hours with solar panel of 1200wat.


Note: You must not put ON any load on the system for you to get full charged within the period of 6 hours. But if you can't abide with this, you have to budget extra 700 watts solar panel to your cost


VOLTAGE CONTROLLER OR REGULATOR:
Power rating of solar used to determines the power of regulator to use.


Note: That Regulator rating are usually in Amps which you would need to convert to watt.


The regulator can be gotten using this formula
A = Solar rating (watt) / Battery voltage
= 1200 watts / 24
= 50 Amp


Therefore, you need 50A, 24V charge controller.


In summary this is all you need
24,V 1000watt inverter
Six 12V, 200AH battery
1200watt solar panel
24V, 50amp charge controller.


Goodluck..

Malevonent:


yes, i equalize, about once a month, i checked the cells randomly, they are varying btw green and white, ie ok and fair

BetaTechnicians:
Oh... nice. How are they faring?

juliustip:
I have 130w x4 12v Solar Panel with Mercury 200A 12v battery.
I need a charge controller with bluetooth data recommendation and perhaps a 2 - 3KVA inverter recommendation too.

If you have, kindly quote me with name and price

adrusa:


There are some basic assumptions here that will cause serious problem.
1. I didn't see depth of discharge (DoD) here. For lead-acid battery, you don't have all the capacity available, may be about 50% at best. Some may say 80%, but depending on your load and your cut-out voltage, your inverter will cut off well before you can get to 80% of DoD. So, in calculating your AH need, you must double the result from your calculation. If you need 200AH, get 400AH.
2. I also didn't see "efficiency factors" here. In moving from DC to AC in an inverter, some power will be lost. It is usual to give about 10% of your power to this loss. Also, solar panels also have efficiency factor. This must also be taken into consideration. A 1KW array will not give you 1KW in an hour, it will be less. In addition, the sun is not likely to be full blast for full 5 hours in a day. So, some power will also be lost during cloud passes. Finally, batteries don't convert all available energy to storage during charging. Some of the energy are lost as heat. So, in making this kind of calculations, there is a need to make allowances for these imperfections in electronics.

ojeysky:


Interested in this as well, though found a qasa wall fan that claims to be energy saving.... ordered waiting delivery.

JUO:
is called smart boost on my inverter

quest4s:
service assistance light showing on luminous inverter. What does it mean?

NoMoreTrolling:


He doesn't need to double the ah calculation because the OP said he is using Lithium batteries not Lead Acid.

Lithium batteries are a whole different ball game.

mctfopt:
If you are still undecided here is a piece of advice, going lithium from lead acid battery is like upgrading from a horse ride to an electric vehicle.

adrusa:


That's right to some degree, but even then he still need to add a little more unless he plans 100% DoD which is not recommended even for Lithium.

ojeysky:


It's like you just experienced some new stuff about lithium.....was charging my battery was charging as 48A yesterday with a smile. Lifepo4 is cool, even if what I get from it is 5 years considering the performance I am getting I will still be fulfilled.
Planning a DYI Lifepo4 soon to increase my battery bank capacity.

mctfopt:



That is one of the advantages, the ability to charge at supersonic speed and high current without fear of damage to the batteries. Lithium is just the future.

adrusa:


So, when are we going to see serious local dealers? Buying from China is a logistic nightmare.

ojeysky:


It's like you just experienced some new stuff about lithium.....was charging my battery was charging as 48A yesterday with a smile. Lifepo4 is cool, even if what I get from it is 5 years considering the performance I am getting I will still be fulfilled.
Planning a DYI Lifepo4 soon to increase my battery bank capacity.

adrusa:


So, when are we going to see serious local dealers? Buying from China is a logistic nightmare.

NiyiOmoIyunade:
We full ground o!

PylonTech and BYD only for now though.

As other brands pass our field tests, we will add them on.

The idea is for the customer to enjoy his investment with peace of mind.

quest4s:
service assistance light showing on luminous inverter. What does it mean?

BetaTechnicians:

Do you have any reputable seller you can recommend in China? Maybe I should test a small unit before thinking of an overhaul.

adrusa:


So, when are we going to see serious local dealers? Buying from China is a logistic nightmare.

mctfopt:



www.nairaland.com/attachments/11175069_screenshot202003091023552_jpeg8c40e91aef301905344e00ea1aeccc68

This guy is good too, I know someone who bought from him and there's no complaint till date, ojesky can also testify too

ceaser:


Link for the QASA wall fan, please

ojeysky:


Read good reviews about this one: NGN 620,152.16 | 2019 NEW 16PCS 3.2V 150Ah Lithium Iron Phosphate Cell lifepo4 battery solar 24V300AH 48V150Ah cells not 120Ah EU US TAX FREE
https://s.click.aliexpress.com/e/_dWKeGAJ