How To Get The Size Of Inverter Batteries
From Odusina Adewale Hiworks
If an inverter is needed to support certain load when public power or generator fails, batteries are needed to store electrical energy for such period.
The size of such inverter can be calculated by simply adding all the power capacities of the appliances together and multiplying that by a factor of simultaneity which anticipates that not all the connected appliances will be in use at at times; at some points, some light will be switched off, some TVs will be turned off, your refrigerator, air-conditioning systems will automatically go on ad off to regulate temperature,
Batteries as some of us have observed are rated in AH implying AMP HOUR. AMP is current capacity and hour implies time.
Hence a 100AH Battery will automatically run 100A current for 1hour. It also means it could run 50A for 2hours and will run 10A for 10A. You will observe all the various deployments still equals 100AH.
To now get your required battery capacity, practically, you need to profile how you use individual appliances.
Say, TV rated100W (locate info at the back or on the side of your appliances) is used for 10hours = 100x10WH, and your 10nos light points rated 20W are used for 5hours = 10x20x5 WH and your 5nos standing fans rated 50W each are used for 10hours =5x50x10 WH.
Total WATTHOUR = 1000+1000+2500WH =4500WH
NOTE THAT BATTERIES ARE RATED IN AH
Now you need to know the profile of your inverter. Inverter is not a generator. Inverter simply converts Direct Current Supply to Alternating Current Supply just like Transformer converts High Tensions to Low Voltage.
Different inverters have various Dc voltage they work with; 12, 24,48,92,120, 192Volts etc
Inverter also have rated power capacity. For the above example, we shall assume simultaneity to be 60%. This implies I need inverter size that can support all the above mentioned load TV-100+LIGHTS-200+FANS-250 =550W x 60% = 330W.
Recommended inverter size shall be 500W. you however need to read the input voltage value for the plate attached to the inverter.
By dividing the input voltage V input by the total WattHour being 4500WH, you will have your AH value.
Hence for V =12V, AH is 4500/12 = 375AH
For V =24V, AH is 4500/24= 188AH
For V =48V, AH is 4500/48 = 94AH
it also implies, that as V increases, more batteries will be added.
Most common inverter battery is the 200AH 12V Batteries. Let me spare you other classifications.
It then implies that 2 batteries shall be required irrespective of which inverter profile is used.
Note that the higher the input voltage the smaller the AH.
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