How to Calculate Inverter Sizing & Battery Bank

Calculation Of battery and inverter

As we Know, Battery Calculations and Inverter Sizing are shown different & complicated to understand everywhere. Here, we will make you understand the easiest way to Study battery Calculations & Inverter Sizing. This is the easiest way to Check & learn your Home inverter Sizing & battery Calculations.

Load details

Sr No.EquipmentWattQuantityTotal
1Fan604240
2Led10660
3Tv70170
4Desktop1501150
5cooler2501250
     
Connected Load  770

Total connected  load = 770 watt

we convert in VA then divided by power factor

Power factor = 0.8

Total load in terms of VA= Watt/0.8=770/0.8=962.5

Size of inverter = Total load(VA)*(1+additional Load )/ Efficiency of inverter

Total load(VA) = Total connected load

Additional load = we assumed the connect 20% of  extra load any time

Efficiency of inverter = Input from grid power output from battery efficiency of inverter depends on manufacturer and models of inverter.Its mainly 80% To 95 % . we take here 80 % efficiency of inverter

Size of inverter= 962.5X(1+20%)/80%

                           =962.5X1.2/.8

                           =1443.75VA

We take here inverter size more than calculated value so we choose here 1500VA Inverter .if 1500VA inverter not available in market you can also consider 1600 or 1700 VA Inverters

Now we calculate size of battery

Formula =Load * backup hour(1+Total loses)*(1+battery aging factor)*Temperature factor/ Efficiency of battery* depth of discharge(DOD)

Load = Connected load (Watt)

Backup Hour = how many hours you run your appliances on battery Without Main supply we consider here 3 hours

Total losses = we consider total 5% losses in our System

Battery aging factor = generally 20 % of battery Aging factor we consider

Temperature correction factor = Its very on temperature of room we consider here temp. Of room is 50 degree C so temperature correction factor is 1

Efficiency of battery = its depend on manufacture and models of battery. we consider here lead acid battery having 90% efficiency

Depth of discharge (DOD)=Depth of Discharge is defined as the capacity that is discharged from a fully charged battery, divided by battery nominal capacity. Depth of discharge is normally expressed as a percentage. Its around we considerd 80%

Formula = Load * backup hour(1+Total loses)*(1+battery aging factor)*Temperature factor/

Efficiency of battery* depth of discharge(DOD)

              = 770X3*(1+5%)*(1+20%)*1 / 90%*80%

               =   770*3*1.05*1.2*1 / 0.9*0.8

                  =   2910.6 / 0.72

                  = 4042.5 Amp/hour

So we need 4042.5Amp/Hour for entire load for run 3 hours

Now we calculate battery sizing  

Firstly main thing for battery sizing calculation is our nominal system voltage .

Nominal System Voltage = Nominal System Voltage is that voltage on which our system is working. Its clearly mention on inverter. When we purchase inverter, we should always ask voltage of inverter. Mainly Nominal system voltage in multiplication of 12 like 12V , 24V , 48V

We calculate here for both

Case I

Consider system voltage 12 V

Battery Ah = total required Ah/System voltage

                    =4042/12

                     =336.8

                      =336Ah

We can also round off this, for better calculation

So we consider here 300 Ah

Note1-

In series Connection- Voltage is added and current will remain same

In parallel connection – current will add and voltage will remain same

Note2- Our calculation based on 12 v battery  

No of battery = total Ah required / Ah of single battery

 Case1

 Select 150 Ah Battery

  No Of battery 150Ah required       =  300Ah/150Ah

                       = 2

No of battery connected in series =system voltage/battery voltage

                             =  12/12

                             =1

No of battery connected in Parallel  =total no of battery / total battery connected in series

                                  =2/1

                            =2

12 V 150 Ah Battery Connection in parallel

Case 2

If we select 100Ah battery

  Total no of 100Ah battery  required     =  300Ah/100Ah

                         = 3

No of battery connected in series = system voltage/battery voltage

                             =  12/12

                            =1

No of battery connected in Parallel  =total no of batteries / total batteries connected in series

                                  =3/1

                                   =3

12 V 100 Ah Battery Connection in parallel

Case II

Consider system voltage 24 V

Battery Ah = total required Ah/System voltage

                    =4042/24

                     =168.41

                      =168Ah

We can also round off this for better calculation

So we consider here 150 Ah

Note– our calculation based on 12 V battery  

 Case1

 Select 150 Ah Battery

No of battery = total Ah required  / Ah of single battery

                       =  300Ah/150Ah

                       = 2

No of battery connected in series =system voltage/battery voltage

                             =  24/12

                            =2

No of battery connected in Parallel  =total no of battery / total battery connect in series

                                  =2/2

                             =1

12 V 150 Ah battery connection in series

Case 2

 Select 100 Ah Battery

Total No of 100 Ah Battery           =  300Ah/150Ah

                       = 3

No of batteries connected in series =system voltage/battery voltage

                             =  24/12

                            =2

No of batteries connected in Parallel  =total no of battery / total battery connected  in series

                                  =3/2

                            =1.5

Note- we cannot connect three battery in series – parallel connection So we can go with lower size of battery

Case2

 Select 75 Ah Battery

Total No of 100 Ah Battery    =  300Ah/75Ah

                       = 4

No of battery connected in series =system voltage/battery voltage

                             =  24/12

                           =2

No of battery connected in Parallel  =total no of battery / total battery connect in series

                                  =4/2

                                =2

Summery

Total Electrical Load=770 Watt

Total Electrical Load=962.5VA

Size of Inverter= 1500VA  

Size of Battery Bank= 300 Amp/Hr

For 12 Volt system

For 150 Ah , 12V DC Battery : Parallel  Connection & 2 No’s of Battery

For  24 V system

For 150 Ah , 12V DC Battery : Series & 2 No’s of Battery

For 75 Ah , 12 V DC Battery :  Series parallel Connection & 4 No’s of Battery

If you want to know more about On-Grid/ off-grid Solar powerplants Installation in detail then Contact GOYAL SOLAR Or PRAGATI SUNENERGY SOLUTION .

contact details

GOYAL SOLAR

Chetan Goyal -8956567722

email- [email protected]

web- www.goyalsolar.com

PRAGATI SUNENERGY SOLUTION

Ramesh Jaiswal – 7982243342

email- [email protected]

web – www.pragatisolar.in

if you want to Purchase solar related products like Home lighting Systems, Solar Garden lights , Solar motion Sensor Lights, Solar Inverter, Solar Panels, all Solar BOS Items then Contact us.

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Writer : Ramesh Jaiswal

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