In this post we will discuss the calculation of following items for installation of solar invertor System in your Home.
1. Battery (AH) required for your Home Solar system?
2. How to calculate Backup time of Your installed battery?
3. Solar Panels Required for Your home Load and Battery Charging?
Calculation of Battery (AH) required for your Home Solar system
For Calculation of battery we must know the Total load and Total time of load On condition.
lets consider our home load is 300W and we want to use it for 6 Hrs then the required battery rating will
Battery = (Total Load) X (Backuptime in Hrs) / Battery V (12V)*
*We using 12V dc battery
Battery = (300W) X (6 Hrs) / (12V) = 150AH
Calculation of Backup time of Battery
As we know from the previous topic the Formulae of Backup Time Calculation is
Backup time in Hrs = Battery Size (AH) / Total Current Draw by Load
= 150AH / 40 A = 3.75Hrs = 3 Hrs 45 Min
=.75 x 60 = 45 Min
How we will Calculate Total Current
Total Current = Home Load Current + Battery Charging Current
Home Load Current = Total Load / Voltage of battery (12V)
= 300W/12 = 25A
Battery Charging is 10 time less than its total size for slow charging which is:
= 150/10 = 15 A
Then Total Current Will = 25 + 15 = 40 A
Solar Panel Required for Load and Battery Charging
Solar Panel W = Closed Circuit Voltage x Total Current = 14 x 40 = 560 W
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