When more power starts coming and going, we plan to install an inverter battery, but it is a bit difficult to calculate how many kW of the inverter battery should be. Many questions come to mind, the solution of this has been given here.
Step 1: Home Load
Inverter batteries are a limited power backup solution so it is important to know our power consumption. More information is given here to know Power Consumption.
For example, if there are 3 BHK homes where continuous power consumption is up to 400 watts.
Step 2: Backup Time
The backup time is estimated according to the power cut of your area. The duration of power cut in India is more than 2 hours. This power cut is a frequent power cut like 5 min, 10 min, 15 min, 20 min, etc.
For example, if you are searching for an inverter battery solution for residential areas in urban, semi-urban and rural areas where the power cut duration is not more than 2 hrs.
Inverter and Battery Capacity = Home Load * Backup Time
= 400 Watt * 2 Hrs.
= 800 Watt
Here, backup time will vary depending on localities. On the basis of various applications, we have simplify inverter and battery capacity calculation:
| Power Consumption | Inverter Battery Capacity |
| 400W | Inverter – 1kVA (12V), Battery - 80Ah – 200Ah Battery * 1 |
| 1000W | Inverter – 2.5VA (24V), Battery – 80Ah – 200Ah Battery * 2 |
| 2000W | Inverter – 3kVA (48V), Battery – 80Ah – 200Ah Battery * 4 |
| 4500W | Inverter – 5kVA (48V), Battery – 80Ah – 200Ah Battery * 4 or CAML10048 Lithium Battery * 1 |
Note:
- Efficiency of Inverter – Normal inverter / solar inverter has 80-95% efficiency and high frequency string inverter has 100% efficiency.
- Efficiency of Battery – Lead Acid battery has 75% efficiency and lithium battery has 98% efficiency.
