How to Calculate Inverter Power Rating and Inverter Battery Backup Time!

Welcome to Sona Solar Zimbabwe - Your One-Stop Shop for Affordable, Top-Tier Solar Solutions.

Sona Solar Zimbabwe Is Customer Centric. We offer a Comprehensive One-Stop-Shop experience and Bridge The Huge Gap Between Getting The Best, Quality Products and Getting it at an Affordable Price.

Feel free Call us or WhatsApp us on +263 78 922 2847 and +263 78 864 2437.

Inverter systems are a common feature in our homes and workplace where they play a prominent role in the ensuring uninterruptible power to sensitive loads and devices.

For home applications, there is the need to adequately size your inverter to be able to meet the expected load demand.

Inverters convert DC voltage to AC voltage. They have a battery system which provide adequate backup time to provide continuous power in the home. The inverter system then converts the battery voltage to AC voltage through electronic circuitry. The inverter system also has some charging system that charges the battery during utility power. 
How to Calculate Inverter Power Rating and Inverter Battery Backup Time!
How to Calculate Inverter Power Rating and Inverter Battery Backup Time!
During utility power, the battery of the inverter is charged and at the same time power is supplied to the loads in the house. 

When utility power fails, the battery system begins to supply power via the inverter to the loads in the home as shown below:

How to Size and Calculate the Inverter Power Requirement:

Inverter Power is rated in VA or KVA.

Power in VA = AC Voltage x AC Current in Amps.
Power in KVA = AC Voltage x AC Current in Amps/1000.
Power in Watts = AC Voltage x AC Current in Amps x PF.
Where PF = Power Factor.
Power in KW = AC Voltage x AC Current in Amps x PF/1000.
Also Power in W = Power in VA x PF.
Power in KW = Power in KVA x PF.

Suppose we want to size an inverter to carry the following loads:

1. Lighting load, 300W.
2. 3 Standing fans of 70W, each.
3. 2 LCD TV, 100W.
4. 1 Home Theatre Music System, 200W.
5. 1 Juice extractor, 150W.

Applying Power in KW = Power in KVA x PF.

Power in KVA = Power in KW/PF = Power in KW/0.8 (Nominal PF = 0.8, which is standard for homes)

Total load in Watts = 300 + (3 x 70) + 200 + 200 + 150 = 1060W = 1.06KW
Power in KVA = 1.06/0.8 = 1.325
An inverter of standard rating 1.5KVA is required to carry the loads above.

How to Calculate Inverter Battery Backup Time

The backup time for batteries in an inverter system depends on the number of batteries as well as their capacity in Amp-hours.

Inverter battery backup time is calculated as:

Back up time = Battery Power in Watt hour (Wh)/Connected Load in Watts (W).
Battery Power in Wh = Battery Capacity in AH x Battery Voltage (V) x Number of Batteries.

Let us shorten the formula by using the following Symbols:

Let BUT = battery backup time in hours
C = battery capacity in AH
V = battery voltage in volts
N = Number of batteries in series or parallel as the case may be.
PL = connected load in watts (W)



In our example above, suppose we have selected a 24V, 1.5KVA inverter system that is to use two 12V batteries in series connection and suppose further that the capacity of our batteries are 200AH each, then:

C = 200AH
V = 12V
N = 2
PL = 1,060W

We Are Sona Solar Zimbabwe.

Named after the Gaelic term (Old Irish Word) Sonas - for Good Fortune (Prosperity and Happiness) - Sona Solar Zimbabwe is committed to bringing Prosperity and Happiness to its customers through Solar Solutions in Zimbabwe. We deliver turn-key energy efficient solutions to meet client energy and budgetary needs and reduce environmental impact.

Choosing The Best Solar Company in Zimbabwe:

Choosing a solar panel installation company can be time-consuming. It is easy to be overwhelmed when comparing the reputation, price, warranty, and panel options of different solar providers.

Sona Solar Zimbabwe
stands out as one of the most reputable companies in Zimbabwe.
Sona Solar Zimbabwe offers reliable systems with a 25-year warranty, 10-year workmanship warranty, and two-year production guarantee.

Sona Solar Zimbabwe prides itself on offering original solar products and accessories. Sona Solar Zimbabwe also maintains partnerships with reputable brands around the world.

Address: 7 Frank Johnson Ave, Eastlea (Near VID), Harare, Zimbabwe.

WhatsApp: +263 78 922 2847 and +263 78 864 2437
Landline: +263 24 2797750

Sona Solar Zimbabwe Online
Sona Solar Zimbabwe Are Specialists In Solar. We Offer A Wide Range Of Products Solar Inverter, Batteries, Panels and Solar Installations In Zimbabwe. Sona Solar Sales
Chat with WhatsApp