BATTERY BACKUP CALCULATOR
What must keep running
when the grid stops?
Select your essential equipment and desired backup time. Get an initial estimate for lithium battery capacity, inverter power and solar recharge capacity.Choose equipment → Set usage → View estimate → Get validation
What are you planning?
Choose one option so the calculator asks only the questions relevant to you.
Hybrid system calculationBackup equipment determines battery capacity. Additional daytime equipment determines the hybrid inverter requirement.Jump to daytime equipment ↓
STEP 2
5 selectedSelect equipment needed during a power cut
Start with a preset or create your own selection. Then adjust quantities and expected backup hours.
Quick startA typical example is selected. Please review it.
5 selected5.5 kWh battery · View results ↓UseEquipmentWattsQtyHoursEnergy
Essentials
LED lights10 W indicative · Standard load6 selected · 5 backup hours0.30 kWh
Ceiling fans75 W indicative · Standard load3 selected · 6 backup hours1.35 kWh
Wi-Fi router15 W indicative · Standard load1 selected · 8 backup hours0.12 kWh
Refrigerator180 W indicative · Higher starting power1 selected · 8 backup hours1.44 kWh
Work and electronics
Television120 W indicative · Standard load1 selected · 4 backup hours0.48 kWh
Laptop65 W indicative · Standard load0.00 kWh
Desktop computer250 W indicative · Standard load0.00 kWh
Kitchen and utility
Washing machine500 W indicative · Higher starting power0.00 kWh
Microwave1200 W indicative · Standard load0.00 kWh
Motors and air conditioning
Water pump750 W indicative · Higher starting power0.00 kWh
1-ton inverter AC1100 W indicative · Higher starting power0.00 kWh
1.5-ton inverter AC1600 W indicative · Higher starting power0.00 kWh
Other equipment
0.00 kWh
What else may run while solar is available?
Add equipment that may run in daylight but does not need battery backup. Hours are not required because this step sizes maximum inverter demand.
Select only equipment you own and expect to use together. Ekam Energy will validate appliance ratings, starting power and your electrical connection.
HOW TO READ YOUR RESULT
Battery capacity and inverter power
solve different problems.
How long equipment can run
Energy use accumulates over time. Running a 100-watt load for five hours requires 0.5 kWh before conversion losses and operating margin.
How much can run at once
The inverter must carry simultaneous running loads and tolerate short starting surges from motors such as pumps, refrigerators and air conditioners.
Why the final design may change
Actual nameplate ratings, phases, power factor, surge behaviour, battery discharge limits, temperature and future expansion all affect equipment selection.
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