LED Bulb
W each
0
Load Calculator for smarter battery sizing
Pick the appliances you want to run, choose the backup hours you need, and we’ll recommend the right Premex battery and how many you need.
System voltage
Appliances
Build your load profile
Choose how many of each appliance you use. You can change the wattage of any appliance to match yours, and add any custom appliance that is missing.
Ceiling Fan
W each
0
Television
W each
0
Wi-Fi Router
W each
0
Refrigerator
W each
0
Air Conditioner
W each
0
Desktop PC
W each
0
CCTV + DVR
W each
0
Backup runtime
Adjust how long the connected load should run.
1 hour
1h6h12h
Summary
Sizing estimate
Connected load
0W
Backup runtime
1 hour
System voltage
12V
Selected appliances
No appliances selected yet.
Note on intermittent appliances: Not everything listed runs continuously. A water pump is typically used for 10–15 minutes at a time, and a mixer grinder for just a few minutes per use — not for your full backup duration. For these, consider counting only the realistic minutes of use rather than the full backup window, or your recommended battery size may be larger than you actually need.
Recommended batteries
The right Premex battery for your load
Sized with a 20% reserve margin and 90% usable capacity.
Add at least one appliance to see which battery, and how many, you need.