An essential-load list makes a battery recommendation much more accurate than a monthly electricity bill alone. Begin with the circuits that must continue during an outage, then record their power and operating time.
Separate continuous and intermittent loads
Internet equipment may run continuously, while refrigeration cycles on and off. Record measured daily energy where available. Multiplying a compressor’s nameplate watts by 24 hours can overstate typical use; ignoring starting demand can understate required inverter power.
Use a simple worksheet
For each appliance, record running watts, expected hours, starting demand and priority. Add watts multiplied by hours to calculate daily Wh, then divide by 1,000 for kWh. Keep any unmeasured estimate clearly labelled.
Choose a load-shedding rule
Decide which loads can be turned off as SOC falls. A separate essential-load panel or approved control strategy can preserve energy for critical circuits. An installer must confirm circuit separation and the backup transfer arrangement.
What to record before selecting a battery
- Refrigeration and communications
- Lighting and essential sockets
- Pumps with starting demand
- Loads deliberately excluded from backup
Should the battery cover the monthly average?
For backup, size around the loads and hours required during an outage. Monthly consumption also includes loads that may not be necessary in backup mode.
Compare the relevant battery
Review the corresponding Graspmart battery specifications alongside the capacity comparison. The product page gives the reference electrical platform; the quotation confirms the supplied model and configuration.
For a useful recommendation, include your delivery country, inverter model, supported loads, backup hours and quantity in the project enquiry. This allows energy, power and installation requirements to be checked together.
