Whole-House vs Essential-Load Backup Power
Decide whether to back up an entire home or only critical circuits during an outage.
Essential-load backup
This approach powers selected circuits or devices such as refrigeration, lighting, internet, pumps and communications. It can reduce required system size and cost.
Whole-house backup
A larger system aims to support most normal household functions. Peak loads such as air conditioning, electric heat, water heating and cooking can dramatically increase required capacity.
Load management
Automatic or manual load shedding can keep a smaller system from being overwhelmed by nonessential high-power devices.
Which is more resilient?
A carefully chosen essential-load system can be more practical than an undersized “whole-house” system because it focuses limited energy on priority needs.
Plan before buying
Make a circuit and appliance inventory, identify starting surges, and decide which loads can be deferred during an outage.