When it comes to backup power solutions whether it’s solar + battery storage, a generator, or a hybrid system choosing between whole home backup and partial home backup depends on how much of your home you want to power during an outage. Your decision will be influenced by factors like budget, power needs, and the level of comfort you expect when the grid goes down.
A whole home backup system ensures that all electrical loads in your home continue running during a power outage. This is typically achieved by installing a Microgrid Interconnect Device (MID) between the electric meter and the Main Service Panel (MSP). The MID redirects power from the grid to the backup system, supporting the entire MSP.
In homes with an All-In-One Panel (where the meter, main breaker, and load breakers are in one unit), all circuits must be transferred into a new dedicated Backup Load Panel. Unlike partial home backup systems that only support selected circuits, whole home backup ensures no load is left unpowered.
• Comprehensive coverage: Everything in your house remains operational.
• Convenience: No need to manually switch circuits or appliances on and off.
• Full home continuity: Your HVAC system, entertainment setup, and all appliances continue running.
• Increased property value: Homes with backup power are attractive to buyers, especially in areas prone to outages.
• Scalability: You can expand your backup system over time with additional battery storage.
• Higher cost: Installation and maintenance are expensive due to the need for larger batteries and a bigger inverter.
• Larger energy storage requirements: Keeping everything powered for days requires substantial (and costly) storage capacity.
• More maintenance: A bigger system means more components to monitor, including batteries and inverters.
A partial home backup system powers only selected circuits during an outage instead of the entire home. This setup involves installing a Backup Load Panel (BLP), which moves essential circuits from the Main Service Panel (MSP) to the backup system.
Typically, a partial backup system prioritizes critical loads such as:
• Refrigerator
• Microwave
• Lighting
• Critical outlets
• Furnace blower (for gas heating systems)
The system is usually powered by a smaller generator or battery-based inverter, configured to support only these essential loads.
• Lower cost: Since it powers fewer circuits, installation and maintenance costs are lower.
• Simpler installation: Fewer circuits mean an easier and quicker setup.
• Flexibility: Choose which systems or appliances are most important to keep running.
• Smaller storage needs: Requires less battery storage or a smaller generator, saving space and money.
• Efficiency: More effective for short-term outages since it focuses on essential devices.
• Limited power: Only selected appliances stay on, so you may lack full comfort during an outage.
• Manual switching: Some setups require manual control of power distribution, though Automatic Transfer Switches (ATS) can help.
• Load management: You may need to decide between running different appliances simultaneously (e.g., fridge vs. water heater).
• You want full comfort and convenience with no compromises during outages.
• Your home has high power needs, such as running medical equipment, multiple fridges, or HVAC systems.
• You live in an area with frequent or long-lasting power outages.
• You’re looking for a long-term investment that increases property value.
• You only need to keep essential devices running, such as the fridge, lights, and a few appliances.
• You have a tighter budget and are willing to sacrifice some comfort during an outage.
• You live in an area where outages are rare or brief.
• You prefer a simpler, more affordable solution.
Ultimately, the choice between whole home and partial home backup depends on your power requirements, budget, and the level of comfort you expect when the lights go out. No matter which option you choose, both provide peace of mind by ensuring your home remains powered when the grid fails. Still not sure what is the best choice for you? seek help from an experienced consultant who can analyze your needs and provide a tailored solution.
