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Most-Common Configurations For Solar + Storage
- Whole Home Backup: aka “ Power Around the Clock”
- Requires multiple batteries, likely 25 kWh or more, and will back up all loads for a homeowner in the event of a power outage. The amount of time the backup power will last depends on the homeowner's usage during an outage, specifically with large loads like an AC.
- Partial Backup (Circuit Preference)
- Moderate backup for designated loads, often for appliances that the homeowner deems essential, during an outage that can either carry minimal loads for a longer period or include moderate loads for a short period. Likely requires 10kWh or more.
- Self-Consumption Only (Rate Arbitrage)
- Designed for reducing power bill costs via NEM 3.0 through behind-the-meter usage, this is generally the least expensive type of battery setup, but it’s important to note that this will not provide any backup if the power goes out.
Note that all of these configurations are expected outcomes after you’ve discussed them with the homeowner and sized the system using appropriate tools. Be clear with the homeowner that, if they change any of their energy usage habits post-install (just like with solar), then the benefit they receive from the system is likely to shift.
Single-battery systems cannot support air conditioning. In addition, compatibility with electric vehicle chargers, water heaters, dishwashers, pool pumps, well pumps, ovens, and dryers is subject to manufacturer specifications. A desire to use multiple large electrical loads at the same time will likely require additional batteries. It is not recommended to back up air conditioning units because of their high electrical power draw.