Cybergirl
Well-known member
- Joined
- Jul 3, 2020
- Threads
- 40
- Messages
- 873
- Reaction score
- 2,936
- Location
- Illinois and Arizona
- Vehicles
- Tesla Model Y LR, Model Y SR, Cybertruck AWD FS
For me, critical loads are:How does a 9.6kWH battery power critical loads for 24 hours?
1) Refrigerator and freezer
2) Lights in every room (selectively turned on)
3) Internet (modem, router)
4) Room outlets (selectively used)
5) Gas furnace
In summer my solar panels will typically produce 20 to 30 kWh each day. If the grid is down and the sun is shining, there's plenty of solar power during the day to supply my needs. Excess solar is exported to the grid and taken back a night to charge my Tesla and run the A/C. My monthly electric bill is $0.00 in spring, summer and fall.
In a blackout, the problem is having power overnight. The house battery is sized to handle overnight power consumption for those critical load circuits. Overnight power consumption from the protected loads panel typically drops to ~500W or less. A fully charged 9.6 kWh battery will easily last 12+ hours until solar output resumes, and the battery is recharged. Here's the system:
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