Originally Posted by
Brian Elfert
I couldn't even imagine the cost of three days of backup power for my house with batteries. I use around 10 KWh per day of usage that is not from the sun. The 36Kwh setup from Generac appears to cost around $30,000.
If my spreadsheet is right, we use on average 108 kWh per day. Ah, welcome to sunny Florida. I can't imagine the cost of 3 days of battery backup. Although, we did have the breakers switched on the panels so that only one panel was needed during a power outage. Living in hurricane country for the last 25 years, you realize that what you need to survive without power after a hurricane is one room of HVAC, a working refrigerator and freezer combo, a working rangetop, and lights for that area.
In my house that would involve one floor of power. So lets say 54kWh per day. If it was sunny after the hurricane (which usually happens), and the solar panels produce about approximately 114 kWh during sunlight, that should easily be able to recharge the batteries and power the house all day (unless we start using stupid amounts of energy). But it's really about nighttime energy usage. And if its rainy/cloudy even more battery capacity would be needed.
So a minimum of 50kWh of storage, likely 100kWh. I can't even imagine, if possible, what that would cost.
Last edited by Alan Lightstone; 01-26-2022 at 10:18 AM.
- After I ask a stranger if I can pet their dog and they say yes, I like to respond, "I'll keep that in mind" and walk off
- It's above my pay grade. Mongo only pawn in game of life.