Which Circuits Should I Backup?
You may also ask “Do I have to backup?”. No, you don’t, but the cost is minimal and is around $1,500 in most cases. This is a small cost for such a huge benefit.
We hear this a lot: “I want to backup my whole house”. If you have the capital and this is your dream, we can do this for you. However, in most cases, a single LG Chem RESU10 or Tesla Powerwall 2.0 can output 5kw, with short bursts of 7kw. One of those batteries can power these items at night:
- Freezer or 2nd Refrigerator
- Garage Door
- Some Lighting
- A Few Outlets
- A Small Microwave
However, because the Powerwall 2 is AC coupled, your system will have additional power available during the day. If you have a 6kw PV system, you will not only have the Powerwall’s built-in 5kw inverter, you will have the PV’s 6kw inverter as well, for a total of 11kw of available power, at mid-day. Besides, by giving more available power during the day, this architecture will also provide maximum self-consumption and savings.
In most cases, to back up an entire house, you will need at least 2 Tesla Powerwalls. Adding additional batteries will also maximize your energy savings. The added cost of 1-2 extra batteries and inverters is worth it for some people to have even more piece of mind, in the event of an extended power outage. A natural disaster, such as a hurricane, tsunami or earthquake could take the power out for many weeks, if not months. The 2006 Hawaii earthquake took the power down on the South side of Maui for three days and hurricane Iniki took out the power on much of Kauai for three months.