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Lithium battery storage limitation for home.

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MikePrescott

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Joined
Feb 14, 2025
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Prescott
Has anyone come across an issue with lithium battery storage when permitting a system?
I am starting to build a home in Yavapai County Arizona to be off-grid and came across an issue with how much lithium storage. According to code, a maximum of 40kwh is allowed in a utility room and 80 kWh of batteries inside a garage.

Being fairly new to solar systems and watching videos, I have never heard on any YouTube videos I have watched, ever hearing about storage limitations. I have actually heard people state that more storage the better on whatever you can afford.

I am estimating that our home will be using 50 - 60 kWh of power in the summer and was planning on using 4 EG4 Power Pro Indoor Batteries @ 56kwh total storage located inside a utility room in the house. I will only have a carport so the batteries would be exposed to outside eliminates so the batteries cannot be located there.

Has anyone come across this situation when permitting a system? What is a feasible workaround to have adequate power to run my house off grid?
 
Every AHJ seems to have different sets of rules, so you are best served by asking your local AHJ for their restrictions (if any).

And asking for clarification on why you can have 100KWHR of Lithium Ion batteries, which are much more dangerous, in the car that's parked in the garage, will just get you labelled as a troublemaker. 8*)

You might look at the EG4 PowerPro OutDoor WallMount batteries, if temperature extremes aren't too hot or cold in your area, you might mount them on an outside wall with short DC wires to the inverters (or get the 18Kpv or equivalent and mount everything outside). They do have internal heaters, so that's helpful.
 
MikePrescott said:
Has anyone come across an issue with lithium battery storage when permitting a system?
I am starting to build a home in Yavapai County Arizona to be off-grid and came across an issue with how much lithium storage. According to code, a maximum of 40kwh is allowed in a utility room and 80 kWh of batteries inside a garage.

Being fairly new to solar systems and watching videos, I have never heard on any YouTube videos I have watched, ever hearing about storage limitations. I have actually heard people state that more storage the better on whatever you can afford.

I am estimating that our home will be using 50 - 60 kWh of power in the summer and was planning on using 4 EG4 Power Pro Indoor Batteries @ 56kwh total storage located inside a utility room in the house. I will only have a carport so the batteries would be exposed to outside eliminates so the batteries cannot be located there.

Has anyone come across this situation when permitting a system? What is a feasible workaround to have adequate power to run my house off grid?
Click to expand...
It is up to the AHJ as almost everything is. There are ways within code to install a larger system and how the AHJ interprets that will dictate what you can do.

I would soggiest talking with them after you review the relevant code.

Outside the house (outdoor wall mount), in the house in a basement for example, in a garage and so on all have different limits.

Not putting them in a n enclosed room if over the limit avoids ventilation requirements for example.

Have you found the relevant fire code to review?
 
wpns said:
Every AHJ seems to have different sets of rules, so you are best served by asking your local AHJ for their restrictions (if any).

And asking for clarification on why you can have 100KWHR of Lithium Ion batteries, which are much more dangerous, in the car that's parked in the garage, will just get you labelled as a troublemaker. 8*)

You might look at the EG4 PowerPro OutDoor WallMount batteries, if temperature extremes aren't too hot or cold in your area, you might mount them on an outside wall with short DC wires to the inverters (or get the 18Kpv or equivalent and mount everything outside). They do have internal heaters, so that's helpful.
Click to expand...
Thank you for the reply.

I never thought about electric car storage in the garage🤣.

I actually purchased my 4 batteries just before the tariffs hit and was able to get them at a good price. Going with outdoor batteries was going to cost another $1200 so I went with the indoor version.
 
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