fox-ess.com

1.6
1.6 Based on 21 reviews

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Average Rating

1.6

/
5

21 Reviews

5 Star
10%
4 Star
0%
3 Star
0%
2 Star
19%
1 Star
71%

All Reviews

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Review Time

Ross Goodfellow
Generally speaking the Fox ESS system is brilliant EXCEPT FOR THE WIFI DONGLE which is woefully inad

Generally speaking the Fox ESS system is brilliant EXCEPT FOR THE WIFI DONGLE which is woefully inadequate and cuts off constantly, effectively making the entire system useless. Unless they upgrade this feature then I strongly recommend against buying Fox ESS.

1
Date of experience: Feb 09, 2026
Ross Goodfellow
Fox ESS system dysfunctional Wifi

Generally speaking the Fox ESS system is brilliant EXCEPT FOR THE WIFI DONGLE which is woefully inadequate and cuts off constantly, effectively making the entire system useless. Unless they upgrade this feature then I strongly recommend against buying Fox ESS.

1
Date of experience: Feb 01, 2026
daniel jackson
Used Fox ESS for a couple of systems…

Used Fox ESS for a couple of systems now. One was a large 98Kw system, & I needed assistance from their tech department. Had an engineer, Ben Humphries, visit my site, & I must say he was brilliant. Very knowledgeable & knew his stuff. Highly recommend Fox & especially Ben.

5
Date of experience: Jan 26, 2026
Mark Dadson
Do not have FoxESS batteries or…

Do not have FoxESS batteries or inverters installed, they are an uncontrollable piece of crap. The app is useless and very complicated

1
Date of experience: Jan 20, 2026
Paul Zdanowski
EP12 Problems

Had an EP12 battery installed mid December 2025. It has proved impossible to programme charge/discharge times despite the app saying that the settings are "successful " My installer has spoken to FOX on numerous occasions but still not working correctly. As its within the 30 day period I have rejected it and asked for a refund.

1
Date of experience: Jan 19, 2026
Martyn Woods
I use grid power when my batteries are…

I use grid power when my batteries are 60% full. This is bullshit. I thought the batteries would be able to power a bungalow overnight at 60% obviouslyl not

1
Date of experience: Jan 02, 2026
Nikki
Absolutely worst battery and worst…

Absolutely worst battery and worst company! DO NOT WASTE YOUR MONEY! They never answer there phones and you can’t get any support!

1
Date of experience: Nov 18, 2025
I've had my system for 3 years now

I've had my system for 3 years now, and not one single problem. I have had a recent upgrade to my Energy Cubes, and charging off peak via the app has saved me several hundred pounds per year. Win!

5
Date of experience: Nov 11, 2025
clive Hobbs
Three months after install still not working.

Three months after install the Fox system still doesn’t work. Unable to charge or discharge batteries. Installer passed me to Fox who are trying to help with slow but continual email assistance. I have little faith and wish I hadn’t started this journey, very expensive install and I am not seeing any savings. I will continue to give them a chance but not feeling optimistic at this time. It will be interesting when I ask them to retrieve the install and ask for a refund!

2
Date of experience: Oct 29, 2025
Stephen Skipsey
Had foxes system installed less than a…

Had foxes system installed less than a month ago. The WiFi dongle has disconnected from the WiFi & won't reconnect & my installer wants£120+vat to sort it out. Have just researched this issue & it's a common problem with these dongles & modern routers. Shouldn't the installer perform due diligence on this issue & make sure they're compatible?

2
Date of experience: Oct 23, 2025

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