Fox ESS UK Reviews 

Sadly Fox ESS seem far more interested in selling kit than dealing with customers problems.
What they totally fail to grasp is that putting faults to rights is a very effective way to test and improve your equipment.
Happy customers are an invaluable part of any sales and marketing operation.
Emails bounce, texts go unanswered, very very frustrating.

I had an issue with what I thought was the inverter. Spoke to a few guys but eventually got through to Lewis. He was brilliant. Got in touch with me through WhatsApp so I could send him videos and photos of the issue. Then also rang me back to find out if the issue was resolved. Never had someone who is so attentive with customer service. Problem was resolved as well

Great service from Lewis Cooper who managed to solve a long outstanding issue with our solar power system. Would highly recommend

Very helpful Engineer called and confirmed we needed a new battery and promptly ordered it. I’m still waiting my RMA its been 11 days now and not heard anything!! Ticket number 163446. I’ve been in communication with the engineer ( which has been very helpful) but he hasnt had any feedback either from the RMA. Is there a problem with Fox ess that the RMA is too slow to respond!! We are not getting the best service especially during this sunny weather.

Extremely disappointed with the level of customer service and after-sales support from Fox ESS.

We reported a faulty piece of equipment over a week ago and, despite repeated attempts to get an update, we still have no clear indication of when the replacement parts will be supplied. The lack of communication has been frustrating, and we're left chasing for information rather than being kept informed.

As an electrical contractor, our reputation depends on supporting our customers quickly when issues arise. Delays like this reflect badly on us, even though the equipment failure is outside of our control.

The products themselves may be competitively priced, but reliable warranty support is just as important. Unfortunately, based on this experience, it has made us seriously reconsider whether we continue specifying Fox ESS products on future projects.

I hope Fox ESS takes this feedback seriously and improves its warranty process and customer communication.

Steven was super helpful when an inverter had a fault and needed to be replaced. He took the time to explain and guide us through the issue and helped in rectifying this problem quickly and efficiently.

Thank you for your hard work!

We had multiple firmware updates and issues with a commercial installation yesterday involving an AI link, 3 x Fox pro inverters & 9 batteries, all of which Lewis in tecnical support was excellent in helping us overcome these problems. We also had an update on the batteries firmware having being completed in the back ground long after we had left site.
We discussed the latest firmware updates being uploaded onto the Fox Tech website and us taking a copy of these to site for future installations being commissioned.
Many thanks,
Andy Jones
Severn Valley Renewables

Support from Fox is as fantastic as always. Today I got the engineer Lewis who has helped me numerous times in the past and always goes above and beyond.

Lewis was a great help in assisting me with a few technical issues. I would recommend him specifically, he is a great electrical engineer with vast knowledge.

This Fox ESS system is utter rubbish. It is buggy, The app doesnt work properly and the battery randomally decides not to charge over noght when it feeels like despite set up for forced charge. In the past 4 weeks the battery has failed to charge 4 times. Yet it charges during inbetween. Very Unrealiable Not reccommend waste of hard earned money.

Had an amazing experience and help with agust, very helpful and very knowledgable. Very valuable member to fox! 5/5

Lewis helped us sort out an awkward interrupted firmware problem, giving us guidance and advice. Took a while but got it sorted. Thanks!

I contacted customer support today to resolve a fox firmware battery issue and error codes. Louis and Jackob were very helpful and the problem was resolved satisfactorily.

Well, where do I start? Firstly, communication from start to finish was brilliant. Kept me informed of everything. I felt like I was getting the service I deserved. The Fox inverter and battery are as premium as it gets.

I had it installed in the side passage, and it looks the part. Great energy saver for sure. Best to buy off-peak energy to use at peak times, especially in winter. The company allow you to control things on a dedicated app. Very similar to a lot of other installations I've had done. Makes life easier to control with my phone.

All that is left to say is I highly recommend this.

Lewis, the engineer from Fox was excellent and deserves 5 stars, because against the odds he finally managed to replace batteries that failed on 3 December 2025. It is now 10th June 2026. The company’s repeated delivery of the wrong items and failure to collect is abysmal. More recently some parts have been delivered, but with essential components missing. My house and yard have provided free storage for months. So no stars for failures of communication, but 5 for Lewis who spent the whole day getting yet another piece of missing equipment and hours on installing. Excellent engineer, Fox very poor company

Impossible to contact Fox ESS UK when an issue comes up. No response through contact page on website and no obvious telephone number to contact. when i did find a number 020 7052 3472 it puts you on hold and then says no one availabe - leave a message and hangs up. System installed less than a year ago and currently not working at all due to faulty inverter.

I have been installing Fox ESS products now for a a few years having found difficulties with another manufacturer. I really like the Fox inverter sand batteries, they are not complicated to install and I have only had about 1 out of 250 units that needed to be replaced and that was only due to a noisy fan. Fox carried out the exchange within 2 weeks.
Despite any bad reviews you see online about the app, it is really good and they do improve it every now and then to keep up with the times and its really insightful.
I can log in and change settings to support my customers all from my phone saving visits to site.
I think if you have a good installer it also helps, if you get left on your own and nobody sets the app up for you then it can be tricky.
Support is part UK part China and we get matters resolved fairly quickly, I have even had two engineers come out to support me on a bigger project - first time that's happened in my solar career!
If you are a home owner or business owner weighing up the products that have been recommended to you, then I recommend going with Fox ESS. Its a solid company that will be here to stay.

My first contact was with Thompson who was extremely helpful sending through a video on how to reset my Foxess system when that didn’t work he put me in touch with Alec who is based in the UK at the moment and arranged for a new dongle to be sent which arrived within 24 hours And as I was still struggling he made an extremely long journey to come and sort the situation in person, I don’t think they could’ve tried any harder or been more helpful in resolving my fox app issues

Thankyou Bernard and team. You are all always most helpful

​It was early 2025 when I installed a Fox EP11 and 9kW Fox ESS hybrid inverter, alongside 25 solar panels. The system is bulletproof. No problems, no calls. I am a first-time customer (isn't everyone buying solar today?) so I'm glad it was easy!

When I researched which brand to use I chose Fox as they are the biggest in Britain. (And indeed Europe.) No-one sells more which made them look like the brand to trust. I've not been disappointed. They have a British warehouse too, which I'd like to think would fix a problem if an issue occurred, rather than dealing with a manufacture in China.