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What our clients say

This is definitely the best place to buy solar panels, storage batteries and energy-efficient heaters. Amazing service and great value.

Frank Richardson, Coventry

We had a ten-panel domestic installation. The price was competitive, the installers and electricians were excellent, all up and running in a couple of days, friendly and helpful service through out.

Ken Streat, Devon

Callidus were extremely professional from start to finish with the installation at our unit. Dealing with their team was a pleasure.

Stephen Larkin, Devon

These guys were great, no pushy sales, just a great solution that works really well. We have batteries and solar from them, and it’s saved us a fortune on our electricity bills, with great advice on how to make the most of our dual rate tariff. Their technical knowledge is second to non.

Shaun O'Sullivan , Devon

The entire team at Callidus, from the top to the bottom, are amazing. Knowledge, support, passion to place the customer and their needs at the centre of the process, throughout all phases. Clear explanations with realistic expectations; no over inflated figures to close out a deal. I am so satisfied with their approach that I have already completed an expansion of my system; NOT because it didn’t perform as promised, but in fact we are generating more than expected so have increased the battery storage!! I am now looking to see if they can provide a windmill option to harness the overnight wind potential :)

Marcus Rowe, Cornwall

Brillant product,excellent communication with Steve , first-class installers. Would definitely recommend

Tosh Abbott, Dorset

Such a great team, James done a great job specifying what I needed and a very non pushy approach, all done at my pace, great site survey by Steve who explained what I was getting and why I needed certain things, Ross and Brian done a very tidy install and was a pleasure to have them on site working. They worked hard and got the job done to a very high standard, even answered my questions and explained how the system work. Thanks guys highly recommend!

Mark Cannings, Wiltshire

We live off grid in Cumbria and wanted to upgrade our electricity supply. We contacted Callidus and they were very happy to work with us. With excellent two way communication, they designed the perfect system for us which is easily expandable if we should need it in the future. They were happy to design the system and supply us the parts for us to install ourselves. They programmed the system and were on the end of the phone to help with installation and getting the system up and running. Their after sales service is excellent. It has improved our quality of life no end.

Jack Beach, Cumbria

Just had Callidus solar & battery storage installed .Donna lovely person to speak with, nothing to much trouble.
Brian the electrician, top class,explained everything to be done, very tidy work.
Ross did the panels explaining everything before he started,the finished job looks top class.
Thanks to Ross and Brian for what they did.

Stephen Welham, Devon

I found Callidus on Facebook and initially worried about using a company I knew nothing about for such a financial investment and being off-grid we had no mains electric to fall back on. However, there was no need to worry as Callidus have been professional from start to finish. Designing a solar system for our rural property, their customer service has been fantastic. From James and Steven initially advising on the system package, then Brian and Ross installing with expertise and precision, their attention to detail and quality of work has been excellent. I cannot thank Callidus enough for our solar electricity, truly improving our quality of life and home comfort.

Kerri Featherstone , Durham