I live in a village with an erratic mains power supply and I usually get 4-5 power cuts a year, with a recent one lasting 24hrs. I got in touch with Chris at SES who was helpful, energetic and enthusiastic and gave me a quote for a 13.5kW GivEnergy battery system that would link to my existing solar panels. He was able to answer the questions I had and he supplied me with example pictures of previous installations he'd done. I was impressed with both his technical knowledge and people skills, and I was happy with the quote, so we shook on the deal and agreed a starting date.
Nathan turned up nice and early on the agreed date and after a quick tour of the place and a chat about options for cable runs, etc he got cracking, and virtually never stopped the rest of the day. He kept me updated with progress and double checked what I wanted whenever queries arose. By 3pm he was done with the tools and into setting the system up via the app. He left the house very clean and tidy, and had all his rubbish collected in a cardboard box...if only all contractors were like that!
As for the battery, it's doing exactly what it said on the tin. It charges up within 2-3 hours on my cheap rate, overnight tariff and then powers the house all day. I've not had to use any mains electricity at the day-time rate, which is a big saving. I'm in a 3-bedroom cottage with an air source heat pump. It has coped with that, the electric cooker, a dehumidifier, a few hours of tumble drying and a short, part-charge of my electric car, with capacity to spare.
So, long story short.. I'd definitely recommend a GivEnergy battery system from SES.