SolaX is a Chinese company who have been in the UK inverter market since 2015 with a wide range of inverters suitable for many solar energy set ups. They also have a range of Hybrid inverters that let you connect your solar panels and battery in to the same inverter (DC Coupled).
Being a modular battery, you can start small and add more batteries in the future. Just be aware that if the range changes then Sola X may not continue to produce the batteries that suit your system. Unless you have more than one of the batteries then the charge/discharge rate is going to be disappointing too, not even enough to power your kettle.