We recommend the Lithium ion battery Pylontech of the manufacturer of the same name. It is sold in Europe by the Belgium company Wattuneed. The battery has a storage capacity of 2.4 kw and offers a guarantee of 6000 cycles at 90%. The advantage of this battery is that it has been designed to greatly simplify connection and configuration. To increase storage power, simply connect several Pylontech batteries together.
Wattuneed also sells the WKS hybrid inverter, which fits perfectly with the Pylontech battery. It manages the charge and discharge of the batteries and allows to have a photovoltaic installation which can be on-grid or off-grid (connected or not to the power grid).