I’ve bought a few different ones of these over the years. The 79p ones are garbage. I tried the £3.99 ones encouraged because they contained a NiMH AA that could be upgraded. But they lasted a single year too (water ingress and corrosion).
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
6x 2.4kWh Pylontech batteries (14.4kWh)
LuxPower inverter/charger
(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)