Terrible
My Solax inverter and batteries lasted only 4 years and then stopped working. I received a succession of replacements under guarantee ( 3 batteries and 2 inverters) most of which appeared to be used rather than new units. None of them worked and I was without solar battery storage for a year. Neither Solax nor JoJu (the installer) made adequate attempts to resolve the issues nor to collect the decommissioned (non working) batteries from my cellar. Solax themselves came up with a variety of reasons why the system wasn't working, none of them credible. he original failure seemed to happen after a remote software update. In the end I had to pay someone to remove the old units and then had a British battery brand installed at my cost. Neither Solax nor JoJu have offered compensation despite the batteries and inverter being under guarantee. I would not recommend either of them - both Joju and Solax were completely useless.