What is guaranteed, and by whom.
A guarantee is only worth reading if it says how many years and names who is standing behind them, which is why the terms are written into your quotation in full rather than summarised here. There are four separate cover periods on a solar and battery installation and they are not held by the same party. Workmanship covers our labour: the fixings, the flashing, the rails, the cable runs, the isolation and the way the battery is integrated into your board, and it is insured rather than simply promised, so the cover does not depend on us still trading. The panel, battery and inverter terms are the manufacturer's, and we handle those claims for you. Battery cover is written against a retained capacity figure rather than simply working or not working, and yours is stated in the handover pack with that figure in it.
It is worth knowing which of those numbers actually matters. A solar panel is a sheet of glass with no moving parts, and it is the component that essentially never fails, which is why a long panel figure is the easiest one for anyone to advertise. What fails is the inverter, the wiring, the roof fixings, the flashing and the battery integration. Every one of those is our work rather than the manufacturer's, and every one of those sits under the workmanship term. That is the number to compare.