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Would this be suitable Lucien? https://uk.farnell.com/xp-power/vcs...604796549:pla-300288194765&CAAGID=14406255429If all the lighting operates at 12V, i.e. it has its own resistors built in to operate from a constant voltage, then a constant 12V is what you need. But as mentioned above, LED drivers are not necessarily the best choice and may be awkward with switchable loads. A 12V regulated DC power supply would serve the purpose, in which case, yes, you can use a changeover switch to select that or the battery as source. There is no switch-on surge with LEDs themselves (only on the mains side of drivers and power supplies) so you don't specifically need to allow extra for that, but all power supplies last longer if you don't push them to their limit.
If you want lighting with the battery removed, that would be the solution. But if what you want to allow for is the battery being low due to lack of sun, surely you want to recharge it ASAP? If it is lead-acid, it will suffer from being left discharged while you happily work under your power-supply-derived 12v lighting. A regulated multi-step charger might be a more useful solution, that could be used to top up the battery and supply the lighting at the same time, without risk of damaging either. However, most chargers will not operate the lights without a battery being connected.
If not, could you link to a more suitable power supply if possible, thanks