I'd suggest for any emergency at least 3 sets of 1500+ charge AA Eneloop rechargeables for each light and a good solar charger such a the 7 watt Goal Zero charger and Guide 10 Plus charger or a Powerfilm 4AA solar charger.
Haven't really done the math but seems like with all these the watt output is pretty small and if you only have one or two days of sun in a week or need to keep moving you're going to need a larger panel and some way to restrict charge if do have mucho sun or just one battery. Maybe harbor freight 15 watt minimum