Advice for charging 12V batteries with solar panels, no AC power needed

I run a nonprofit youth shooting sports club that uses 12v batteries to power trap machines (clay pigeon throwers). I have several Deka Unigy 12AVR100ET that we use to run the machines. I recently was given five LG Electronics LG280S1C-B3 panels with the idea we could charge the batteries when not in use. We meet only once a month and this shooting range does not have commercial power available. It would help me out a lot if I did not have to charge and lug the batteries back and forth every month. I do have some electrical knowledge in AC and DC, but the only experience in solar has been buying a panel that was made for that application and connecting it. As mentioned, we do not need to convert the power to AC. Below are pics of specs for the batteries and panels. I would appreciate any advice I can get on making these panels work for this application.
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