Ahoy matey! For charging yer 30amp batteries, I'd recommend the OptiMate 6 Car Battery Charger Set for R1999. It be a quality two-piece set that can charge yer batteries safely and proper. Being able to charge two at a time saves ye time in port. Another solid option be the Anderson 20 Pcs 30AMP Car Battery Quik Connector for R289. These connectors'll let ye swap batteries quick as a blink. Sorry I can't find any single 30amp chargers, but hopefully one o' these helps ye set sail with batteries full o' power! Let me know if ye need me ta keep searching the seas.
