Looking for help after a frustrating day (not) on the water....

I got an engine check warning while my oldest son was skiing today, and we ended up getting stranded in the middle of our lake when we couldn't restart the engine. Here is the error code I got:
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Of course it was 3pm and the local dealer closes at 2pm on Saturdays.... I eventually found a Moomba dealer whose service guy was still around, and he told me this was an error indicating an insufficient charge. So I used the on-board charger (I have a dual-battery set up) for over 4 hours, and no dice!

Can anybody help on this? Do I have an alternator problem that doesn't properly charge the batteries, or maybe do I have bad batteries? We only have 18 hours on this new LSV so I'm more than a little frustrated. I'll be calling my dealer at 8am on Monday morning, but Can you guys share any thoughts or suggestions?