No Power at Panel

[Cosmo725]

I have a 2001 B34 and installed a new House (200amp AGM) and Starter battery (100amp AGM) two years ago.  Boat was launched last week and I have no pawer at the panel. Battery Charger says the batteries are ready to go and I tested them with a voltage/amp meter and they are charged up.

When I turn on the battery switch under the Nav Table the low voltage light comes on for a few seconds and fades away.  I searched the forum but did not see any posts related to this issue, has anyone had a similar issue?