...
At abc2, investigated why the system voltage is low. Kurt found that the cable to the router did not have a good connection at the panel, which he fixed. During this time the router reverted to factory defaults. grrrr. 
Ling re-installed the router configuration. The system voltage recovered to 12.8 V. This is the second or third time we've seen the CTR350s revert to factory defaults, when they've had a power glitch.