Just had a potentially dangerous incident with the sailboat house bank. It has 3 gp27 batteries fed by the normal alternator setup and by a 130 watt solar panel with a controller. Bank is one year old. I noticed the battery compartment hot and checked with the IR thermometer. The battery in the middle was at 140 F, the other 2 at 90 F. Took it out and it stayed warm for many hours. Apparently an internal short. The question is: how to monitor all batteries in the two banks and how to disconnect or isolate a bad battery while the boat is unattended. Thanks in advance for ideas.