A nominal 12 volt system normally is charged by 1 14.4 volt alternator. And the equipment designed for "vehicle power" (car or boat) is designed to handle that. However, a bad regulator can pump out 17 volts and do all sorts of damage. Unregulated solar or wind power sources can do the same.
Some radio equipment is commonly spec'd for "13.8 volts plus or minus 15%" which means they can take 14.4 just fine, but at battery-only voltage they don't work so well.
So...you'd have to contact the maker to find out just what voltage range they prefer. Your electronics, etc. may very well prefer 13.8 to 14.4, and as long as your Engel is built the same way, your only worry would be if your system (ay part of it) exceeded that voltage. An overvoltage alarm or cut-off might not be unreasonable to ensure against that.
If your only high voltage source may be an unregulated solar panel, the easy answer there is to add a solar controller to make sure that can't be a problem.
Some radio equipment is commonly spec'd for "13.8 volts plus or minus 15%" which means they can take 14.4 just fine, but at battery-only voltage they don't work so well.
So...you'd have to contact the maker to find out just what voltage range they prefer. Your electronics, etc. may very well prefer 13.8 to 14.4, and as long as your Engel is built the same way, your only worry would be if your system (ay part of it) exceeded that voltage. An overvoltage alarm or cut-off might not be unreasonable to ensure against that.
If your only high voltage source may be an unregulated solar panel, the easy answer there is to add a solar controller to make sure that can't be a problem.
