A LVD or low voltage disconnect, is a piece of insurance. It automatically disconnects a battery string when the battery voltage goes under the preset limits and reconnects it when the battery voltage increases. These are two sided with a single side handling up to 100A loads.
Why does this matter? Well if you are running a solar panel or telecom battery string you can only charge a dead battery so many times before the batteries are junk. Disconnecting the load before they are totally dead allows you to make your batteries last up to years longer. Do you really want to kill a $500( or higher) battery string because you didn't have a 200$ LVD? I have even installed these in RVs to protect their batteries and invertors.
These also protect the invertors or other hardware by disconnecting a low voltage power source before the burn something out. An invertor can burn out their resistors trying to make 120 from 30VDC when it expects 48 to 60VDC.
These units fit into a 19 inch rack and all the connections are on the front. No need to make sure you can get to the back. A clear plastic shield provides some accidental short protection. If you are running a solar battery farm or a telecom battery string you should have these protecting your batteries. You can run both sides to increase the load size to 200A and multiple units to increase the capable load above that.
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