Cannon LCR-5001? DCU? What are those?
Okay, DCU = Diesel Control Unit. Actually it is said to just be the enclosure. So, the actual device inside is just the other part, which the acronym stands for something like load control receiver.
And this is what we’ve found on Wikipedia.
20180729/DuckDuckGo Cannon LCR-5001
20180729/https://en.wikipedia.org/wiki/Load_management
20180729/https://en.wikipedia.org/wiki/Energy_Storage_as_a_Service_%28ESaaS%29
20180729/https://en.wikipedia.org/wiki/DCU