Hi , had a Clayton 100Ah , 2500W LPS in my T6.1 for 4 years , been great until I foolishly let van engine battery and the LPS run flat. Not had a lot of use these last 12 weeks , thought I had checked and run it enough, obviously not. Van now running after an overnight trickle charge , but the LPS will not wake up, running the engine or plugging into 240v always woke the thing up and the lights all came on indicating charging. No more. I do believe the LPS and its management system might have gone into some thing called a 'deep sleep' so as to protect the battery. Nothing in the instructions helps , and I am waiting a reply to my e mail into Clayton , but likely the Xmas break in the way. Anybody out there had a similar experience and know what to do ?? , Many thks for any help offered , Jeff