I don't know why but my panel sometimes goes blank and I have to reset everything, date time etc. This normally happens when the battery charger is disconnected. I have had a solar panel fitted. I can get most reading back apart from 1 that reads L _ _ U, The leisure battery reads 50% ?, and the changable readings are 220 nom = 176ah. Can anyone advise me what is happening and how I get it back.