Hello, I have the problem that my BMV 702 measures everything, but the energy level is not correct. I never come under 90% even if the voltage drops to 46V. What am I doing wrong? Or is the device defective. Unfortunately, I bought the device from the shop “autobatterienbilliger.de”, I can only warn against buying it from this shop. After the purchase, this shop does not respond to anything. He just doesn't reply. I have switched 4 batteries in series so that 48V with 12 AGM batteries a total of 114 Ah. I sync the display at 100% Does anyone here have an idea