I have a Hymer B544 Classic 2003 fitted with an EBL99 and 200Ah of leisure batteries. Recently I added a 150W solar panel and an LR1218. I religiously followed the installation instructions, and at first everything seemed to be fine: at first on a sunny day I could see a little charge going into the system on my Hymer's analogue display panel, and eventually the motor and leisure batteries both showed a little over 14V (after several sunny days, with no leisure use, so I'd expect the batteries to be fully charged). However, today I disconnected the LR1218 for safety to install something else nearby. I disconnected it in the reverse order of the installation instruction. After I connected it again a few minutes later, there appeared to be something wrong: It's a sunny day, but it appears only the starter battery is getting charged by solar. It has over 14 volts on the display panel, but the leisure batteries show less than 13V, even though I haven't used them at all. If I start the motor, the leisure battery voltage goes up to more than 14V. The EBL99 battery switch is in position 'Ein'. The solar fuse in the EBL is good. All connections are correctly made. I contacted Udo Lang and he suggested that I temporarily disconnect the red wire that goes from the LR1218 to the starter battery, so that only the leisure batteries get charge from the solar panel. I'm trying that, but after 3 hours in the sun the leisure battery voltage is still only 12.8 (which I think is what you would expect from fully-charged batteries without a charger connected). Could be a duff LR1218?