Hello all. We have been living off grid for about 2 years now. We have a 12 volt system because the only thing plugged i that we use is a car fridge. So we have 2 280 watt panels. That go into a 40 amp CC. We use 4 210 6 volt batteries. We have had this for the 2 years. About a month ago we had a baby and decided to get new battery's and get a mini fridge. So we got 4 230 6 volt batteries and a 30 watt freezer. Here's the issue. Everything's plugged in normal. We unhooked everything so only solar was at batteries. The CC will read batteries at 100% then they start dropping when sun goes down with nothing plugged in. I even unhooked 2 batteries so it was just the 2 6 volts and it does the same. Any ideas why batteries aren't staying charged?