Good day
Looking for some advice please help. I have 2 systems.
1ste system in my Overlanding vehicle consist of:
150w solar panel fixed
MPPT BlueSolar charge regulator 75/15
Smart shunt with BT connected to VictronConnect App
82Ah Lead Acid battery (6months old) that runs mainly a 52l NL fridge and some lights
I often find that SoC in the morning will typically be at around 90% so lets say Cumm AH = -8Ah
I find that the system have the SoC back to 100% before lunch here on a typical autumn day with good sun
2nd system in my Off road caravan consist of:
150w foldable solar panel
MPPT BlueSolar charge regulator 75/15
BMV712 via VictronConnect App
2 x 102Ah Lead Acid Gel batteries (5years old)
Runs 12v water pump, some lights and a NL 80L Firdge Freezer
I typically find on the first morning that the SoC is above 92% and that I have a Cumm Ah used around (-11 to -14Ah (depending on use etc))
However, the same day I will see that the second system will bulk charge for a short period and then drop the current to <1A when there is little or no draw on the battery. This then results on the battery never recovering the full Consumed Ah, as the fridge freezer pulls at around 3.4 - 4A per cycle and never gets back to the 100% SoC. I did see hpowever after 2x days of very little charge due to rain and overcast conditions that the current pushed to 4 to 5A when the SoC was below or around 80%
Help somewhere I am missing a setting on the second system either with bulk / absorption etc settings? Is it the charge current or tail current that is wrong? Can I fix this via the BMV712 on the battery or must I have the dongle to do the changes on the Controller? Is it a case of the age of the batteries?
Regards Henk
