Hi,
I have 4 Varta batterys dual purpose, (12v, 230Ah, 5 years old) connected serially to 48v, 230Ah Leadacid no AGM on my boat. They are used for an electric motor. The batteies are charged by a Zivan NG1. with shore power only. They are charged permanently 5 days the week.
Batteries are checked with a professional midronics tester and have very good „health“.
When I measure Voltage with my digital multimeter at the shunt (Battery +, shunt -) I have 53,7 Volt. BMV 700 shows 49,3V
(each battery measured seperatly show 13,4 V)
Do you have any idea? Thanks a lot in advance
Tom