White Shadow
Active Member
- Feb 17, 2023
- 127
- Boat Info
- 320 Sundancer 2005
AB Dinghy w/9.9 Merc
Axiom 9 MFD
Kohler Model 5E Generator
- Engines
- Twin Mercury 350 MPI Horizons w/Bravo III Drives
I just installed a new Victron BMV712 Battery Monitor and I am quite happy with the fact that I will no longer be guessing how much juice I have left. However I noticed something that seemed very strange in one of the readings, specifically the voltage on the auxiliary battery bank (The starter bank). When I was running the generator the starting bank was showing as over 16 Volts (hovering around 16.77V), that seems very high to me. The house bank was showing 14.3V which is more what I would expect to see. When I switched back to shore power, both banks initially showed around 14.6V and after a few minutes both banks were around 13.8V. It was only when running on the generator that the start bank shot up to the 16.7V range. Is this "normal"? If not, any thoughts on why this could happen? I don't want to fry these relatively new batteries.
Specifics:
2005 320 DA
House Bank - 4 x 6V 230AH Deep Cycle Lead Carbon batteries (in series and parallel - so 12V 460AH). Installed last spring.
Start Bank - 2 x 12V Group-31 AGM Starting Batteries (1000 CCA) in parallel. Installed last spring.
Charger - PD2030 (I assume came with the boat, so likely circa 2005)
Shore Power is 12V 30A service
Generator is a Kohler 5e (also I assume circa 2005)
A picture just to show my new monitor install
Specifics:
2005 320 DA
House Bank - 4 x 6V 230AH Deep Cycle Lead Carbon batteries (in series and parallel - so 12V 460AH). Installed last spring.
Start Bank - 2 x 12V Group-31 AGM Starting Batteries (1000 CCA) in parallel. Installed last spring.
Charger - PD2030 (I assume came with the boat, so likely circa 2005)
Shore Power is 12V 30A service
Generator is a Kohler 5e (also I assume circa 2005)
A picture just to show my new monitor install