Good day. I have a boat that I will be on for 2-4 weeks at a time and using for living, cooking, lighting, etc as a what people call a working system. I have 3 items I need setup properly. Can you all assist with settings? I have a Victron BMV 712, Victron 150/70 MPPT (870watts), Xantrex 150amp charger/inverter, and 4 Lion Energy Safari UT1300 105ah lithiums.
1st priority is longevity of my batteries, but a very close second is:
Fast charging. I have to burn precious diesel to run generator (maintenance/fuel) to use the Xantrex charger. And, my solar is on a boat and thus never optimally positioned so I need to maximize my Victron MPPT 150/70 when I get sun. I cannot wait around for slow charging my lithium batteries as I only have 400 amp hours and uses 200-300 per day and need it back daily.
| MPPT settings: |
| Battery: User |
| Absorption: 13.9 |
| Float: 13.9 |
| Equalization: 0 |
| Temp comp: off. battery should do it. |
| low temp cutoff: off battery BMS should do it. |
| BMV 712: |
| Capacity: 420 Ahr |
| Charged voltage: 13.9/14.0 |
| Tail current: 4% |
| Charge detection time: 3-5 minutes |
| Peukert exponent: 1.05 |
| Charge Efficiency factor: 99% |
| Current threshold: 8 amps (2% of capacity?) |
| Time to go average: 3min |
| Zantrex 150 amp charger. |
| Bulk: no setting, constant amps till reaches absorption voltage. |
| Absorption: 13.9 - 14.2. Cannot decide what to enter. |
| float: 13.5 to 13.9 . I don't know what to enter. |
| Absorption time: lowest possible I can set to. Under 30 minutes. |
| No equalization |
| No temp compensation |
| Invert low volt shutdown: 11.5 safe value. How much am I leaving in capacity at 11.5 vs 10v? |
| Recovery. 12 or 12.2 volts. Not sure what to enter. |
