Hello. New guy, new installation, first time installing a complete Victron system. I am in need of some advice from the subject matter experts here. I am in the tail end of the install on my toy hauler and am experiencing a mid point alarm. A little bit of background, the trailer has an AmpereTime 200ah 12v battery, which is now almost 2 years old. The new install is a 24v system composed of a MP2 24/3000/70, (3) MPPTs, Lynx, BMV712, Battery Protect, Battery Sense, Battery Balancer, and a 2nd AmperTime 200ah battery. I added the battery balancer due to the differences in battery age. Before power-on and commissioning of the system I did charge each battery independently to 100% SOC, noticing a 0.1v difference. The batteries have only cycled a few times at this point. Mid point voltage is 0.2% during bulk, but somewhere toward 100% SOC it peaks to 4.2%. I have not yet noticed if the battery balancer is working.
Settings:
- Ampertime charge voltage: 14.6v (no mention of abs or float) x2 = 29.2v
- Victron factory presets:
- Absorption = 28.8v
- Float = 27.6v
- Current Manually Entered
- Absorption = 28.0v
- Float = 27.6v
Is the 4.2% mid point alarm concerning? Should I ignore the imbalance? How to correct or improve it without buying a new battery? Can I further drop the voltage setting for absorption?