AM Solar has a nice list of recommended settings for Victron products (and not only) including Victron Lithium batteries. Are those good?
I own a BMV-702, a MPPT 100/50 & a Victron Lithium Superpack 12,8V/60Ah. Some of the settings differ from Victron's manuals/specs/defaults.
1. BMV-702 manual only provides two settings specific to Lithium batteries (ch. 6, p.37): Peukert’s exponent at 1.05 and charge efficiency at 99% (those are identical to AM Solar's guide). Other values are defaults for "all batteries":
- charge voltage default = 13.2V (AM Solar = 13.9V for Victron Lithium)
- tail current default = 4% (AM Solar = 2% for Victron Lithium)
- temperature coefficient = 0.0%cap/degC (AM Solar = 0.5%cap/degC for Victron Lithium)
2. Bluesolar MPPT 100/50 manual provides (ch. 3.7, p. 11):
- absorption voltage for LiFePO4 = 14.2V (AM Solar = idem)
- absorption time for LiFePO4 = 2h (AM Solar = 1h)
- float voltage for LiFePO4 = 13.2V (AM Solar = 13.5V)
- tail current default = 2A (p. 9) but is actually disabled when choosing Lithium batteries (knob at setting 7) with firmware 1.46 (AM Solar = 0.5 per 100Ah for Victron Lithium)
3. The 12.8V/60Ah Victron Lithium SuperPack comes without any manual but according to specifications it should operate with:
- absorption voltage = 14,2V – 14,4V
- float voltage = 13,5V (Victron = 13.2V, AM Solar = 13.5V)
- max charge current = 30A (while MPPT 100/50 can deliver 50A, as it name suggests... it's nowhere mentioned/recommended in the manuals but for safety I have limited my MPPT's max charge current to 30A using Victron Connect app).
So which settings are "better"? Or maybe soome settings (like a higer charge voltage) are better for "performance" while other (lower charge voltage, disabled tail current) are better for battery longevity?