LiFePO4 - SOK or Renogy.
Not looking for a big bank or high charge/discharge currents. Don't need charging below freezing. In Canada things become difficult/expensive. Narrowed down to these 2: 1)SOK, 100AH, $CAD 975 ...
Forum Discussion
Almot wrote:phemens wrote:
He helped me figure out all the correct settings for my MPPTs and charge controller.
Lynac Lithium
As an aside, the storage of LiFePo4 batteries at 50% is meant for long-term storage (i.e. over the winter), not a problem at all if it's a matter of weeks.
I'm curious what he suggested on controller settings. I see manufacturers labeling their controllers "Lithium compatible" while they are just regular 3-stage controllers with Bulk, Absorb and Float, and Absorb is often fixed 60-90 minutes. My impression has been that Lithium cells don't need Absorb for any substantial period of time. Odd controllers like EcoWorthy that switch to Float in a few seconds after hitting Absorb, is what it needs. I think Float won't hurt much, especially if you set it below BMS cut-off, so it would just start Bulk when voltage drops below Absorb.
Yes, 50% SOC is for long term storage. When you're going to use it in a matter of days or in 2 weeks, you can charge it fully. It's a sliding scale, the more paranoid you are about it the better the chances are that it would live up to the promised 3000-4000 cycles.
In a nutshell, I'm using a 3000w all in one Samlex unit, with Victron MPPTs for the solar. Here are the settings he gave me for the Samlex (settings essentially same for the Victron, but with temp cutoffs):
Battery type= 1 Lithium
Charging profile 3=2Stage Type1
Absorb Exit Amps=0A
Absorb Time=1 min
Floating exit=12.00V
Equalize-4stages 0=No
LV cut off time = 1200 sec
LV detect time=10 sec
Batt low voltage=12.00V
Low volt alarm=11.50 V
Reset Voltage=12.60 V
Batt over volt=14.40 V
Compensate= 4 mV/C/C
Floating voltage=13.00V
Equalize voltage=14.00V
Absorp voltage=14.20V
