willh
New Member
Have been deep diving into charge settings and lithium charging information. At this point I wish I had just set the Victron recommended profile or the same thing the off grid garage guy uses and continued life blissfully unaware of all the potential details. I must say I am thoroughly confused about what my best approach to charging is at this point.
My greatest anxieties are formed through reading this article:
Given the information in this article it is quite likely I could frequently be overcharging my battery. I have a 230ah 48v battery to be charged with 920w of solar. In the event my charge current is below 3.22amps during the constant current phase my battery would already be overcharged by the time it hits 3.45v based on this article. Seems to be a very likely scenario in any solar setup. Either way even on a great solar day with this setup the battery will be very near full upon reaching 3.45v, which leads me to believe I should take away absorbtion time all together/set lowest limit. That creates it's own problem as now the cells won't have a chance to balance.
As a test I set my multiplus to charge at 7amps max (simulation of my solar array generating 380ish watts of the 930w theoretically possible), absorb voltage 3.45/cell. Upon reaching 3.45v the charger switched into absorb and it took only a few minutes for current to drop down to 0.014c (3.22amps) as described in this article.
My cells never required balance staying below 10mv delta on jk bms. Currently set for balance above 3.45v, not sure if the cells will eventually go out of balance in this charging regime but if they do the bms isn't likely to have enough time to balance them anyways. Initially I thought maybe I'd set cv stage to 3.5v but that only exsasperates the low c charging issue. Am I overthinking this? What am I missing?
My greatest anxieties are formed through reading this article:
Charging Marine Lithium Battery Banks | Nordkyn Design
nordkyndesign.com
Given the information in this article it is quite likely I could frequently be overcharging my battery. I have a 230ah 48v battery to be charged with 920w of solar. In the event my charge current is below 3.22amps during the constant current phase my battery would already be overcharged by the time it hits 3.45v based on this article. Seems to be a very likely scenario in any solar setup. Either way even on a great solar day with this setup the battery will be very near full upon reaching 3.45v, which leads me to believe I should take away absorbtion time all together/set lowest limit. That creates it's own problem as now the cells won't have a chance to balance.
As a test I set my multiplus to charge at 7amps max (simulation of my solar array generating 380ish watts of the 930w theoretically possible), absorb voltage 3.45/cell. Upon reaching 3.45v the charger switched into absorb and it took only a few minutes for current to drop down to 0.014c (3.22amps) as described in this article.
My cells never required balance staying below 10mv delta on jk bms. Currently set for balance above 3.45v, not sure if the cells will eventually go out of balance in this charging regime but if they do the bms isn't likely to have enough time to balance them anyways. Initially I thought maybe I'd set cv stage to 3.5v but that only exsasperates the low c charging issue. Am I overthinking this? What am I missing?