Lifepo4 float setting?
I have not had to deal with a float setting so far with PWM controllers but I have a Victron 75/15 coming tomorrow and reading up on the settings,it is confusing especially the float setting..Some say...
Forum Discussion
"Victron is rather vague about tail current, simply stating that LFPs should be set higher than other batteries and the default is 4%, so I set mine to 5%."
The Victron monitor has 4% default for tail current, don't know why a charger would use such a thing if that is what was meant there.
The tail current is what the amps get down to at the charger's set high voltage to indicate the battery is full according to the monitor's designer's notion. Trimetric 2025 monitor uses 2% of AH capacity for FLAs. So 2 amps per 100AH
AGMs like Trojan and Lifeline say current down to 1/2 an amp per 100AH means the batt is full, much less than that 2 amps for an FLA with the Trimetric
AFAIK , LFPs are similar to AGMs for having a very low current to indicate full, so the Victron 4% default is way too high for AGMs or LFPs--it can be set lower.
So why would an LFP owner want to use even higher than 4% ????
Another Victron monitor setting is for charging efficiency. Trimetric uses 94% for that and Victron uses 95%. For FLAs. Those can be set to another value for other types of battery. Since LFPs do not gas their charging efficiency is much better so the Victron would be set to 99%?
If the charging efficiency is set low, that means the battery will get to a higher SOC than the monitor's AH counter thinks it is to.
I do not understand Victron's voltage setting for LFPs at Float voltage since the voltage while charging will be way higher so that leaves it all to the tail current setting. There is something about the proper Float voltage for the battery by its specs and then what the Float voltage setting of the charger might be too.
Since absorption tapering amps can take forever, Trimetric says they chose 2% just to get it going again by resetting to 100% in a reasonable time. So that may not coincide with when the battery is really full by hydrometer checking the SG. Could be not full yet at 2%.
The Victron monitor has 4% default for tail current, don't know why a charger would use such a thing if that is what was meant there.
The tail current is what the amps get down to at the charger's set high voltage to indicate the battery is full according to the monitor's designer's notion. Trimetric 2025 monitor uses 2% of AH capacity for FLAs. So 2 amps per 100AH
AGMs like Trojan and Lifeline say current down to 1/2 an amp per 100AH means the batt is full, much less than that 2 amps for an FLA with the Trimetric
AFAIK , LFPs are similar to AGMs for having a very low current to indicate full, so the Victron 4% default is way too high for AGMs or LFPs--it can be set lower.
So why would an LFP owner want to use even higher than 4% ????
Another Victron monitor setting is for charging efficiency. Trimetric uses 94% for that and Victron uses 95%. For FLAs. Those can be set to another value for other types of battery. Since LFPs do not gas their charging efficiency is much better so the Victron would be set to 99%?
If the charging efficiency is set low, that means the battery will get to a higher SOC than the monitor's AH counter thinks it is to.
I do not understand Victron's voltage setting for LFPs at Float voltage since the voltage while charging will be way higher so that leaves it all to the tail current setting. There is something about the proper Float voltage for the battery by its specs and then what the Float voltage setting of the charger might be too.
Since absorption tapering amps can take forever, Trimetric says they chose 2% just to get it going again by resetting to 100% in a reasonable time. So that may not coincide with when the battery is really full by hydrometer checking the SG. Could be not full yet at 2%.
