I have a 120AH Lithuim (lifePO4) and I am finding when I use the Li-Iron profile to charge it seems to get to Float very quickly
Example is, completed with putting in 50 AH and gone to float voltage but I knew battery needed way more charge than 50AH and changed the charger to Normal mode (lead Acid) and it put another 27AH of charge into battery which made more sense
This is the second time I have used it on this battery and both times this has happend, is this normal or for it to cut out amp’s and drop to a low float voltage and the app shows it as a completed cycle ?
It goes by voltage - so reaching target voltage then dropping amps for absorption time. Then back to float.
So settings go a long way to determine this as well as battery behaviour during charge.
Lithium needs a much shorter time than lead acid.
Charging can be cut off a number of ways, the battery can also disconnect.
Do you have a shunt as well?
Thanks for a reply, yeah I understand that it drops the amps for absorption and it’s only voltage but this is not happening for long enough before going to float and dropping the voltage in the mid 13’s when the battery needs to make 14.40 to be fully charged that not going to happen ever.
As i mentioned putting the charger on Normal mode it will put the 10amps in and voltage in the mid 14’s before dropping the amps out and the voltage staying over the 14’s for absorption for most of the day until it hits the 14.40V fully charged and goes to float.
No shunt, battery is just used for trolling motor in boat and removable easly.
it’s like the Blue smart chargers Li-iron profile is just not correct, works perfectly for other battery types for sure…
I have a blue smart. Use it with lithium, it charges correctly, something else is afoot.
Do you have it on adaptive and battery safe? Or a fixed absorption?
I have not changed any settings, this is just on the Profile that Victron have made for it.
Here is a good example, used it on weekend fishing and was pulling a lot of amps from battery so I put it on charge and then is showed completed after 2 hours
I have found that the charger goes into storage mode and continues to put out current. Have you tried leaving the charger on for another 24 hours to see how many more Amps the battery accepts?
I was getting almost the same Amps in storage mode as in absorbtion. I have since upgraded the cabling and found that the charger puts out more Amps in absorbtion mode but also quite a bit more when the charger is left on overnight. I find this strange and would have thought the battery would be full once the charger enters absorbtion mode and any current output would be minimal so as to keep the battery at 13.5 Volts.
Anyways, I, still trying to find out if it is normal or not.
Worth noting that the default Li-ion profile in these is particularly suitable for Victron’s LFP batteries, which want 14.2 bulk/absorb, while most 3rd-party LFP batteries need 14.4 bulk/absorb, so I’d suggest -when using with 3rd-party LFP- setting a custom profile based on the default li-ion, but with the bulk/absorb voltage changed to 14.4
