Don't charge your lithium batteries 100%

[Two on Tour]

How many makes of LiFePO4 have a BMS with this facility? Not many I suspect, my Relion doesn’t. Perhaps those with these remote control BMSs could say which makes have them.

I'm running a JK-B2A8S20P BMS which has an on/off switch.

 

[peterc10]

How many makes of LiFePO4 have a BMS with this facility? Not many I suspect, my Relion doesn’t. Perhaps those with these remote control BMSs could say which makes have them.

My KS Energy batteries do not have the ability to change any BMS settings. Only used to show me what state they are at.

 

[bigtwin]

How many makes of LiFePO4 have a BMS with this facility? Not many I suspect, my Relion doesn’t. Perhaps those with these remote control BMSs could say which makes have them.

I, and jongood, have a fully configurable BMS in our LiFePo4 batteries from Life Batteries. We can, independently, isolate the charge inputs and the discharge outputs.

Ian

 

[Pausim]

I, and jongood, have a fully configurable BMS in our LiFePo4 batteries from Life Batteries. We can, independently, isolate the charge inputs and the discharge outputs.

Ian

They look good value.

 

[bigtwin]

They look good value.

They are, and great after sales support and warranty too.

If you let him know your intended use, he’ll configure the BMS accordingly.

Ian

^{_{Subscribers  do not see these advertisements}}

 

[Ingwe]

Whether it is safe to leave a charger permanently connected and lithium batteries at 100% is down to the type of charger used. If you have done a straight battery swap and are using the same ‘dumb’ charger that was designed for lead acid, then it will be detrimental to the lithiums as it can not switch to the lower float profile when the batteries are charged - this will result in overcharge and ultimately damage to the batteries.

If you are using a dedicated lithium battery charger, or an ‘intelligent’ one that can be switched to a lithium profile you will be fine.

The ability to select lithium charge profile is going to be available on most modern solar charge controllers and it will be there on all MPPT chargers.

Thank you for this reply; it seems to deal exactly with the issue I have. The van is kept indoors so no solar. I have 2x110ah lithium batteries and a Victron IP22 charger. The tracker and alarm take current from the hab battery and this is kept charged with a Battery Master.
But we’re planning a trip away for 5 weeks and want to ensure that, on our return, the cab battery is charged enough to start the van. My reading of dawsey post #29 suggests that I should be fine leaving the IP22 on mains for the 5 weeks duration.
Ordinarily, when we’re here, we leave the van for sometimes 2-3 weeks without charging and things are fine but the voltage of the cab battery is on the low side at about 12.4v. So feel happier leaving it on charge for the 5 weeks.
Reassured too by the Victron manual which says that in ‘Storage‘ mode it tops up the leisure batteries only weekly, which suggests to me that there is little risk of overcharging.