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23-01-2025, 20:50
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#1
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Registered User
Join Date: Jan 2018
Location: HAWAII
Boat: CAL-2 30'
Posts: 232
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CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
I ordered 4 EVE Grade A 3.2v 314ah cells and a BK BMS. My charge sources are Pronautic 1240P, Victron MPPT and Orion 50A. One vendor warned not to charge these cells more than 3.45/13.8v so I was thinking of setting the BMS to stop charging there. What voltages should the charge sources be set to in order to avoid overcharging?
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23-01-2025, 21:37
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#2
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Registered User
Join Date: Sep 2019
Location: Lifeaboard
Boat: FP Lavezzi 40
Posts: 4,305
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by davenrino
I ordered 4 EVE Grade A 3.2v 314ah cells and a BK BMS. My charge sources are Pronautic 1240P, Victron MPPT and Orion 50A. One vendor warned not to charge these cells more than 3.45/13.8v so I was thinking of setting the BMS to stop charging there. What voltages should the charge sources be set to in order to avoid overcharging?
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That vendor talks bs. My buddy has an NPO producing powerwalls and commercial EVs and uses the new EVE MRBF31 which are the 314-316AH cells.
You can charge them 3.65V but best compromise is 3.50-3.55V.
So your parameter for JK is HVD 3.60V and LVC 2.8V.
Pronautic and MPPT put to 14.0V absorption 10min and 13.45V
The orion XS has 0 filtering and depending on alternator regulator can put out serious DC ripple that can overcharge the battery. If you have access to a oscilloscope and put it on the alternator output and check how much.
If you don't I would go on the save side and put the orion to 13.6V absorption and 13.4V float.
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23-01-2025, 22:21
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#3
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Registered User
Join Date: Jan 2018
Location: HAWAII
Boat: CAL-2 30'
Posts: 232
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Mahalo!
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23-01-2025, 22:33
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#4
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Registered User
Join Date: Jun 2024
Posts: 56
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
I have had pretty good luck with 14.2 volts, absorb for one hour. Seems to be the sweet spot. I did do a proper top balance though. 13.8 volts seemed to low for my cells. Was having balance issues but this was before top balancing.
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23-01-2025, 23:32
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#5
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Registered User
Join Date: Mar 2016
Location: San Francisco
Boat: Morgan 382
Posts: 3,669
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by davenrino
I ordered 4 EVE Grade A 3.2v 314ah cells and a BK BMS. My charge sources are Pronautic 1240P, Victron MPPT and Orion 50A. One vendor warned not to charge these cells more than 3.45/13.8v so I was thinking of setting the BMS to stop charging there. What voltages should the charge sources be set to in order to avoid overcharging?
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There is a 2 part answer here. The first part is easy. Absolutely under no circumstance set your *BMS* to stop charging at 13.8V. The BMS is a protection device, and it is the job of the *charger* to stop charging. If the BMS stops charging, the battery charge bus is disconnected, and that can cause issues with your alternator and electronics. A good voltage to set the BMS at is 14.7V or 14.8V. Those voltages are higher than you want to charge daily, but if something goes wrong and the BMS needs to stop charging there, it won't hurt your batteries.
The second part, what voltage to set your charger at, is more complicated. 13.8V is certainly very safe, and lots of people do that. More typical is 14.0V-14.2V. The sweet spot is going to depend on how much charge current is applied, and isn't a straightforward thing to figure. In general, if you charge to 13.8V, you will need an absorption cycle, and to hold it there for a while. There is a risk of 13.8V not being able to keep the battery in balance. If you charge to a higher voltage, the length needed of absorption cycle goes down. How much it goes down depends on the charge current.
Now, with that said, if you were to charge to 14.0V-14.2V with either now absorption or a fairly short absorption, your batteries will be better than 98% charged, you won't be risking overcharge, and there is no harm in not fully charging them. So, that is my recommendation.
__________________
-Warren
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26-01-2025, 12:37
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#6
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Registered User
Join Date: Jan 2018
Location: HAWAII
Boat: CAL-2 30'
Posts: 232
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Mahalo.
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27-01-2025, 04:51
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#7
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Registered User
Join Date: Apr 2016
Location: SE Asia, for now
Boat: Outremer 55L
Posts: 4,173
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by wholybee
There is a 2 part answer here. The first part is easy. Absolutely under no circumstance set your *BMS* to stop charging at 13.8V. The BMS is a protection device, and it is the job of the *charger* to stop charging. If the BMS stops charging, the battery charge bus is disconnected, and that can cause issues with your alternator and electronics. A good voltage to set the BMS at is 14.7V or 14.8V. Those voltages are higher than you want to charge daily, but if something goes wrong and the BMS needs to stop charging there, it won't hurt your batteries.
The second part, what voltage to set your charger at, is more complicated. 13.8V is certainly very safe, and lots of people do that. More typical is 14.0V-14.2V. The sweet spot is going to depend on how much charge current is applied, and isn't a straightforward thing to figure. In general, if you charge to 13.8V, you will need an absorption cycle, and to hold it there for a while. There is a risk of 13.8V not being able to keep the battery in balance. If you charge to a higher voltage, the length needed of absorption cycle goes down. How much it goes down depends on the charge current.
Now, with that said, if you were to charge to 14.0V-14.2V with either now absorption or a fairly short absorption, your batteries will be better than 98% charged, you won't be risking overcharge, and there is no harm in not fully charging them. So, that is my recommendation.
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Depending on the BMS, stop charging as the OP writes probably means that the BMS sends a stop charge signal to connected equipment and has nothing to do with disconnecting the battery, which would be a separate event.
Nothing wrong with 13.8V as a charging voltage and all that is needed is to let it continue charging at that voltage until the current tails off to 2.5% of battery capacity. That’s pretty much 100% SOC. No need to charge to 14.2V or anything like that. BMS disconnect can be set to 14.5 or 14.6 - doesn’t really matter as your battery should never get that high as your stop charge events should trigger well before then.
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27-01-2025, 06:13
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#8
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Registered User
Join Date: Sep 2019
Location: Lifeaboard
Boat: FP Lavezzi 40
Posts: 4,305
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by User 09
I have had pretty good luck with 14.2 volts, absorb for one hour. Seems to be the sweet spot. I did do a proper top balance though. 13.8 volts seemed to low for my cells. Was having balance issues but this was before top balancing.
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How big is your bank?
14.2V with 1h absorption will overcharge your cells if you don't have > 1000AH capacity.
If it has a good top balance no more then 15 till max 30min is needed.
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27-01-2025, 06:23
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#9
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Registered User
Join Date: Sep 2019
Location: Lifeaboard
Boat: FP Lavezzi 40
Posts: 4,305
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by fxykty
Depending on the BMS, stop charging as the OP writes probably means that the BMS sends a stop charge signal to connected equipment and has nothing to do with disconnecting the battery, which would be a separate event.
Nothing wrong with 13.8V as a charging voltage and all that is needed is to let it continue charging at that voltage until the current tails off to 2.5% of battery capacity. That’s pretty much 100% SOC. No need to charge to 14.2V or anything like that. BMS disconnect can be set to 14.5 or 14.6 - doesn’t really matter as your battery should never get that high as your stop charge events should trigger well before then.
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It's a JK BMS and initial charge and 1st month should go to 14.0 or 14.2V minimum, then you can start to reduce and test if 13.8V keeps the top charge or if you need 14.0 or 14.2V to do so. With a JK BMS with 1 or 2A active balancer he can definitely go to 13.8V as this also balances in the knee during discharge so enough time to keep to balance.
Agree I would stay with HVD at 3.6V as also a HVD shouldn't be any problem for your system or alternator but prevents you battery from damage.
I have the BMV712 as last resort cut off on 14.7V incase BMS fails.
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27-01-2025, 11:00
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#10
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Registered User
Join Date: Jan 2018
Location: HAWAII
Boat: CAL-2 30'
Posts: 232
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by CaptainRivet
How big is your bank?
14.2V with 1h absorption will overcharge your cells if you don't have > 1000AH capacity.
If it has a good top balance no more then 15 till max 30min is needed.
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Just 1 12v 314ah battery.
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27-01-2025, 11:55
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#11
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Registered User
Join Date: Sep 2019
Location: Lifeaboard
Boat: FP Lavezzi 40
Posts: 4,305
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by davenrino
Just 1 12v 314ah battery.
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And JK BMS with active balancing so run the bank the first month at 14.2V absorption and 30min time with solar and shorepower charger so the cells run properly in and JK creates a proper top balance. After the 1st month reduce to 13.8V absorption with 15min and watch for the first week if the deviation at 13.8V growth, if it does go to 30min absorption. If not you are set.
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27-01-2025, 15:24
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#12
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Registered User
Join Date: Jan 2018
Location: HAWAII
Boat: CAL-2 30'
Posts: 232
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Thanks again!
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06-02-2025, 09:52
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#13
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Registered User
Join Date: Jun 2024
Posts: 56
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
Quote:
Originally Posted by CaptainRivet
How big is your bank?
14.2V with 1h absorption will overcharge your cells if you don't have > 1000AH capacity.
If it has a good top balance no more then 15 till max 30min is needed.
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300 amp hour bank. My charger is a 50 amp Victron charger so less than .2C. My BMS is passive balance. Taper current is less than 2amps at the end of the one hour absorb cycle and cell delta starts to creep above 20 mA. I have charger set to float at 13.4 at this point if im not around to turn off the charger.
Normally i just turn off the charger when my BMV-712 says the batteries are around 95-98%. Once every month and a half, give-or-take i let it charge to 100% as described above. The highest voltage cells are staying under 3.6 volts.
I'm curious what would be the definition of 'overcharge' for lithium?
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07-02-2025, 10:10
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#14
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Registered User
Join Date: Mar 2012
Location: Michigan/Bocas del Toro Panama
Boat: Corbin 39
Posts: 271
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
I hesitate to get involved in this subject. I have a Pronautic1230 on my boat and I very rarely us it to charge my LiFePo4 batteries.
The first thing you should know is that the Pronautic chargers don't have a separate voltage sence wire, so there is no way they can be trusted regulate charging at a precise voltage.
I have a separate audible voltage alarm wired directly at the battery. When I do use this AC charger I shut it off as soon as I reach the set voltage. Setting the charger at 13.8 reduces the amperage going in a slows the charging time considerably. I usually set in the low 14 range. This works when I need to charge up at dock on cloudy day, but obviously won't help with balancing.
There is no setting on a Pronautic charger that is safe to leave LiFePo4 batteries charging on unattended.
My Victron solar chargers are networked to a Victron smart shunt that can accurately read what voltage and current is going into the batteries. With this setup anything 13.8 and above will work, but you need to set the absorption to stop when when the current tappers down to a fraction of the capacity. This can be done with tapper current settings in the advanced section of the Victron charger profiles.
Let the criticism begin. This is just my humble opinion.
I'm one of the very few people on this forum willing to put my actual name on the top line of my posts
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07-02-2025, 16:01
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#15
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Registered User
Join Date: Mar 2012
Posts: 9
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Re: CUSTOM CHARGE PROFILE FOR EVE 314 AH CELLS?
I always run my alternator and other charging systems through a lead acid starting battery. I use a Renogy DC to DC charger to isolate my lifepo4 batteries from the lead acid battery. The DC to DC charger will charge the Lifepo4 batteries when there is excess power available from any of the charging systems coming through the lead acid battery. I set my Renogy charge voltage at 14.2 for the 12 volt Lifepo4 batteries. At that voltage, the Overkill bluetooth app will show a 100% charge on the BMS when it stops charging.
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