Hi all,

I have this same Esener 25.6v lithium battery paired with a 3KW Esener inverter(a MUST rebrand it seems) anyway, seems there is a lot of variance in the recommended bulk and float voltages. I purchased mine from GeeWiz - Esener 25.6V 2.56kWh 100Ah Lifepo4 Lithium Wall Mount Battery - GeeWiz, and on that page it specifies the following recommended voltages, which according to them came from the manufacturer:

Recommended User Settings When using a Esener Inverter
• Bulk Voltage 29.2V
• Float Voltage 27.3V
• Cut-off Voltage 20V

versus what the manual says:

• Bulk Voltage 27.6V-28.4
• Float Voltage 26.4V-27.2V
• Cut-off Voltage 22V

I am mega confused as to what to use and don't want to damage the battery!? Which ones are right?

Also, do you guys also notice a discrepancy between the battery voltage reading on the inverter versus at the battery terminals?

Thanks in advance

Edited October 18, 20232 yr by Ed S
spelling/typo

28.4 and you can ones a month bulk charge to 29v . 

27.2 to 27.4  float

23v to 24 cut of 

Are are safe volts that should not damage the cels and volts that I have been using for over an year . 

My esener always settles at night around 26.6v  as I only charge from solar . 

On my older inverter there were volts  difference between inverter and lithium more  like 1 volts when it was under high  load . But with the new inverter its closer . 

 

Thanks very much! It sounds like that is a good compromise :)

Ive set bulk and float on 27.6 v on my setup. And its been like that for some months. Yes i do cycle the battery every day. Discarge to 40% soc max.

On 2023/10/13 at 1:42 PM, GMAC said:

28.4 and you can ones a month bulk charge to 29v . 

27.2 to 27.4  float

23v to 24 cut of 

Are are safe volts that should not damage the cels and volts that I have been using for over an year . 

My esener always settles at night around 26.6v  as I only charge from solar . 

On my older inverter there were volts  difference between inverter and lithium more  like 1 volts when it was under high  load . But with the new inverter its closer . 

 

What is your battery type set to in your inverter settings? On my Esener, I do have a "Li" mode(lithium) and the manual encourages to set it to that when using a lithium battery. However, the problem with this mode, is that the inverter will ALWAYS stay at the set bulk charge voltage and won't ever come down to float, it's as if it ignores the float voltage setting altogether. Note that my inverter does not have comms for BMS, nor does my battery. I have since been advised to use "USE" after which it does indeed come down to float voltage(aka resting voltage for lithium, as it won't trickle charge like it does with lead acids).

If using the "Li" mode, would it be safe to set the bulk and float at the same voltage? I'm just worried that with "USE" mode it is a charging profile more aimed at lead acid batteries, and wonder if the charging algorithm could have an adverse effect on the lithium iron phosphate battery?

 

Many thanks!

i use a Axpert type inverter. and the battery setting is on USE. as i can set the float and bulk to whatever i want. and the bulk does have the timed bulk charge function aswell (not the equalize charge function).

also no comms between inverter and battery.

 

i also had alot of questions, and sat with multimeters and and and for days and hours. 

so i just bought a Victron smart shunt and a Raspberry, in loaded Solar assist. yes there is still flaws. but atleast i can try resolve this myself while i am not home, as i work out of country for weeks at end. 

 

even after installing the monitoring stuff, giving me a better idea of what is going on, and and and. i still run it on 27.6v. of bulk and float. 

and i play around ever so often with different settings to see what effect it has. 

again, i cycle the battery daily, so it doesnt sit at 27.6v the whole day, probably for 4 hours or so, and then solar decreases to where it starts using battery again.

21 minutes ago, Flouw said:

i use a Axpert type inverter. and the battery setting is on USE. as i can set the float and bulk to whatever i want. and the bulk does have the timed bulk charge function aswell (not the equalize charge function).

also no comms between inverter and battery.

 

i also had alot of questions, and sat with multimeters and and and for days and hours. 

so i just bought a Victron smart shunt and a Raspberry, in loaded Solar assist. yes there is still flaws. but atleast i can try resolve this myself while i am not home, as i work out of country for weeks at end. 

 

even after installing the monitoring stuff, giving me a better idea of what is going on, and and and. i still run it on 27.6v. of bulk and float. 

and i play around ever so often with different settings to see what effect it has. 

again, i cycle the battery daily, so it doesnt sit at 27.6v the whole day, probably for 4 hours or so, and then solar decreases to where it starts using battery again.

Thanks for the reply

I don't have the timed bulk charge function on mine, but do have the Equalisation feature which can be run periodically according to a set schedule. Is it safe to run that with these lithium batteries? Just to ensure that the BMS balances the cells from time to time..

I do have an app for mine where I can monitor and even set certain parameters, strangely I can't set voltages remotely, only source and charger priorities(and a bunch of other things I don't want to mess with)

How are you cycling your battery? Do you run off solar and when PV fades you use the battery until a certain cut-off point? What if load shedding gets in the way, and not leaving enough capacity to get through a load shedding schedule?

Also, what made you decide on running bulk and float at the same voltage?

2 hours ago, Ed S said:

Thanks for the reply

I don't have the timed bulk charge function on mine, but do have the Equalisation feature which can be run periodically according to a set schedule. Is it safe to run that with these lithium batteries? Just to ensure that the BMS balances the cells from time to time..

I do have an app for mine where I can monitor and even set certain parameters, strangely I can't set voltages remotely, only source and charger priorities(and a bunch of other things I don't want to mess with)

How are you cycling your battery? Do you run off solar and when PV fades you use the battery until a certain cut-off point? What if load shedding gets in the way, and not leaving enough capacity to get through a load shedding schedule?

Also, what made you decide on running bulk and float at the same voltage?

my previous inverter didnt have the bulk timed charge function. and the floating bug is pretty much in all the inverters/batteries that cant communicate. im not running  a big system. so i dont have to fast charge (less than 2 hours), so i set the bulk the same as float. 27.6 is safe. and its not in the upper curve of the voltage, so it wont run away with the PV system. 

i would not even use the equalization function, as i dont see the need for lithium. the esener battery BMS is apparently an active balancer, so it always balances. not only from a certain voltage. i cant give more details, as i have yet to open one to see. but i set my batteries to charge at 28.2v for 12 hours once a month. and it seems to be OK with that, lithium will only absort the power it needs, and you cant overcharge them, unless you over voltage them. do not charge them to the absolute max, and keep them there, they need to settle, otherwise it gets bloated and gas's

i do have PV on the roof yes, that charges and supports all the essentials the whole day, and at night i let the battery run down to 40% SOC by 06:00. which ever comes first, as PV starts producing from there, although not much, but has enough power left for another 4 hours untill either PV is enough, or Eskom is back online if its rainy. 

Solar assistant helps maintain the battery, has that function. so if the battery drains faster than the graph, it switches to grid untill everything catches up. i dont charge from Eskom at all. unless the weather is really bad. 

 

IF i had to install a system again, as an backup, or for someone else, and dont have the capability to read SOC, i would again set the bulk and float to 27.6. and forget about it. 

ill do some tests on a lower voltage for bulk and float, to see when the "floating bug" starts setting in. 

9 hours ago, Ed S said:

What is your battery type set to in your inverter settings? On my Esener, I do have a "Li" mode(lithium) and the manual encourages to set it to that when using a lithium battery. However, the problem with this mode, is that the inverter will ALWAYS stay at the set bulk charge voltage and won't ever come down to float, it's as if it ignores the float voltage setting altogether. Note that my inverter does not have comms for BMS, nor does my battery. I have since been advised to use "USE" after which it does indeed come down to float voltage(aka resting voltage for lithium, as it won't trickle charge like it does with lead acids).

If using the "Li" mode, would it be safe to set the bulk and float at the same voltage? I'm just worried that with "USE" mode it is a charging profile more aimed at lead acid batteries, and wonder if the charging algorithm could have an adverse effect on the lithium iron phosphate battery?

 

Many thanks

I would use li mode if it's available as it will not charge the battery all the time and so is more lithium friendly . 

I would then set bulk to 27.6v 

@Flouw Thanks for your reply! Good to know the Esener has an active balancer! Big plus

1.) Do you use the "USE" battery type?
2.) How do you go through the night with only a 2.56kwh battery? What is your base load at night?
3.) What's the reason for setting float the same as bulk? To overcome the float bug? Is it fine to float at 27.6(3.45V per cell) when resting voltage is said to be 27.2V(3.4V per cell)

@GMAC Thanks, I have tried the Li mode, but when in that mode, it seems to stay at the bulk voltage despite the battery being fully charged, it does not honour the setting for float and does not come down to that voltage, i.e. bulk set at 28V for example, float set to 27.2V. It will just stay at 28V on in the inverter. I know the battery's BMS will cut current and stop charging when full, but is it safe for it to just hang at 28V??

Thanks again all, tricky business this!

1 hour ago, Ed S said:

@Flouw Thanks for your reply! Good to know the Esener has an active balancer! Big plus

1.) Do you use the "USE" battery type?
2.) How do you go through the night with only a 2.56kwh battery? What is your base load at night?
3.) What's the reason for setting float the same as bulk? To overcome the float bug? Is it fine to float at 27.6(3.45V per cell) when resting voltage is said to be 27.2V(3.4V per cell)

@GMAC Thanks, I have tried the Li mode, but when in that mode, it seems to stay at the bulk voltage despite the battery being fully charged, it does not honour the setting for float and does not come down to that voltage, i.e. bulk set at 28V for example, float set to 27.2V. It will just stay at 28V on in the inverter. I know the battery's BMS will cut current and stop charging when full, but is it safe for it to just hang at 28V??

Thanks again all, tricky business this!

 

1. i have the inverter set to USE. 

2. only have essentials connected, i run from UTI from sunset to around 22:00. base loads that time is varying as the fridge goes on and off. but it consumes 6/7% per hour. solar assist helps me to maintain the battery. i choose to cycle the battery, as it makes space to harvest PV. the next day- i need to add another battery, as mine is fully charged by 10:00 in the morning already, and the PV system is then just idling. 

3. i set the float and bulk the same, as the float bug is a reality if your voltage doesnt go low enough, especially charging on PV. it only charges to float voltage. BUT, once the PV drops, it tops it off from Utility till it reaches the SOC maintainer. that is why i raised the float to where i want it to be.

the 3.4v resting voltage is exactly that. resting voltage. and what i have learned with the LiFePo4, Voltage doesnt tell you much.

i use to think my battery is almost empty after 4 hour load shedding, lights on, TV on. fridge running. till i fitted the Smart Shunt. then realized after a 4 hour outage, that my battery was still at least 50%. 

Thanks @Flouw

I'll look into the smart shunt and solar assist guides. How did you connect the Smart Shunt into the Pi? Just USB?

Are you using CSO as charge source priority? Actually, would you mind sharing your settings with me? Just the important ones like Source priority(SBU, SOL etc), charger source priority, back to grid voltage setting, back to solar/battery voltage setting, cut-off voltage etc

Many thanks

Hi. I am new to Lithiums. Just bought 2x Esener 25.6v and had it connected to my S2330 Sun solar inverter, Hybrid 24v 3kva. My inverter does not give me options to set bulk and float higher than 14. The person I bought it from, does not understand why settings does not go higher especially it being a 24v inverter. I then purchased a mppt solar charge controler so that I can at least set the bulk and float to 26. My 2x esener batteries are connected parallel powered by 2x 550w solar panels connected in series. I only have 1x 24v fridge connected to the load into the mppt controler, running all day and night and my wifi router connected to my inverter. At night my tv (150w) and twice a week the eco washing machine. My batteries are on 23 at 4am in the morning. I cannot understand why my batteries are so low every morning. Any advise will be greatly appreciated. 

Hallo

 

I am new and more interested in knowing and understanding the two items, I am aware it might have been discussed but I didn't have an opportunity to see it, so, bear with me and try yiur level best in assisting 

 

1. COMBINER BOX 4P

Why do i need 4P DC not 2P,whereas I will only be connecting only +and- using only two fuses, basically my system is designed to run on 2s2p, connecting the strings with Mc4 y, to the combiner box, it's 4pannels of 370W, voc 82.60v,and 22. 70A

 

 

2. Do i also need inline fuse between the pannels and combiner box, if so, how many, amps requirements 

 

My inveter is 102voc,50A,1 string

 

Thanks

Edited August 9, 20241 yr by Ma kwavo

5 hours ago, Ma kwavo said:

Hallo

 

I am new and more interested in knowing and understanding the two items, I am aware it might have been discussed but I didn't have an opportunity to see it, so, bear with me and try yiur level best in assisting 

 

1. COMBINER BOX 4P

Why do i need 4P DC not 2P,whereas I will only be connecting only +and- using only two fuses, basically my system is designed to run on 2s2p, connecting the strings with Mc4 y, to the combiner box, it's 4pannels of 370W, voc 82.60v,and 22. 70A

 

 

2. Do i also need inline fuse between the pannels and combiner box, if so, how many, amps requirements 

 

My inveter is 102voc,50A,1 string

 

Thanks

 

5 hours ago, Ma kwavo said:

1.COMBINER BOX 4P

If you do 2s2p without Mc4 y connector you will have 4 wires running to your combiner box( 4in 2out) 2 pos and 2 neg that is paralleled inside the combiner. If you use Mc4 y connector you will have 2 wires running to your combiner(2in 2out)already paralleled at y connector 1 pos 1 neg.

5 hours ago, Ma kwavo said:

2.Do i also need inline fuse between the pannels and combiner box, if so, how many, amps requirements 

You won't need inline fuses for 2p on your solar panels as your Imp is around 10.77A/ panel total 21.54A that you will hardly reach or for very short periods. Your panel series fuse rating is 20A so no you won't need series fuses. If you had 2s3p then yes the current in the array will be well above 20A(panel max series fuse)

14 minutes ago, TaliaB said:

 

If you do 2s2p without Mc4 y connector you will have 4 wires running to your combiner box( 4in 2out) 2 pos and 2 neg that is paralleled inside the combiner. If you use Mc4 y connector you will have 2 wires running to your combiner(2in 2out)already paralleled at y connector 1 pos 1 neg.

You won't need inline fuses for 2p on your solar panels as your Imp is around 10.77A/ panel total 21.54A that you will hardly reach or for very short periods. Your panel series fuse rating is 20A so no you won't need series fuses. If you had 2s3p then yes the current in the array will be well above 20A(panel max series fuse)

Well explained, so loud and clear

 

I salute

🙏🙏🙏

Hallo Guys(Helpers) 

 

WHAT IS A CYCLE

I since bought and connected my 24v Esenner Lithium battery last year(2023). It rated +-4000 Cycles

Its connected to a 3kva inveter. 

It underwent brutal knocks last year(2023),due to continuous loadshading, which might last sometimes 12hours a day. This year(2024),there was no power cuts till recently which is 4hours after two days. My load all combined does not exceed 1000w. 

 

I want to know, and understand how do i know a cycle, does one power cut of 2 hours with a load of 650w a cycle.? How will I know how many cycles my battery left? 

 

I am struggling to know, and I need to know so that i can prepare myself in time to get a new battery

 

Thanks

50 minutes ago, Ma kwavo said:

It rated +-4000 Cycles

If you do 1 cycle/day that equates to >10 years. The manufacturer dictates what is seen as 1 cycle and the battery bms keeps the count. It varies between manufacturers what the count logic would be as there is no industry standard as how it should be calculated. Logically 1 discharge/charge cycle should be 1 cycle. 

 

55 minutes ago, Ma kwavo said:

want to know, and understand how do i know a cycle, does one power cut of 2 hours with a load of 650w a cycle.? How will I know how many cycles my battery left? 

650w x 2 hours = 1300wh. Your battery capacity is 25.6v ×100ah = 2560wh so in 2 hours at 650w it should be 0.5cycles or 1 cycle depending on bms algorithm.

1 hour ago, Ma kwavo said:

It underwent brutal knocks last year(2023),due to continuous loadshading, which might last sometimes 12hours a day.

Lifepo4 cells are protected against low  discharge or over-charge by the bms so i don't think in your case if you have a good balanced battery that you have to be concerned. Moderate charge/discharge current is key to the longevity of your Lifepo4 battery stay in those parameters and your battery would last many years.