Epever controller 90% 20% soc charge perameter Q

Toejam

New Member
Joined
May 27, 2021
Messages
2
Trying to get my head around the contoler settings on epever tracer 4210an have done alot of reading just want to make sure Im on the right path..😀
My system.
2x 200w pv
Diy 4s eve 280ah lifepo4 (new)
Daly 100a bms.
Epever tracer 4210an 40amp.
Communication ebox bluetooth

Ive built the battery and am replacing AGMs.
Would just like to confirm the settings Im planning on using so I dont blow anything up
Planning on 90% 》 20% soc if thats the correct terminology
Android app settings:
First numbers are what the epever have as default lifepo4 settings bold numbers are my planned changes..

Boost duration... 120 is this OK?
Equalise duration... 120 change to 0
Temp compensation ...0
Over volt disconect V ...15.6v change to 14.7v
Over volt reconnect V ....14.6v change to 13.7v
Equalise charging voltage V...14.5v change to 0v
Boost charging V... 14.5v
Float charging V...13.8v
Boost re connect charge V...13.2v
Charging limit voltage V...14.6v ..change to 13.4v
Discharge limit voltage V...10.6v..change to 11.6v
Low voltage disconnect V ...11.1v change to 11.6v
Low voltage reconnect V...12.8v
Under voltage warning V...12v
Under voltage reconnect V... 12.8v
Low temp charge limit degC... -35 change to 5
Low temp discharge limit deg C...-35 change to 5

Any feed back greatly appreciated. Thanks
 

jnrhome

Solar Enthusiast
Joined
Feb 2, 2021
Messages
102
I have a 6415an. My settings and the journey I’ve taken getting my lifepo4 bank dialed in are chronicled here. For you, I’d adjust the boost duration to 30, and review the manual which explains the voltage configuration flow. For example, your low voltage disconnect/reconnect settings above will have the controller in a low voltage warning until the battery gets to 100% SOC. That warning is meant to let you know that the battery is under perhaps 5% or lower SOC.
 

DThames

Photon Sorcerer
Joined
Nov 22, 2019
Messages
1,440
My system is for emergency power and I do want to take it easy on my battery. I set my boost to 3.5v per cell. Solar charging is often pretty low C so by the time you get 3.5v per cell you will be pretty close to full charge, so no need to push the voltage any higher. I also set my float just below or at the settling voltage so the battery would just sit idle for the most part. If the system is loaded, it quickly drops to the boost reconnect so it will go back to fully charged after use. About the boost duration, when the battery is held at a constant voltage, the current drops off as the cells approach full charge (for that voltage). So the current will slowly go towards zero. Charging such a large battery with your low power (400w) boost duration might not matter but 120 minutes would not be a problem.

I have a RS-485 to USB monitor cable and use the Solar Station Monitor software which has a dashboard that lets you see what is going on very well. I have an old junk laptop connected to it an then use Windows Remote Desktop so I can see it from my computer in the house. You can see the charging curve, etc and really tell if it is doing what you would expect.
 

mikefitz

Solar Addict
Joined
May 28, 2020
Messages
887
Charging such a large battery with your low power (400w) boost duration might not matter but 120 minutes would not be a problem.
It may lead to over stress. With small solar systems, charging at fractional charge, the battery will be almost fully charged when the boost voltage is reached. The boost duration of 120 minutes will just stress an already charged pack of cells.

Many of the settings on the Epever relate to the load outputs, as far as charging is concerned only the values below are relevant.

The Epever works as follows:
When it wakes up, it starts the charge cycle and charges at the maximum power the panels can deliver until the battery volts equal Boost Volts.
It then holds the battery at the constant boost volts voltage for Boost Duration
At the end of Boost Duration period, drops to Float Voltage.
If the volts drop below Boost reconnect volts, it restarts the charge cycle again.

With the cells we are considering, any voltage above 3.4v per cell will eventually fully charge that cell. That's 13.6 volts for a 12v pack. So any voltage you select above this will charge to full.
Its considered that a value of 14 volts is a reasonable value if you are not too concerned about the rate at which the final few % of capacity are put into the battery.
To determine when the cells are fully charged its accepted if charging at 14.6 volts, the 4 cell battery is full when the current falls to 0.05C or 14 amps.
If charging at a lower voltage , say 14 volts, the fully charged current would be a fall to 7 amps.

The setting for float volts depends on the application. If the battery is supplying loads through the day, then a high value, 13.6, will allow solar to supply loads without depleting the battery, (once the battery is charged).
In a standby application, a low value , below 13.4 volts would be preferred.
Due to tolerances and calibration these valued may need confirmation by testing, as even 0.05v variations have an effect.

Comments on the Epever settings:
Boost duration... 120 is this OK?
I suggest a low value, 10, or 0
Boost charging V... 14.5v
Lower voltages will stress less and make very little difference to charge time. Victron now recommend 14.2v for their batteries.
Float charging V...13.8v
Too high in my view, 13.5v if you think a float is needed. Could be in the range 13.2 to 13.3, anything above this will charge to almost full.
Boost re connect charge V...13.2v
Must be lower than any float value.

Most of the other Epever settings relate to the load terminals and will not in any way control the charging and discharging of the battery at the battery terminals. The Epever is a charger and load control unit via its load terminals.

Planning on 90% 》 20% soc
I dont know why this is considered to be the 'ideal range' when for most hobby systems its somewhat impractical.
Its a bit of a problem implementing this without some sort of coulomb counter unit monitoring the amp hours in/out the battery, and controlling the charging and discharging paths. Using voltage alone is very approximate and the terminal voltage will vary with load, 0.1 of a volt can cover a wide range of capacity.

In practice if the resting voltage is below 12.5v its getting low, above a resting 13.4 volts its nearly full.

Mike
 

Roly

New Member
Joined
Feb 4, 2021
Messages
20
It may lead to over stress. With small solar systems, charging at fractional charge, the battery will be almost fully charged when the boost voltage is reached. The boost duration of 120 minutes will just stress an already charged pack of cells.

Many of the settings on the Epever relate to the load outputs, as far as charging is concerned only the values below are relevant.

The Epever works as follows:
When it wakes up, it starts the charge cycle and charges at the maximum power the panels can deliver until the battery volts equal Boost Volts.
It then holds the battery at the constant boost volts voltage for Boost Duration
At the end of Boost Duration period, drops to Float Voltage.
If the volts drop below Boost reconnect volts, it restarts the charge cycle again.

With the cells we are considering, any voltage above 3.4v per cell will eventually fully charge that cell. That's 13.6 volts for a 12v pack. So any voltage you select above this will charge to full.
Its considered that a value of 14 volts is a reasonable value if you are not too concerned about the rate at which the final few % of capacity are put into the battery.
To determine when the cells are fully charged its accepted if charging at 14.6 volts, the 4 cell battery is full when the current falls to 0.05C or 14 amps.
If charging at a lower voltage , say 14 volts, the fully charged current would be a fall to 7 amps.

The setting for float volts depends on the application. If the battery is supplying loads through the day, then a high value, 13.6, will allow solar to supply loads without depleting the battery, (once the battery is charged).
In a standby application, a low value , below 13.4 volts would be preferred.
Due to tolerances and calibration these valued may need confirmation by testing, as even 0.05v variations have an effect.

Comments on the Epever settings:

I suggest a low value, 10, or 0

Lower voltages will stress less and make very little difference to charge time. Victron now recommend 14.2v for their batteries.

Too high in my view, 13.5v if you think a float is needed. Could be in the range 13.2 to 13.3, anything above this will charge to almost full.

Must be lower than any float value.

Most of the other Epever settings relate to the load terminals and will not in any way control the charging and discharging of the battery at the battery terminals. The Epever is a charger and load control unit via its load terminals.


I dont know why this is considered to be the 'ideal range' when for most hobby systems its somewhat impractical.
Its a bit of a problem implementing this without some sort of coulomb counter unit monitoring the amp hours in/out the battery, and controlling the charging and discharging paths. Using voltage alone is very approximate and the terminal voltage will vary with load, 0.1 of a volt can cover a wide range of capacity.

In practice if the resting voltage is below 12.5v its getting low, above a resting 13.4 volts its nearly full.

Mike
Hi Mike. I've noticed you seem to post solutions to most epever controller questions. Regarless of settings could you do a breakdown of what each parameter refers to (in MT50 order)? You mention that most are for the load control but it might be helpful to everyone (inc me) if they understood what each one meant and the procedure the controller goes through from waking up. I've searched all over youtube and haven't found anything that does this for epever
 

MikeBou

New Member
Joined
Mar 6, 2021
Messages
31
Trying to get my head around the contoler settings on epever tracer 4210an have done alot of reading just want to make sure Im on the right path..😀
My system.
2x 200w pv
Diy 4s eve 280ah lifepo4 (new)
Daly 100a bms.
Epever tracer 4210an 40amp.
Communication ebox bluetooth

Ive built the battery and am replacing AGMs.
Would just like to confirm the settings Im planning on using so I dont blow anything up
Planning on 90% 》 20% soc if thats the correct terminology
Android app settings:
First numbers are what the epever have as default lifepo4 settings bold numbers are my planned changes..

Boost duration... 120 is this OK?
Equalise duration... 120 change to 0
Temp compensation ...0
Over volt disconect V ...15.6v change to 14.7v
Over volt reconnect V ....14.6v change to 13.7v
Equalise charging voltage V...14.5v change to 0v
Boost charging V... 14.5v
Float charging V...13.8v
Boost re connect charge V...13.2v
Charging limit voltage V...14.6v ..change to 13.4v
Discharge limit voltage V...10.6v..change to 11.6v
Low voltage disconnect V ...11.1v change to 11.6v
Low voltage reconnect V...12.8v
Under voltage warning V...12v
Under voltage reconnect V... 12.8v
Low temp charge limit degC... -35 change to 5
Low temp discharge limit deg C...-35 change to 5

Any feed back greatly appreciated. Thanks
From support@epsolarpv.com

Please set the Equalize Charging Voltage to be as same as the Boost Charging Voltage, includes the Equalize Charging Time.

Best Regards
Bianca Chen
EPEVER Support
 
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