Resetting Cell Imbalance – Renogy 48V Lithium
Bulletin Type:
Bulletin #(s):
Job Code(s):
Flat Rate(s):

Publication Date:

SRP

Make(s):

Jayco, Entegra Coach

Model(s):

Terrain (19Y)
Solstice LI (21BL)
Swift LI (20AL, 20DL, 20TL)
Launch (19Y)
Expanse LI (21BL)
Ethos LI (20AL, 20DL, 20TL)

23-118

If affected unit has warranty
remaining, submit your claim
following the normal process

November 2023

Model Year(s):

2021-2024

Renogy 48V Lithium Batteries have cell imbalance caused by over-discharging the
battery.

Incident:

2021-2024 Jayco Terrain, Solstice LI, Swift LI; 2021-2024 Entegra Coach Launch,
Expanse LI, Ethos LI with renogy 48V Lithium system

Affected Units:
Parts List:

N/A

Misc. Tools & Supplies:

Shore Cord

CELL IMBALANCE INSPECTION
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Cell imbalance refers to a condition in which individual cells within a battery module have variations in their
electrical characteristics, such as voltage, capacity, or internal resistance. These variations can lead to
unequal performance among cells, potentially impacting the overall performance, safety, and longevity of
the battery system.
To catch cell imbalances, we need to observe them at a different reference point and not when the
batteries are fully charged. Fully charged LFP cells have an acceptable cell voltage differential that can grow
due to chemical variability, aging of the cell, and balancing, and be perceived as widest in the fully charged
process but not necessarily indicative of a cell imbalance. Therefore, you also won't find balancing occurring
during the end charge process. Balancing occurs in the recharging process.
When reviewing the Samkoon screen, there are several parameters which will require a mandatory
stoppage of this inspection and repair procedure. Immediately contact Patrick Distribution (1-800-621-2278
or email renogy[email protected]) for approval to replace the lithium battery.
WARNING: Do not attempt to charge the battery with the following conditions:
If the voltage difference between the min and max cell voltage is greater than 800mv.
If the battery total voltage is less than 32V.
If the max cell reads 8,000mV or similar.
If the min cell is under 2,000mV.

23-118_SRP Resetting Cell Imbalance

November 2023

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When determining cell imbalance, the charge source should be disconnected and the battery idle to
observe the actual voltage difference gap between the maximum volt cell and the minimum volt cell. Cell
imbalance is determined when the differential has grown beyond 300mV.
o Note: At 500mv cell differential the Samkoon will report a Level 1 warning and at 800mv cell
differential the Samkoon will report a Level 2 protection. Only when the cell differential has been
closed to below 300mv will the error on the Samkoon clear.

If the Max Cell is above 8000mV or the Min Cell is
below 2000mV, the battery is likely compromised
and will require replacement.

RESETTING CELL IMBALANCE
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The only way to begin clearing cell imbalance is by having a stable charge source connected and ensuring
the battery is not in any other alarm state such as overvoltage. The balancing algorithm is only carried out
during charging, triggered when both the following conditions are met:
1. Single cell voltage reaches 3.4V
2. The voltage difference between cells is above 60mV.
When the balancing starts, the cell(s) with high voltage will be discharged at 50mA. The balancing will be
ON for 1 sec, then OFF for 1 sec. As long as both the above conditions are met, the balancing cycle will be
carried out intermittently. It can't be a continuous process, to avoid overheating of the resistor in balancing
circuit.

INSTRUCTIONS:
1. Review the Samkoon screen to verify the system is not any alarm state – warning or protections

Displays Charging or
Discharging
Normal/Fault Message
Battery Operation
Status

2. With the lithium system operational and clear of any faults:
A. Discharge the system to below 53.0V.
B. Let the battery sit idle for 10-15 minutes.
C. Observe and note the Total Voltage, Max_Volt and Min_Volt.
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November 2023

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3. Change inverter settings:
A. Press SET button on Inverter to open parameter settings
B. Press UP or DOWN and go to Parameter #9 and then press ENT button
C. Parameter setting will begin to flash, then change to 53.6V.
D. Press ENT button to save setting
E. Press UP or DOWN and go to Parameter #28 and then press ENT button
F. Parameter setting will begin to flash, then change to 5A.
G. Press SET button to exit setting menu
4. Connect the unit to an external 120VAC (up to 30A) power source.
5. Continue to charge with shore power for an extended amount of time.
A. NOTE: Dependent on the lithium battery condition, balancing may take 1-2 days.
6. To observe the cell imbalance differential gap closing, discharge the battery to the same Total Voltage in
Step 2 and compare the cell differential. It should be observed that the cell differential should be closer as
this cannot be seen when the battery is fully charged.
A. NOTE: Repeat Steps 2-5 until the cell differential has closed completely and/or until the Cell
Imbalance error has cleared.

Jayco’s sole obligation under our limited warranty is to repair or replace defective materials and/or workmanship deemed our responsibility as determined
by Jayco in our sole discretion. Jayco reserves the right to use new and/or remanufactured parts or materials of similar quality to complete any work, and to
make parts and/or design changes as appropriate without notice to anyone. Jayco designs and/or materials changes are done without obligation to
incorporate such changes in previously manufactured product. Jayco makes every reasonable effort to ensure field remedies will not adversely affect
performance and/or safety of the unit. This field remedy is not intended to extend to future performance of this RV, or any of its materials, components or
parts beyond the standard warranty period. The RV owner’s obligation to notify Jayco, or one of its independent, authorized dealers, of a claimed defect
does not modify any obligation placed on the RV owner to contact Jayco directly when attempting to pursue remedies under state or federal law.
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903 South Main Street • P.O. Box 460 • Middlebury, IN 46540

23-118_SRP Resetting Cell Imbalance

November 2023

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