WattCycle 48V 100Ah 3U Server Rack Battery with Bluetooth & Active Balance

The new version of the 48V 100Ah 3U server rack battery features a touchable LCD screen and a 3A active balancer, supporting plug-and-play parallel to 20 racks to provide whole-home energy backup for days.

Active balancing is a cell management technique that moves charge from higher-voltage cells to lower-voltage cells, keeping every cell in the pack at a similar state of charge instead of simply shedding excess energy as heat. So your battery won't get hot as soon as you start using it, like before.

At a continuous 3A rate, this balancing is strong enough to correct cell drift during normal use and to support higher, safer charge currents.

Practically, active balancing means you retain more usable capacity over the life of the battery pack, accept faster and fuller charging without hitting early cutoffs, and experience slower capacity fade so the system delivers steady performance year after year.

Without active balancing, individual cells drift to different States of Charge (SoC) over repeated cycles, which means the battery’s usable energy is effectively capped by the weakest cell; that mismatch forces earlier charge or discharge cutoffs, limits safe charge rates, reduces usable capacity, and accelerates overall ageing.

If the balancing switch is on, balancing will begin when the maximum cell voltage differential in the battery pack exceeds this value and will end when it falls below this value.

For example, if you set the balancing start voltage differential to 10mv and the balancing stop voltage differential to 5mV, balancing will begin when the cell voltage differential exceeds 10mV and end when it falls below 5mV.

The recommended balancing start voltage differential is 0.005V for cells over 50Ah, and 0.01V for cells under 50Ah.

When the lowest cell voltage is below the set value of 2000mV, active balancing will not begin, even if the cell voltage differential exceeds the set value. The balancing current represents the continuous current used to discharge the high-voltage battery and charge the low-voltage battery during energy transfer. The maximum balancing current represents the maximum current during energy transfer, which does not exceed 3A.

The difference between 1A, 2A, and 3A active balance lies in the maximum current (amperage) they can use to transfer energy between battery cells.

In essence, a higher amperage rating means the active balancer can correct imbalances more quickly and handle larger cell capacities more effectively. All types use non-dissipative energy transfer methods, meaning they are more efficient and generate less heat compared to passive balancing systems.

Battery Pack Certifications: CE/FCC/UN38.3

For batteries with more than 50Ah, WattCycle provides a 5-year basic warranty. If you register a warranty on our official website, there is an extended 5-year warranty.

1. CAN/RS485 Ports: For external communication, like inverters.
2. RS232 Port: For internal communication or battery parallel use.
3. Bluetooth 5.0: Connected with the WattCycle App to monitor and control the battery status.
4. Display Screen: View real-time battery information and set communication protocols.

The WattCycle 48V 100Ah 3U server rack battery has the CAN/RS485 Communication Terminal (RJ45 port), which is designed to connect to the inverter and follows the CAN/RS485 protocol.
It also has the RS232 Communication Terminal (RJ45 port) following the RS232 protocol, for manufacturers or professional engineers to debug or service.

1. Main
The main interface displays the function options, including battery pack information, cell voltage, temperature, BMS alarm status, charge and discharge curve chart, settings and system information.

2. Pack
View the current system voltage, current, SOC, maximum and minimum cell voltage, temperature, balance switch and status, charge and discharge MOS status of the battery pack.

3. Cells
Check the voltage and temperature of the battery cell.

4. Alarm
Battery alarm, fault and abnormal information display to help engineers quickly analyze faults.

5. Chart
Display the voltage, current and SOC curve of the battery pack during operation.

6. Set
Set the communication protocol between the battery pack and the inverter, and the display language.

7. Product Information
Display the internal model and software version of the battery pack.

1.Comprehensive BMS Protections: It has over-charge protection and recovery, over-discharge protection and recovery, over-current protection and recovery in charging/discharging, temperature protection and recovery, current limiting function, and short-circuit current protection.

2.Ground Terminal: Connected to a ground wire to provide a safe discharge path for hazardous currents.

3.125A Air Circuit Breaker: When the battery current exceeds 125A for 1~2 minutes, the 125A air circuit breaker will be active.

1. Cell Overcharge Protection and Recovery
When the voltage of any cell is higher than the set value of the cell overcharge voltage, and the time of duration reaches the cell overcharge delay, the system enters the overcharge protection state, the charging MOS will turn off, and the battery cannot be charged.
After the cell overcharge protection, when the voltage of all cells drops below the cell overcharge recovery value, the overcharge protection state is released. It can also be released by discharge.

2. Overall Overcharge Protection and Recovery
When the overall voltage is higher than the overall over-voltage set value, and the time of duration reaches the overall overcharge delay, the system enters the overcharge protection state, turns off the charging MOS, and cannot charge the battery.
When the overall voltage drops below the recovery value of the overall over-voltage protection, the overcharge protection state is released, and it can also be released by discharge.

Compatible brands include:

Pylontech, LuxpowerTek, Growatt, Voltronic Power, INVT, Deye, SRNE, Solis, Megarevo, MUST, SMA, AiSWEI, SMK, SOFAR, SOROTEC, GoodWe, Victron Energy, PowMr, and others.For compatibility with other inverter brands, please contact us.

Up to 20 units can be connected in parallel.

Charging time depends on the power of your solar system. To fully charge the battery within one day (assuming more than 4.5 peak sun hours), at least 1600 W of solar panels is required.

Yes, the housing is removable. However, any unauthorised modification of internal components may void the warranty, and WattCycle assumes no liability for resulting damage.

Store the battery at 40%–60% state of charge, recharge every 3 months, and keep it in a temperature range of -10°C to 40°C. Do not store it fully charged or fully discharged.