H&H, manufacturer of an impressive line of electronic loads, has developed the new SCL series especially for testing high-current DUTs such as fuel cells. This electronic Single Cell load can load a connected voltage source up to 1,200 A at a minimum input voltage of only 600 mV (standard models) or even from 0 V (SCL ZV).

This series is available in a 12V and a 40V model suitable for currents of 400A, 800A and 1,200A. For higher currents, multiple loads can be connected in parallel in a master – slave configuration. The different models are housed in a compact 19″ housing of only 2 U high.


The SCL series loads operate in the following modes; constant current (CC), constant voltage (CV), constant resistance (CR) and constant power (CP) and the following combined modes; CC+CV, CR+CC+CV, CP+CC+CV, CV+CC. In the modes CC, CV, CR, CP, the electronic loads can produce load profiles using the List function. Up to 300 settings with variable setpoints and ramp-up / ramp-down times are possible.

Furthermore the SCL series loads are standard equipped with a number of functions specifically belonging to high current DUTs. One of these is the determination of the internal DC resistance of the connected DUT. The determination of the internal resistance Ri is based on the principle specified in various standards for batteries and accumulators, for example DIN EN 61951, DIN EN 61960. In addition, the modulator function is suitable for defining a waveform on the load current in the frequency range from 0.1 Hz … 10 kHz as the basis for an impedance analysis.


The discharge function tests DUTs such as batteries, ultracaps and electrolytic capacitors etc. by discharging them in CC, CP or CR mode. The discharge function can be combined with the list function to enable pulsed discharge. IUa discharge (CC+CV discharge) is also possible: the test object is discharged with a constant current to a defined voltage. This voltage is then kept constant until a defined minimum current is reached. Stop criteria are charge, energy, time, current, voltage. During data logging, a follow-up time can be defined to observe the regeneration phase.

The electronic load is able to synchronously log data of voltage and current with a time stamp and store them internally. Up to 40,000 records are stored in a ring buffer and can be read out afterwards. After recording has been completed, the data can also be transferred to a USB flash drive. For processes with a measuring interval in the seconds range, storage can also take place directly on the USB flash drive.

Models Electronic Single Cell Load

SCL604 SCL1204 SCL1804
Maximum input voltage Vmax 40 V 40 V 40 V
Minimum input voltage Vmin 1) 0.6 V 0.6 V 0.6 V
Maximum current Imax 400 A 800 A 1,200 A
Maximum power 2) 600 W 1,200 W 1,800 W

Zero Volt Models

Maximum input voltage Vmax 12 V 12 V 12 V
Minimum input voltage Vmin 1) 0 V 0 V 0 V
Maximum current Imax 400 A 800 A 1,200 A
Maximum power 2) 600 W 1,200 W 1,800 W


For remote control, almost all common interfaces are available as standard. RS-232, USB, LAN, CAN, Analogue. GPIB is optional.

Open the datasheet for detailed specifications of this product.

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