Description
Low voltage and very high current is a niche of its own. The Keysight RP7931A power system, a member of the RP7900 family, is a bidirectional DC unit rated 20 V, ±400 A and 5 kW. It runs from three-phase 200/208 VAC, and Lost in HCM lists it for rental and sale.
What 20 V and ±400 A really mean
Voltage and current are separate limits, and the 5 kW rating caps their product. A full 20 V at 400 A would be 8 kW, so you cannot use both maximums together. Instead, 400 A is available up to 12.5 V. Raise the output to 20 V and the current ceiling falls to 250 A.
Therefore, list the real voltage and current pairs of your test before you request a quote. Cells, packs and low-voltage converters often sit near the high-current corner.
Source and sink in one chassis
The system works as a two-quadrant source and a regenerative electronic load. It can push current into a device, then absorb current from it. Regeneration returns the absorbed energy to a compatible facility supply, rather than burning all of it as heat in a load bank.
That saves cooling effort on long cycles with the Keysight RP7931A power system. However, the site must allow energy to flow back, so your electrical team should approve the installation first.
Work this class of system suits
- Low-voltage DC converters and bidirectional power stages.
- Cell and pack work for batteries, once a safety review is done.
- Automotive and industrial labs that test low-voltage subsystems.
- Production and endurance stations that plan for throughput and result storage.
The instrument alone does not prove compliance with an automotive transient standard. Instead, turn the written procedure into voltage, current, timing, fixture and protection needs.
Safety and setup notes
Qualified staff should set up isolation, energy discharge and emergency-stop steps. Start with conservative limits, and verify both source and sink behavior against your test plan. For batteries, review the chemistry, the state of charge, the precharge and the fault current. Battery-emulation software is a separate item, so name it if you want it.
Request the Keysight RP7931A power system
Lost in HCM supplies the unit and arranges service on request, while SMK Vietnam only hosts the listing. A rental suits a validation program or a pack-testing project, and a purchase suits a lab with steady demand. Please request a quote from Lost in HCM with your dates, ranges, interfaces and delivery city. You can also browse other power supplies, visit the Keysight website, or contact SMK Vietnam.
RP7931A questions
Why does the current fall below 400 A at 20 V?
Rated power sets the limit. Divide 5 kW by 20 V and you get 250 A, so the full 400 A needs 12.5 V or less.
What does my site need to provide?
It needs three-phase 200/208 VAC input. It must also accept the regenerative energy, which your electrical team should confirm.
Does the quote include battery-emulation software?
Not by default. List any software, cables and fixtures you want, because the quote includes only named items.
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