Preen's two programmable DC power supply lines solve the same basic problem — a wide-ranging, precisely controllable DC source — at very different scales and in very different chassis. Picking between the ADG-L and ADG+ series is less about which is "better" and more about matching the physical footprint, power tier, and range-switching behaviour to what the application actually needs.
Two Different Architectures
The ADG-L series is Preen's compact programmable DC supply, built into a 3U chassis and spanning 5kW, 10kW, and 15kW power tiers. Several ADG-L models carry Auto Range output, which lets the unit reallocate its voltage/current envelope on the fly within a single model rather than forcing a choice between separate fixed-range variants — useful when a test program moves between different device voltages without swapping hardware.
The ADG+ series scales up to a different class of application entirely: a high-power, modular platform spanning 30kW, 50kW, 75kW, 100kW, and 300kW tiers, built for production, R&D, and system-level testing where the ADG-L's 3U footprint simply doesn't have the headroom. Each ADG+ power tier is built around its own family of models covering different voltage/current combinations within that power class.
Power Range and Footprint at a Glance
| Series | Power Tiers | Chassis | Auto Range Option |
|---|---|---|---|
| ADG-L | 5kW / 10kW / 15kW | Compact, 3U | Yes, on select models |
| ADG+ | 30kW / 50kW / 75kW / 100kW / 300kW | Modular, high-power rack platform | Model-dependent, by power tier |
When Auto Range Actually Matters
A fixed-range DC supply forces a tradeoff at the design stage: a model tuned for high voltage at moderate current, or high current at moderate voltage, but not both from the same unit. Auto Range ADG-L models remove that tradeoff for applications that move between different device voltages on the same bench — battery module testing across different pack voltages, or a lab that runs several DUTs with different voltage requirements through the same supply without re-provisioning hardware for each one. Where a test program is locked to one voltage/current combination for its lifetime, a fixed-range model is simpler to specify and doesn't cost anything in flexibility that won't be used.
Scaling to Higher Power
Both series support scaling past a single chassis, but the mechanics differ by design intent. The ADG-L's compact 3U format suits benches and smaller test cells where a handful of units side by side covers the requirement. The ADG+'s modular architecture is built from the ground up for scaling into production and system-level test setups — each power tier is designed to sit alongside identical units to build out the total power a larger DUT or multi-position line requires, without the physical footprint of racking dozens of smaller compact units.
Choosing Between ADG-L and ADG+
The decision generally comes down to three questions: how much power the application actually needs, how much rack or bench space is available, and whether voltage/current range flexibility matters more than raw power density. Lab and R&D work under roughly 15kW, especially where bench space is at a premium or the test program spans several device voltages, points toward the ADG-L, particularly an Auto Range model. Production testing, higher-power DUTs, or system-level integration above 30kW is squarely ADG+ territory, with the specific power tier chosen to match the DUT's demand with reasonable headroom rather than running a high-power unit near its ceiling continuously.