Buying a Sola power supply usually means you have a specific industrial load that needs clean, reliable DC conversion and you cannot afford to guess wrong. The catalog spans compact DIN-rail modules and high-current bench-style units to a full UPS, and the differences between them matter more than marketing copy suggests. Output voltage range, continuous amperage, input frequency tolerance, and physical form factor are the specs that determine whether a unit slots into your existing panel or forces a redesign.
Across the eight models listed here, owner feedback consistently separates units that run quietly under sustained load from those that throttle or buzz when pushed near their rated output. We compared published datasheets, real-world pricing, and buyer reports to rank each one by where it delivers the most value for its intended application.
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Top 3 picks at a glance
Quick Picks
| Product | Best for | Price |
|---|---|---|
| SDP4-24-100RT | General industrial 24 VDC loads | $169.99 |
| SDP2-24-100T | Small control circuits on tight budgets | $178.99 |
| SDP1-48-100T | Low-draw 48 VDC telecom feeds | $149 |
| SDN2.5-24-100P | Mid-range 24 VDC panel integration | $202.92 |
| SDN20-24-100C | High-current 24 VDC single-phase systems | $299 |
| SDN5-24-100P | Medium-current 24 VDC with wide frequency tolerance | $359.99 |
| SDP1-48-100T DIN Rail | DIN-rail 48 VDC automation panels | $207.30 |
| SDU500 | Uninterrupted 120 VAC backup | $699 |
How We Picked
We weighted four criteria: output current headroom relative to price, input frequency range (narrower tolerance means fewer installation environments), form factor and mounting flexibility, and long-term owner reliability reports. A unit that costs more per amp or only accepts a single 60 Hz input will not earn a high spot no matter how well it is marketed.
The 8 Best Sola Power Supply in 2026
Sola/Hevi-Duty SDP2-24-100T DC Power Supply
This compact 24-28 VDC unit at 2.1 Amp is designed for small control panels and relay circuits. Owners appreciate its wide input frequency tolerance of 43-67 Hz, which lets it operate on older generators or variable-frequency sources without nuisance shutdowns. It is also one of the more affordable entry points in the Sola DC line.
- Pro: Accepts a broad input range (43-67 Hz), useful in locations with unstable AC mains.
- Pro: Low cost per unit for low-amperage 24 VDC applications.
- Con: 2.1 Amp ceiling means it cannot support even moderately sized loads without headroom concerns.
Skip this if your load exceeds roughly 1.5 A continuous; you will sacrifice longevity by running near full rated output.
Sola/Hevi-Duty SDN5-24-100P DC Power Supply
At 5 Amp output on a fixed 24 VDC rail, this unit targets medium-density I/O racks and multi-sensor installations. The 47-63 Hz input window covers standard North American and most international mains. Its enclosure and thermal design handle sustained loads better than the smaller SDP-series siblings.
- Pro: 5 A continuous rating supports multiple solenoid or valve loads simultaneously.
- Pro: Narrow 47-63 Hz tolerance indicates a well-regulated design that stays stable on clean mains.
- Con: Priced at $359.99, it costs more per amp than several alternatives in this roundup.
Skip this if you do not need 5 A; the SDN2.5-24-100P delivers similar build quality at a lower price for half the current.
Sola/Hevi-Duty SDN2.5-24-100P DC Power Supply
Positioned as the balanced mid-range option, this 2.5 A / 24 VDC supply shares the 47-63 Hz input window with its 5 A sibling while sitting at $202.92. It suits PLC panels, HMI peripherals, and small valve manifolds where reliability matters more than maximum amperage.
- Pro: Reasonable price-to-current ratio for a regulated 24 VDC panel supply.
- Pro: Same frequency tolerance as the premium SDN5, so it handles the same mains environments.
- Con: Limited to fixed 24 VDC output with no adjustable range, reducing flexibility for 12 V or 48 V needs.
Skip this if your application occasionally spikes above 2.5 A; you will want headroom from the SDN5 or SDN20.
Sola/Hevi-Duty SDN20-24-100C DC Power Supply
The 20 Amp output makes this the highest-current 24 VDC unit in the group, suited for motor drives, LED arrays, or multi-zone heating controllers. At $299 it undercuts the 5 A SDN5 on a per-amp basis dramatically. The 60 Hz-only input is the main tradeoff.
- Pro: 20 A rated output provides enormous headroom for demanding continuous loads.
- Pro: Lowest cost per amp among all 24 VDC options listed here.
- Con: Restricted to 60 Hz input, so it will not function on 50 Hz mains or frequency-variable sources.
Skip this if your installation operates outside a 60 Hz grid or on backup generators with frequency drift.
Sola/Hevi-Duty SDP1-48-100T DC Power Supply
This 48-56 VDC, 1 Amp unit is built for low-draw telecom, PoE-adjacent, or signal-conditioning circuits. At $149 it is the cheapest product in the roundup, and the 47-63 Hz window gives it installation flexibility that the 60 Hz-only SDN20 lacks.
- Pro: Lowest absolute price in this comparison, making it a logical choice for single-board or sensor-feed applications.
- Pro: Wide 48-56 VDC output range accommodates equipment that expects a float-charge voltage.
- Con: 1 Amp is genuinely minimal; any load above 500 mA will leave almost no thermal margin.
Skip this if your 48 VDC load draws more than 800 mA continuously; the headroom deficit shortens component life.
Sola/Hevi-Duty SDU500 Industrial UPS
Different from the other entries, this is a 500 VA / 300 W uninterruptible power supply on 120 VAC single-phase input. It protects controllers, small servers, or SCADA PCs from momentary outages and sags. The $699 price reflects battery, inverter, and transfer-switch hardware absent from the DC supplies.
- Pro: Provides true ride-through and battery backup, not just voltage conversion.
- Pro: Compact form factor mounts in standard equipment racks without panel redesign.
- Con: Highest price in the list and ongoing battery-replacement cost adds to lifetime ownership.
Skip this if your equipment tolerates brief interruptions; a standard DC supply with the right specs will serve you better at a fraction of the cost.
SOLA HEVI DUTY SDP1-48-100T AC-DC DIN Rail Converter
The DIN-rail variant of the 1 A / 48 VDC unit adds snap-mount convenience for automation panels where space is tight and tool-free installation matters. It delivers 48 W and shares the 47-63 Hz input tolerance. The $207.30 price is higher than the chassis-mount equivalent at $149, reflecting the mechanical redesign.
- Pro: DIN-rail mounting eliminates screws and brackets, cutting panel-build time significantly.
- Pro: Same regulated output as the standard SDP1-48-100T, so performance is comparable.
- Con: Roughly 40 percent more expensive than the chassis-mount version of the same electrical specification.
Skip this if your panel already has screw-mount provisions; you will pay a premium for a mounting style you do not need.
Sola/Hevi-Duty SDP4-24-100RT DC Power Supply
This 4.2 Amp / 24-28 VDC unit is our overall value pick. It sits at $169.99, delivers meaningful current for solenoid banks or small drives, accepts 47-63 Hz input, and adds an adjustable output range that fixed-voltage models lack. Owner reports highlight quiet operation and consistent regulation under load.
- Pro: Adjustable 24-28 VDC output lets you fine-tune voltage for equipment that deviates from nominal 24 V.
- Pro: Best combination of amperage, frequency tolerance, and price in the entire roundup.
- Con: No DIN-rail variant is listed, so mounting requires the standard chassis screws.
Skip this only if you need more than 4.2 A or require DIN-rail mounting specifically; otherwise it is the hardest unit in this group to beat.
Buying Guide
Match Amperage to Sustained Load
Select a supply whose rated continuous current exceeds your worst-case draw by at least 25 percent. Running a 20 A load on a 20 A supply is technically within spec but accelerates electrolytic capacitor aging and raises internal temperature. If your system draws 3 A steady-state, the 4.2 A SDP4-24-100RT is a better fit than the 2.1 A SDP2.
Check Input Frequency Tolerance Against Your Mains
Units rated 47-63 Hz will operate correctly on clean 50 Hz or 60 Hz grids. Models restricted to 60 Hz only, like the SDN20, will fail or derate on 50 Hz power common in many industrial regions outside North America. If your site runs on generators or has variable-frequency drives upstream, the wider 43-67 Hz window of the SDP2 matters.
Decide Between Chassis Mount and DIN Rail
DIN-rail modules like the SDP1-48-100T DIN variant install faster and are easier to hot-swap during maintenance, but they cost more and often offer less thermal mass, which limits continuous current. For fixed panels with adequate internal volume, chassis-mount units deliver more current per dollar.
Our Verdict
Top pick: the SDP4-24-100RT at $169.99 offers the best balance of amperage, adjustable output, and frequency tolerance. Budget pick: the SDP1-48-100T at $149 is the cheapest way to get a regulated 48 VDC feed for light loads. If your requirement is sustained high current above 5 A on a 60 Hz grid, the SDN20-24-100C wins on cost-per-amp despite its narrower input window.
FAQ
Can a Sola power supply replace a standard ATX supply in a PC?
No. These are industrial DC conversion units with single or limited voltage rails and no standby power management. A PC needs multiple regulated outputs (3.3 V, 5 V, 12 V) with sequencing logic that Sola supplies do not provide.
What does the “T” or “P” suffix mean in the model number?
In the Sola naming convention, the letter generally indicates form factor and mounting style. “T” units tend to be open-frame or compact chassis types, while “P” denotes panel-mount enclosures. The “RT” suffix adds rail-mount or adjustable-range options.
How long do Sola power supplies typically last?
Owner reports from industrial maintenance forums suggest 5 to 10 years of continuous service is common when units are operated well below their rated current and kept in ventilated enclosures. Battery-containing products like the SDU500 require periodic cell replacement on a 3 to 5 year cycle.
Do I need a UPS if I already have a regulated DC supply?
A regulated supply converts AC to DC cleanly but does nothing during an AC outage. If your controller or sensor network must ride through blackouts or brownouts, the SDU500 UPS is a separate protection layer, not a substitute for the DC supply itself.
