ESPEC’s solid construction walk-ins are desirable for testing large loads of PV modules or panels at 85°C/85% as well as humidity-freeze and temperature cycling tests.  Hermetically welded seams and stainless-steel interior ensure integrity under extreme conditions required by IEC.

The models come in different performance versions, depending on your application. More powerful performance allows you to complete the temperature-cycling test faster, or with a maximum number of modules. There also is a 'damp-heat' only model that saves you capital-cost and energy.

Easy-to-use Programmer

In addition, the P-300 programmer makes running an ESPEC environmental test chamber a breeze. The full-color, touch-screen interface is remarkably easy to use and understand. The P-300 can be managed remotely via our new Ethernet/LAN-based Web Controller, serial port, or GP-IB/LabView.

Solid Walk-in Overview

This video is an overview of the features and benefits of the Solid Walk-in series.

Features for EWSX282 Solar Panel Large Walk-in Chambers
  • Large interior volume
  • Touch-screen controller
  • Viewing window
  • Optional module rack with rollers

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Solid walk-in chamber designed for testing up to 20 PV modules

Product Suggestions
    Model NumberInterior Dimensions
    (W x D x H)
    Interior VolumeTemperature RangeHumidity ControlChange Rate
    EWSX282-12NWL72" x 72" x 94"282 cu. ft.-70 to 150°CYes up to .73°C/min.
    EWSX282-15NW72" x 72" x 94"282 cu. ft.-70 to 150°CYes up to .73°C/min.
    EWSX282-22NW72" x 72" x 94"282 cu. ft.-70 to 150°CYes up to 1.67°C/min.
    EWSX282-30NW72" x 72" x 94"282 cu. ft.-70 to 150°CYes up to 1.67°C/min.
    EWSL282-2NA72" x 72" x 94"282 cu. ft.15 to 150°CYesUsed for 85°C / 85% Damp Heat Test

          Click model number for details, including metric & english units.

    Get improved performance, energy savings, plus USB access

    New P-300 controller with USB

    The exclusive ESPEC P-300 controller has USB and Ethernet features to make programming and data collection easier than before. The user interface uses tabs for faster access to any screen. Standard USB and optional Web Controller/Ethernet interfaces make programming and data acquisition much simpler. In addition, improved algorithms make operation faster and smoother.

    DEMO: See how easy the P-300 is

    USB port for upload/download of test profiles and test data

    • Test programs can uploaded or downloaded from the P-300 via USB thumb drive.
    • Create, edit, and store programs on a PC using the included Pattern Manager Lite software.
    • Accurate, repeatable testing by uploading the same program to multiple chambers.
    • Create your own back-up archive of programs, and get additional profiles from ESPEC's library.
    • Retrieve and download test operation data via USB thumb drive. Data timeframe is selectable.
    • For integrity, viewing test data on a PC and exporting to Excel requires included Pattern Manager Lite software.

    Energy-saving operation

    Invisible to the end user, the P-300 uses advanced cooling control via an electronic expansion valve, saving energy and improving temperature stability. Sophisticated future-looking algorithms make temperature ramping faster and smoother. These high-end features are unique to ESPEC. Additional improvements in refrigeration and heater operation will make the next generation of ESPEC chambers the most energy efficient ever.

    Additional capabilities

    • Store up to forty programs, as well as three different constant-mode set-ups.
    • Multilingual display in English, Japanese, Chinese, or Korean.
    • Alarm diagnostics and history, plus a ‘back trace’ feature for troubleshooting.
    • Three programmable timers allow the user to set reminders for maintenance or other actions.
    • Energy saving by using only one compressor when testing above -10°C (for cascade refrigeration models).
    • Optional Ethernet/browser-based Web Controller access can also be used to upload and download programs, as well as data.
    • Optional Product Temperature Control allows faster ramping to the desired conditions on the sample.
    • Computer interface options for specialized programs: RS-232/serial or GP-IB.

    P-300 Specification


    Color touch-screen, 6.5 inch diagonal, 640x480 resolution
    Multilingual display in English, Japanese, Chinese, or Korean

    Control Method

    PID (Proportional, Integral, Derivative)
    plus WRTC (Window Reference Trajectory Control)


    Standard: USB External Memory port
    Optional: RS-232, RS-485, GP-IB, Ethernet

    Operating Modes
    (as indicated in upper left of the display)

    STOP: chamber off, programmer on
    PGM: RUN runs selected test profile
    CONSTANT: runs at set value continually

    Program Capacity

    40 programs, 99 steps per program

    Programming Capabilities

    Create or copy programs
    Upload and download of programs via USB
    Copy, edit, insert, and delete steps
    Two nested loops to repeat steps 999 times
    Selectable end-of-test modes
    Create pause steps within programs
    Soak control delays timer until setpoint is reached

    Additional Functions

    Alarm report lists last 1000 alarms and time occurred
    Time signal relay control (with naming capability)
    High/low limit alarm functions
    Audible alarm with on-screen explanation
    Selectable restart modes after power failure
    Automatic start and stop functions
    Keylock protection and configuration lock-out
    Service guide and help screens
    Three settable reminder alarms for PM
    Running time meter is integral
    RoHS directive lead-free compliant

    Pattern Manager Lite Software

    Allows creation, editing, and archive storage of test profiles on a PC
    Test profiles may be uploaded and downloaded to P-300
    Allows viewing and graphing of chamber operation data downloaded via USB
    Operation data may be exported to CSV for use with Excel or other programs

    Software Options

    Learn more about ways to access ESPEC controllers via software our support page:
    Software for P-300

    Recommended: Web Controller

    The ESPEC Web Controller is an embedded server/software solution for monitoring and programming your chamber via Ethernet. Works with P-300, SCP-220, F4T, & F4 controllers.

    See the brochure
    Self-install kit for existing units
    Try the live demo now!

    Independent of the controller itself, the Web Controller adds additional capabilities for datalogging, programming, alarm emails, and RESTful API.

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    Contacting ESPEC

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    +1 616-896-6100 (8-5 EST)
    Find & call your local sales rep

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    +1 616-896-6170 (8-5 EST)
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