This is the FAQ page for the MS Windows version of the Okapi Viewer App

Do you have more questions? 
Please Contact Us and we will do our best to help you out!

Also, feel free to join the discussion forum on Sourceforge.com
(where this Okapi Viewer App is available for download).



Recent Okapi Viewer App (for MS Windows) FAQ

  • What is my "Max CFM" I'm supposed to enter into the box near the bottom? The Max CFM you are supposed to enter is the actual CFM of your fan when at max fanspeed, while operating your solar collector. (It is not the max CFM ...
    Posted Dec 11, 2014, 6:22 AM by Greenhill EnviroTechnologies Inc.
  • Troubleshooting: Connecting with Okapi (once you have Added it as a Device) You were able to Add Okapi as a Device, but are having trouble Connecting using the Okapi Viewer App?Just click connect, again. It can sometimes just take a second ...
    Posted Dec 11, 2014, 6:07 AM by Greenhill EnviroTechnologies Inc.
  • Troubleshooting: Detecting Okapi and Adding it as Device on your Computer  Troubleshooting Adding your Okapi as a "Device":Make sure you have connected your Okapi to a functioning power source. There is no "on" switch, Okapi is automatically on as soon ...
    Posted Dec 11, 2014, 6:03 AM by Greenhill EnviroTechnologies Inc.
  • How do I "connect" with my Okapi? Here are the basic steps of how to connect your computer with your Okapi:Open your control panel and go to "Add devices"As it searches for new devices, (your ...
    Posted Dec 11, 2014, 6:04 AM by Greenhill EnviroTechnologies Inc.
Showing posts 1 - 4 of 4. View more »

What is my "Max CFM" I'm supposed to enter into the box near the bottom?

posted Dec 11, 2014, 6:22 AM by Greenhill EnviroTechnologies Inc.   [ updated Dec 11, 2014, 6:22 AM ]

The Max CFM you are supposed to enter is the actual CFM of your fan when at max fanspeed, while operating your solar collector. (It is not the max CFM rating of the fan on the fan data-sheet.)

The standard fans we use and deliver with our Okapi Systems have a data-sheet rating of 110 cfm: this is when the fan has zero airflow impedance.

When a fan is pulling air through any solar collector, there will always be some level of airflow impedance, making the max CFM when the fanspeed is at 100% a little less than 110cfm, for instance. As each collector design is different giving different levels of impedance, this 100% fanspeed CFM must be measured.


To get this measurement, you will need an anemometer (-They are easy to find and quite inexpensive... also fun to play with!)

  • On a full-sun day, when your collectors are running full blast and Okapi Viewer tells you your fanspeeds are at 100%, take a few anemometer readings at your outlet(s). 
  • Then, Download the Solar Heater Output Calculator app (-the file is located at the bottom of the page link below). As you have already updated your Java to get the Okapi Viewer App, you will not need to update your Java, again. Simply download this calculator program:



 Once you have downloaded the Solar Heater Output Calculator App, use "open with" your "Java(TM) Platform SE binary".

1. Ignore the other input boxes, for now...
2. Type in the FPM measurement you make using your anemometer, when fanspeeds are at 100%, into the FPM box for both heaters (they may give different readings being of different design, if you have two heaters... and you may get a few different readings depending on how and where you hold the anemometer... getting a nice estimated average is good enough!
3. then type in the diameter of your outlet vent, or if it is square, you can type in those dimensions...
4. and finally, look down at the CFM results box, and that is your calculated "max CFM" for your fan for your solar collector, right there for you!

(Oh, and have some fun playing around with all the other features of this calculator app, too!)

Troubleshooting: Connecting with Okapi (once you have Added it as a Device)

posted Dec 11, 2014, 6:07 AM by Greenhill EnviroTechnologies Inc.   [ updated Dec 11, 2014, 6:07 AM ]

You were able to Add Okapi as a Device, but are having trouble Connecting using the Okapi Viewer App?

  1. Just click connect, again. It can sometimes just take a second or third try. (-Computer was busy during previous attempts.)
  2. Close the Okapi Viewer App, "Remove Device" (the ABBTM) from the control panel. Also, disconnect and reconnect the Okapi from its power source (basically like restarting the Okapi). Then re-add Okapi as a device again. Open the Okapi Viewer App again, type in the com port # into the box in the App, (yes, look again, it may be with a different comp port number when you remove and add a device, again), and click connect.
  3. Do the previous step, but also restart your computer.

Troubleshooting: Detecting Okapi and Adding it as Device on your Computer

posted Dec 11, 2014, 6:02 AM by Greenhill EnviroTechnologies Inc.   [ updated Dec 11, 2014, 6:03 AM ]

 Troubleshooting Adding your Okapi as a "Device":

  1. Make sure you have connected your Okapi to a functioning power source. There is no "on" switch, Okapi is automatically on as soon as it is "plugged in".
  2. Check to make sure your computer really has Bluetooth. If not, you may need to go purchase a USB Bluetooth accessory.
  3. Some computers are awesome at detecting bluetooth devices like Okapi: they can be up to 30ft away, with walls and floors between them and still have no problems detecting. Some are not so great at detecting devices. In this case, try moving your computer within line-of-sight and closer to the Okapi.
  4. Try restarting your computer, and also doing the same with the Okapi (unplugging it and then plugging it back in again to its power source.)

How do I "connect" with my Okapi?

posted Dec 11, 2014, 5:57 AM by Greenhill EnviroTechnologies Inc.   [ updated Dec 11, 2014, 6:04 AM ]

Here are the basic steps of how to connect your computer with your Okapi:

  1. Open your control panel and go to "Add devices"
  2. As it searches for new devices, (your computer must be Bluetooth enabled), you should see a device called "ABBTM" appear.
  3. Click next
  4. Enter code (-it is always this code: four zeros): 0000
  5. Then, click next, again.
  6. This device should now be added to your computer.
  7. Right-click to see "properties" of this "ABBTM" device. Under the "Hardware" tab, you will be able to see which "com port" number it is using: it may display "com3", for example. Remember the "com port number".
  8. Go back to the Okapi Viewer App and type in the com port number into that box.
  9. Click Connect!

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