Okapi Solar Calculator App
The Okapi Solar Calculator app is a powerful tool that:
Additionally, if you own a wireless Okapi system, the app can be used to:
Localized versions include: Nederlands, Français, Deutsch, Svenska, Español, Italiano, čeština
Enhanced sunlight strength estimation: Additional controls implemented to both calibrate and fine tune the light meter readings.
Light filter set
Click or tap here to purchase low-cost Rosco Neutral Density filters for the light meter on your phone or tablet (set of three including ND.15, ND.3, ND.6).
The following video shows the basic steps on how to perform this procedure
Please send feedback, questions or requests for new features or updates to firstname.lastname@example.org.
Okapi Solar Calculator feature list:
Okapi real time data monitoring (Okapi system required)
Connects Android device via Bluetooth to Okapi Solar Air heater control systems
Displays output for each connected heater: Inlet and Outlet temperatures in °C or °F, Temperature rise between inlet and outlet, fan speeds and thermal power output (kWh or BTUh)
While connected to Okapi system, the app records all received data
You can share Okapi real time data to email or social media such as Facebook
Solar and HVAC calculator (Okapi system not required)
Enter measured temperatures from Inlet and Outlet (°F or °C)
Enter measured wind speed from the outlet (FPM or m/s)
Enter dimensions of the outlet (inches or cm), can be round or rectangular
Choose if equivalent diameter calculation (Huebscher) is required when a rectangular outlet is selected
Enter elevation or have the App calculate it automatically using GPS and an internet connection
App then automatically calculates:
All unit conversions are also available, simply push a button to convert temperatures from °F to °C, another button to convert cm to inches (including squares and cubes where required), and another button to convert between watts and BTU.
This data can also be shared to social media, email etc.
Data logging (Okapi system required)
The app can be left running on an Android device connected to an Okapi system to log data over long periods
Features here include full SQL lite database that stores accurate hourly heating calculations
User ability to enter reports, including start and end date as well as identify which Okapi system (if data has been received from more than one Okapi system)
Ability to easily share reports from the app, for bragging rights, graphing or further analysis
Sun position activity (Okapi system not required)
All above output data can easily be shared via email, social media etc.
Sharing has two detail options. Basic is an hourly report that details sun position (azimuth and elevation) from sunrise to sunset. The "Detailed" option reports the position of the sun for every five minutes between sunrise and sunset.
There's also a "Today" button to reset back to "now", once you're finished analysing other dates. You can also get the timezone offset manually (internet connection required).
Sun strength activity (Okapi system not required, however, if one is connected then efficiency data is available)
Uses light sensor on Android device to measure solar irradiance in watts per square meter or BTUh/ft² (and use this data to estimate insolation)
Some android devices have weak light sensors, therefore a clever system has been implemented to enable the weaker light meters to provide reasonable sun strength measurements
Functions are implemented to guide the user through the process of setting up the light meter for best measuring the sunlight strength
Toggle button to convert between watts/sq.m and BTUh/ft²
Share button available to send your data via email, social media, Bluetooth, Google cloud print, Android Beam, Google+, Hangouts, Facebook, etc
Settings (for entry of detailed data regarding connected Okapi systems)
For each heater (up to two heaters attached to your Okapi system):
Outlet area is then calculated for you, as is the Maximum airflow (in CFM or m³/min)
There's a button to toggle between metric and imperial units (all conversions are done for you)
You can also disconnect the Okapi here, if you need to save battery power on the Android device
Connect and Disconnect Okapi systems is also available from the main menu, as is a link to the App's help section on our website
Sensors, hardware and features used by the Okapi Solar app:
GPS for location discovery
GPS + Internet for accurate Elevation detection
Bluetooth for connection to Okapi systems
Light Sensor used to evaluate the strength of sunlight
Ambient temperature sensor, used to display the temperature around the Android device
Magnetometer used for compass, heading and pitch detection
Accelerometer used for compass, heading and pitch detection
SQL Lite databases, used for storage and reporting of logged Okapi data
Preferences, all user settings are recorded on a per device basis, allowing easy use of multiple Okapi systems
Sun location activity uses GPS (and/or a built-in Google map) to set the location and is able to report on past, present and future sun positions during any day, anywhere in the world, with very reasonable accuracy