Simply put, the Web Energy Logger (or WEL) is the most economical way to monitor lots of temperature sensors, plus a host of other energy related devices in your home or office. It's ideal to verify the performance of a solar thermal system, or to calculate the efficiency of a geothermal installation, or even to prove that your home really is Net Zero. (User Guide.)
Not only does the WEL give you a window into your energy environment, but it also provides a live snapshot of your system, and a range of trend charts that you can share on the WEB in real-time.
Finally, the WEL records all your sensor data in monthly log files that are easy to download and import into programs like Excel. It's compact, versatile, and extremely configurable.
The minimal WEL in a Box (above) is ideal for a DIY'er, and costs $395.
In contrast, the more complete WEL Starter Kit (right) is ready to run out-of-the-box with 10 temperature sensors and costs $535. All WEL's come with full monitoring software on the board, and a dedicated WEL logging site included in the price. For the full range of components and prices visit our online store.
Visit our Map page to see where the WEL is being used, and watch some live data
A little history:
The WEL is the fourth generation of the HVAC monitoring system that I originally designed for my Energy Efficient home in the mountains of western Maryland, and it's optimized for people who want to build their own monitoring system.
When I designed the energy systems for my home, I needed to ensure that they were performing as anticipated. Since I had incorporated Passive Solar design, Geothermal heating and cooling, Energy Recovery Ventilation and a Radiant Hydronic slab there was a lot to monitor and record. So I needed a system with lots of sensors at reasonable cost. I've designed and built a bunch of remote sensor systems in my robotics career, so I knew that the cost of lots sensors and input channels was going to be a big problem. When I came across the Dallas (now Maxim) 1-Wire sensor bus, I knew I'd found the ideal technology. These digitally addressable sensors all share one pair of wires, so they gave me the ultimate in flexibility and economy. I just strung a single twisted-pair throughout the house, and snapped on sensors wherever I needed them.
The first generation WEL was a clunky dedicated PC. The second generation was an embedded processor on a prototyping board. The third generation was an embedded processor on a custom designed interface board. The latest design (WEL 4.0) adds more pulse counter channels and brand new analog inputs. The Web Energy Logger is as low-cost, versatile, and easy-to-set-up as I can make it.Here are the basic steps for installing and running a WEL.
Now start watching you system. Add new trend graphs as you need them, and share your data with the community. It's amazing what you can lean about your system that you never anticipated.