Any wireless engineer who has spent time completing AP-on-a-stick (APoS) surveys has probably used the Terrawave MIMO 802.3af POE battery. It was a heavy lead-acid battery in a metal case, which promised six hours of use before needing a recharge. Most days it did deliver 6 hours when powering an AP with a single radio enabled. However, I often found that if you ran both AP radios, it would regularly give you less; usually running right around 5 hours with a charge during a meal break.
Did I mention it was heavy? Travel through airports and the TSA was a lot of fun too!
Now, Ventev has a new battery, the VenVolt. It’s sleek, orange, and much lighter. The VenVolt has a bunch of new features which make this an essential addition to any wireless engineer’s toolkit.
- The battery is now a lithium iron phosphate. That’s the weight savings that makes this thing easy to take on the road. It also ensures plenty of power delivery when needed and long-term stability of that power. Additionally, LiFePO4 battery chemistry is known for higher cycle life and better stability, which should relieve any concerns of a Samsung Note 7 style battery fires.
- Better power delivery allows the VenVolt to efficiently deliver 802.3at power; a requirement for 802.11ac access points.
- If 802.3at power wasn’t enough, Ventev includes a three amp, 15 watt, USB power port. That port can be used to trickle charge a laptop, or it can power my favorite tool, an Odroid, which I always use when surveying.
- That power port wouldn’t be nearly as exciting for me without the final major upgrade, ethernet passthrough.
There are lots of “little” updates that should be mentioned as well:
- A single switch! No more guessing which switch combination was needed for charging.
- An LCD screen that shows charge status, voltage, and gives you some guess of the available runtime.
- The case is ruggedized and has been drop tested to ensure reliability.
Let’s talk through my “new normal” setup with the VenVolt. I connect the AP to the “802.3AF/AT Out” port. There is no difference between that and the old heavy battery.
Next, I connect an ethernet cable between the “Ethernet In” port on the VenVolt and the ethernet port on my Odroid.
Finally, I connect a micro-USB cable between the Odroid and the USB port on the front of the VenVolt.
The magic happens due to the flexibility of my Odroid. A few jobs it runs:
- iPerf, HTTP, Ping endpoint for any throughput/active surveys that I need to run.
- TFTP Server – This is where I host boot or firmware files for the many various AP’s that I might use for surveys.
- DHCP/DNS Server – Makes it easy for the TFTP Updates, client connections, etc.
- Encrypted File Storage – This is where I store backups of survey files, any building drawings that I am given, or any specifics that I might need at a location.
One final note. The VenVolt is labeled “MK1”. To me, this is a suggestion that updates will come in the future, rather than the “one-and-done” approach of the Terrawave Battery. While I’m excited to see what may come in MK2, this is an excellent upgrade and a definite requirement for anyone who spends time doing APoS surveys.
There was an excellent session at WLPC, where Ventev employees Dennis Burrell and Mike Parry, along with Sam Clements discussed the development process for the VenVolt. It’s worth watching:
Ventev Infrastructure supplied me with a VenVolt for testing and provided me the ability to give feedback. All written content provided here is my personal opinion, and has not been manipulated in any way by Ventev. I appreciate all companies who welcome constructive feedback!