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Frequently Asked Questions

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Everything from VoIP phones to thin clients to LCD TVs can be powered with PoE. Just determine how much power your device will need, and chances are there is a PoE product available to integrate into your design.

Below is a chart of some of the PoE wattages offered by ELe and examples of some of the products you can power with them.

What Can I Power with PoE?

13W 30W 60W – now 100W – soon 200W – not far off!
IP Cameras
VoiP Phones
Wireless Access Point
Networked Audio
IP Telephones
WiMAX Access Points
PTZ Cameras
Remote Computer Terminals
Door Access Systems
Video Phones
Thin Clients
Digital Signage Displays
Point-of-Sale Systems
LCD TVs
Computer Monitors
Larger TVs
Larger Displays
Larger Monitors
Laptops

 

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802.3af and 802.3at PoE Standards

The Institute of Electrical and Electronic Engineers (IEEE) is responsible for creating PoE standards.

There are currently two PoE standards available. The 802.3af standard supports 15.44 watts of power. But even though 802.3af Powered Sourcing Equipment (PSE) are able to transmit 15.44 watts of power, powered devices (PDs) can only reliably receive 12.95 watts of power due to power dissipation. In 2009, IEEE introduced the higher powered 802.3at standard, also known as PoE+. The standard supports 30 watts of power, but in similar fashion to the 802.3af standard, power dissipation causes powered devices to receive slightly lower amounts of power, specifically 25.5 watts of power.

802.3BT or PoE++

IEEE is currently overseeing yet another higher powered PoE standard. As the utility of PoE expands beyond the networking sector, higher powered PoE will be able to support nurse call systems, point of sale systems, IP turrets used by financial traders, and higher powered IP cameras such as PTZ Cameras, among many other applications.  802.3bt, also known as PoE++, the new standard is expected to be ratified in early 2017, will utilize all four twisted pairs to transmit power. The 802.3bt standard will be able to achieve 49-70 watts of power using this method. The new standard will essentially combine both Mode A and Mode B to achieve the higher voltage. Some sources even site that the standard will be able to supply up to 100 watts of DC power. This newer standard will not only allow for higher power, but will also be able to support 10 Gbps connections. Type A specifies for 60W (50 watts of power) and Type B specifies for about 100 watts of power (approximately 80 watts of power with power dissipation).

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  • Cost-efficiency– PoE eliminates the cost of hiring professional electrical installers.
  • Quick Deployment– PoE simply requires plugging in networking cabling to the proper equipment in order to function correctly.
  • Flexibility– Network administrators can deploy powered devices at nearly any location. Shielded cabling can be used for outdoor environments. Industrial-grade powered devices can be used for industrial environments.
  • Safety– Because PoE utilizes a relatively low voltage, it presents low risks of electrical hazards.
  • Reliability– PoE falls under IEEE’s strict 802.3 standard umbrage.
  • Scalability PoE makes it simple to add new equipment to a network.

The most common types of PoE utilisation include:

  • VoIP phones
  • IP cameras
  • Wireless Access Points

However, PoE can also power other devices including:

  • PoE lighting
  • ATM machines
  • IP Intercoms
  • Security Card Readers
  • IP Clocks
  • Vending Machines

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PoE or Power over Ethernet as it is also called enables electrical power to be passed through Ethernet cables instead of standard electrical wiring. Since one does not need a licensed electrician to run Cat5e or Cat6 cable, and this networking cable can be run anywhere, there is much greater design flexibility. Products like digital signage and security systems become simplified and less expensive to install.

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No, not at all. In fact many of our customers do not have any renewables and just charge their battery banks when the grid is available or overnight from cheap-rate energy tarifs- this is called “load shifting” or “load shedding”.

The electricity source could also be from a fuel cell product or a generator (petrol or diesel)!

load shedding

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University of Manchester conducted a 5 month test project and has independently verified the quality and longevity of the ELe battery packs.

university of manchester

Key Conclusions

 Assuming a linear capacity loss with cycle number then a worst case scenario is for a ‘day’ cycle consisting of a 10A 10 hour charge profile and overall computer loading of 750W for 7 hour, then the ELE-POD is predicted to be able to perform 2830 cycles before 80% capacity remaining is reached.

2830 cycles is equivalent to daily usage for almost 8 years. Or, assuming a UK school year is 195 days, the ELE-POD will reach 80% remaining capacity after 14 years and 6 months.

 Accelerated capacity loss tests with a scaled ‘day’ cycle showed a marginal reduction in capacity loss per cycle if the cells are scheduled to start charging straight after the one hour balancing rest period at the end of discharging as opposed to delaying the charge to finish just in time for the balancing rest before the next discharge cycle.

ELe POD Battery lifetime testing UoM

Extrapolating to 70% EOL is with more risk as the assumed linearity may take the actual value further
from that predicted. Consideration might also be given to changing the BMS parameters to
accommodate ageing cells. Certainly monitoring individual cells and replacing them as necessary may
be a more cost effective way of prolonging battery health.

If 70% of the original capacity is considered EOL then 4244 cycles can be performed by the ELE-POD
of the ‘day’ schedule. This is equivalent to 11 years of continuous use, or 21 years and 9 months for a
UK classroom environment.

Category: Battery Pack

ELe solar solutions are wired in parallel to deliver voltage under 75V DC and are much safer to work on. There is also an isolation switch in order to work on the panels.

If a solar panel fails alerts are sent to the admin team about the failure and are able to charge the batterypack via the AC grid until solar is fixed

Category: Solar Panels

Alerts sent to admin team about failure and able to charge the batterypack via the AC grid until solar is fixed

Users are able to plug the ethernet cable into an alternate injector port

use of PoE extenders to span distances over 100m is possible

100m or 328ft is the 802.3 industry standard for cable lengths

As per CAT5e and CAT6 installation standards there will be a supported degree of separation between AC and DC cables

We use an ACTIVE PoE design adherring to all 802.3 standards and has been used for the last 15 years to power cameras, phones and other electronic devices.

As all ELe CAT5e and CAT6 products are 802.3 industry standards compliant all of the data and power transfer adhere to defined protocols to avoid these issues happening.

Wifi has developed and been widely implemented over the last few years but ethernet cables are still used in places where higher data transfer speeds and data quality is required. There is a place for both technologies in the infrastructure but now ethernet is being used for power will mean more structured cabling will be installed in the future.

As all ELe CAT5e and CAT6 products are 802.3 industry standards compliant all of the data and power transfer adhere to defined protocols to avoid these issues happening.

The system initiates a hand-shake protocol as per 802.3 networking standards and will recognise different classes of powered devices. NO power will be transmitted if no signal is received

All ELe PoE solutions are designed to adhere to industry networking 802.3 standards. This ensures backward compatability for non-ELe PoE devices and also future compatability to

The ethernet system ELe has developed is an ACTIVE PoE, this means that the cables are not live when there is no PoE powered load plugged in and in the event of a break in the cable will switch off the power being sent immediately

The ethernet system ELe has developed is an ACTIVE PoE, this means that the cables are not live when there is no PoE powered load plugged in and in the event of a break in the cable will switch off the power being sent immediately

ELe products are simple plug & play installation devices so level of skills required is reduced

ELe products are simple plug & play installation devices so level of skills required is reduced

ELe products are simple plug & play installation devices so level of skills required is reduced

Educate and train users about how devices are powered over ethernet

The IEC connector on the Controlbox is backup up by inline filters and surge suppressors to remove any hazard to our equipment.

The units can be rack mounted locked cabinets and fully earthed to a suitable earthing point in compliance with current regulations including building regulations part P and BS7671:2008 17th edition

No personal or individual inforation is stored or sent, each packet of data will be a string with a remote Device ID and usage data from various sensors, meaningless to anyone outside of ELe. All data is stored in an ELe designed,built and secure managed database in a UK datacentre.

No personal or individual inforation is stored or sent, each packet of data will be a string with a remote Device ID and usage data from various sensors, meaningless to anyone outside of ELe. All data is stored in an ELe designed,built and secure managed database in a UK datacentre.

Remote monitoring system will see the system has not sent any data across and send alerts to the relevant teams to investigate

System will continue to operate but utilising the AC grid as a backup. Alerts will be sent about failure.

Alerts sent about failure and patch lead(s) can be moved to an alternate injector

Alerts sent about failure and patch lead can be moved to an alternate injector port

AC backup circuit for systems installed where there is an optional grid feed. This ensures the system stays up in the event of a batterypack failure or during any required maintenance is performed. Automatic alerts sent to admin team notifying.

AC backup circuit for systems installed where there is an optional grid feed. This ensures the system stays up in the event of a batterypack failure or during any required maintenance is performed. Automatic alerts sent to admin team notifying.

The battery pack will only supplu a steady voltage via the management system and the PoE injectors in the controlbox further ensure the devices receive DC power is the cleanest and consistent manner possible

Full lightning surge protection built into ethernet injector boards within the controlbox

Full lightning surge protection and AC filters built into the controlbox at the IEC connection

The charging and AC supply is fully monitored and an alert raised if there are any issues giving the support team time to rectify the grid feed before any outages are experienced

Integrated inline fuse and suppression control at the IEC connector in the control box

Lithium-ion is a low maintenance system, an advantage that most other chemistries cannot claim. There is no memory and the battery does not require scheduled cycling to prolong its life.

Category: Battery Pack

Lithium-ion does not have the sulfation problem of lead acid that occurs when the battery is stored without periodic topping charge. Lithium-ion has a low self-discharge and is environmentally friendly. Disposal causes minimal harm.

Category: Battery Pack

ELe Energy storage and distribution

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