Is it possible?

[TheNet]

Hello,

Is it possible to reach the switch GUI if power is dropped to 9v or between 9v-9,5v?When i tested the power led is only glowing thing on switch when power is about 9v.
I'm using ws-150-dc with low discharge rate 12v90AH gel battery . When the switch will be accessible through tcp/ip GUi or ssh?When it starts? What voltage point? because it is showing acceptable power range is from 9-72v.
Is it possible to override the 9v cut off and do the work with completle discharge battery to 2v or something volts?
Way the negative connector is not galvanicaly isolated from the box ground?

[sirhc]

Is it possible to reach the switch GUI if power is dropped to 9v or between 9v-9,5v?When i tested the power led is only glowing thing on switch when power is about 9v.
I'm using ws-150-dc with low discharge rate 12v90AH gel battery . When the switch will be accessible through tcp/ip GUi or ssh?When it starts? What voltage point? because it is showing acceptable power range is from 9-72v.

If below 9V the switch (WS-8-150-DC) is mostly shut down to conserve power (around 3-4 watts) so no you can not reach it.

The WS-12-250-DC goes one step further and fully shuts the switch down and uses way less than 1 watt to monitor the batteries and wake back up when the desired voltage is reached.

Is it possible to override the 9v cut off and do the work with complete discharge battery to 2v or something volts?

You can increase the voltage above 9V when it shuts mostly down but no you can not lower the voltage.

Do you have any idea what your asking for, you want us to up step 2V to 50V @ 150 watts?

Do you have any idea how many AMPS that would be at 2V, I am guessing not?

How about use (2) 12V batteries in series and start with 24V then you can discharge each battery to 4.5V

Or start with (4) 12V batteries in series and start with 48V then you can discharge each battery to 2.25V
But asking us to accept 2V and push 50V is ridiculous.

Way the negative connector is not galvanicaly isolated from the box ground?

As of 9/7/2016 all switches being produced have the DC negative bonded to chassis ground.

The reason we are doing this is because most inexpensive radios such as UBNT Rockets and most others have their DC negative bonded to Earth Ground giving the radio access to tower Earth Ground through the antenna connection to the tower steel and too many people were not properly bonding their service/cabinet grounds to tower grounds and not running dedicated ground wires thus causing ground current from 2 different ground potentials going across the Ethernet cables and through the switch which caused damage to the switch.

So as of 9/7/2016 we gave up and also bonded our DC negative to Earth Ground just like UBNT does in their switches.

This will lower our damage rate from people with poor grounding practices. In theory our switches can now pass up to 40 amps of ground current depending on model and how many cables are being used.

My guess is far fewer of our switches will be damaged but now more radios may be damaged from poor grounding practices?

Here are some good posts on grounding:
viewtopic.php?f=30&t=1816
viewtopic.php?f=30&t=188
viewtopic.php?f=30&t=1429
viewtopic.php?f=17&t=1786&start=30#p13447
https://community.ubnt.com/t5/airFiber/ ... rue#M31070