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voxframe

join:2010-08-02
reply to John Galt

Re: OT - Site Monitoring Device - Input Needed

I think it's a great idea, provided it fixes the problem that I commonly see with other manufacturers and that is *FULL* support for things like SNMP, or other "open" protocols.

I can/do homebrew most of this stuff for a lower cost, and the honest reason why I don't bother with any pre-built solutions is they all lack simple options like this. You either are stuck using some 3rd party software for monitoring and control, or it speaks some obscure broken version of SNMP, just to fuck you up from using other vendors etc.

I can see a lot of these issues being addressed by Ubnt's Mfi, but from what I'm gathering more and more, the units don't support a lot of basic things that people want, or they are tied into some specific software.

What I loath the most with these devices is the lack of all around sensor inputs. Oh you want temperatures, that's an upgrade, this one only gives contacts... Oh you want voltage with that too? Go up to a higher model.

The "base" version should have at least ONE of everything, then the higher level ones should be multiple ones etc for a larger site deployment.

The absolute base should be
-TEMP
-VOLTS
-2 Contacts
-2 Relays

(Which is what I think you have here)

Also they should include the sensor for each contact.
Let's be honest to build a temperature sensor is peanuts, but I see asshole companies selling them for 40-99$ each.
Put the sensors with the package so there's no "option" crap (At least with base model) and it makes it worth considering.

Also, sensors should obviously speak "English" and not output some other obscure signal that nothing else understands, or works with. Again I can't believe how many vendors "dick" with their sensors just to make them incompatible with anything standard.


John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:8
said by voxframe:

Also, sensors should obviously speak "English" and not output some other obscure signal that nothing else understands, or works with. Again I can't believe how many vendors "dick" with their sensors just to make them incompatible with anything standard.

The I/O will accept industry-standard 4-20mA and 0-10V.

Chele

join:2003-07-23
kudos:1
said by John Galt:

said by voxframe:

The I/O will accept industry-standard 4-20mA and 0-10V.

Make it able to handle up to 36v so that it can be connected directly to solar power systems. We have had to use voltage regulators only because UBNT won't work on anything above 24-25v, my gripe with that is not the cost of the voltage regulator but it's just one more piece that can fail. Let the units have dual input sensors--one to measure the solar feed and another to measure battery condition. I know it's going above and beyond your initial intentions, buuuuuut-----------make a unit with remote rebooting/ping watchdog capabilities. It goes without saying, make it rugged! It's amazing the working conditions we subject the equipment to and ask(demand!!) that they work reliably. As always, pricing is an issue--most WISPs will have several POPs and it begins to add up.


John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:8
said by Chele:

Make it able to handle up to 36v so that it can be connected directly to solar power systems.

Units will accept up to 48V at either the power connector or POE.

Let the units have dual input sensors--one to measure the solar feed and another to measure battery condition.

Gots!

I know it's going above and beyond your initial intentions, buuuuuut-----------make a unit with remote rebooting/ping watchdog capabilities.

Done.

It goes without saying, make it rugged! It's amazing the working conditions we subject the equipment to and ask(demand!!) that they work reliably.

Various cases are an option for demanding conditions (IP65 and such).

As always, pricing is an issue--most WISPs will have several POPs and it begins to add up.

But of course! That is the whole objective here...to reduce the cost of such technologies significantly.
--
The most powerful weapon in the world is ignorance. Politicians exploit it to achieve almost anything they want.


Chele

join:2003-07-23
kudos:1
Well, never mind, if you're going to be difficult about it Put me down on your list, it sounds promising!

bburley

join:2010-04-30
Cold Lake, AB
reply to John Galt
said by John Galt:

said by Chele:

Make it able to handle up to 36v so that it can be connected directly to solar power systems.

Units will accept up to 48V at either the power connector or POE.

48V is not enough for 48V Solar systems. Our 48V battery bank can reach 64V during peak charging. I blew up two $700 boards that were rated at 70V due to the "stiff" supply voltage at the instant of turn-on. Finally had to install a 24V DC-DC Converter and run from that. Funny that the converter was also rated at 70V input but it survives. It was cheaper than blowing up another board.


John Galt
Forward, March
Premium
join:2004-09-30
Happy Camp
kudos:8
said by bburley:

said by John Galt:

said by Chele:

Make it able to handle up to 36v so that it can be connected directly to solar power systems.

Units will accept up to 48V at either the power connector or POE.

48V is not enough for 48V Solar systems. Our 48V battery bank can reach 64V during peak charging. I blew up two $700 boards that were rated at 70V due to the "stiff" supply voltage at the instant of turn-on. Finally had to install a 24V DC-DC Converter and run from that. Funny that the converter was also rated at 70V input but it survives. It was cheaper than blowing up another board.

Talking with the interface engineer...he says that it can accept line voltage, properly protected (fused and current-limited).

Our objective is to limit the on-board working voltages to 50 volts or less, as this is the breakpoint for Class 2 devices. The requirements are far less stringent in many applications.

A voltage divider prior to the input is easy to do...more than happy to sell you one for $99.
--
The most powerful weapon in the world is ignorance. Politicians exploit it to achieve almost anything they want.


bburley

join:2010-04-30
Cold Lake, AB
A voltage divider is usually just two resistors which is only suited for steady current loads, unless you meant something else.

The DC-DC Converter worked out well. Everything but the touchy board was running on 48V. Having 24V available allowed me to add a MikroTik Router later on.

The touchy board had an on-board regulator which allowed it to work with an input voltage as low as 15V or so. It was the regulator that kept exploding at turn-on.