Difference between revisions of "Autonomous wifi bridge"

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(Created page with "== Usefull documenation == == Power needs estimation == * 2 Ubiquiti Nano LocoM5 24v, 5,5W each, so approx 12W * 1 Ubiquiti ToughSwitch 5PoE 24v, 2,5W, so approx 3W * TOTAL...")
 
 
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== Usefull documenation ==
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== Schema/distances ==
 +
 
 +
<pre>---------------                                                    ---------------
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|            |-||                          ||-| |-||          ||-|            |
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|            |                                | |                |            |
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| Location1  |                                | |                | Location 2  |
 +
|            |                                | |                |            |
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_______________                                ___                _______________
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                <-----------815m-------------->      <-----763m---></pre>
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 +
Note: no osbtacles
 +
 
 +
|| WiFi antenna
  
 
== Power needs estimation ==
 
== Power needs estimation ==
  
−
* 2 Ubiquiti Nano LocoM5 24v, 5,5W each, so approx 12W
+
* 2 Ubiquiti Nanostation LocoM 5 24v, 5,5W each, so approx 12W
−
* 1 Ubiquiti ToughSwitch 5PoE 24v, 2,5W, so approx 3W
+
* 1 Ubiquiti ToughSwitch 5PoE 24v, 1,5W
−
* TOTAL => 15w under 24v
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* TOTAL => So to have some margin, 15W
  
 
The estimation is voluntary "high".
 
The estimation is voluntary "high".
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If we assume that the setup is used 24 hours a day at 100% of its capacity, it means 15*24='''360Wh'''
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If we assume that the setup is used 24 hours a day at 100% of its capacity, it means 15*24='''360Wh''' per dey.
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per day. We're not rich, so we assume that we will get '''lead-acid''' batteries.  
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The solar panel have to produce at least 360Wh per day.
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Because of the low yield of lead-acid batteries (10%), the capacity of the battery must be '''at least 150Ah'''. Finally, the solar panel have to produce at least 360Wh per day (this value depends of its size,yield, and the sun exposition).
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The maximum debited current from the batteries to the WiFi installation is 15/24 = '''0.625'''.
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The maximum debited current from the batteries is 24/15 = '''1.1A'''.
+
 
 +
== Solar panel ==
 +
 
 +
At the Goutailloux, the solar power is 1,46kWh/m**2/d, so we can take large : 1,40.
 +
If we take a 300Wc solar panel, the average power delivered a day is 300*1,4=420Wh per day, for the worst case (the december month).
 +
https://www.myshop-solaire.com/panneau-solaire-300w-mono-solarworld-_r_676_i_1560.html : 305€
  
 
== Regulator ==
 
== Regulator ==
Line 17: Line 34:
 
The setup has to be robust, with low temperature and humidity. So we have to take great hardware.
 
The setup has to be robust, with low temperature and humidity. So we have to take great hardware.
 
The MPPT 100/15 seems to be great, it can take 400w under 24v solar panels.
 
The MPPT 100/15 seems to be great, it can take 400w under 24v solar panels.
 +
https://www.myshop-solaire.com/regulateur-solaire-victron-energy-mppt-75-15a-_r_370_i_10.html : 91.80€
 +
 +
== Battery setup ==
 +
 +
=== Lead/acid===
 +
We want to have native 24v because we don't need DC/DC converter for the PoE. We can take 4 batteries of 80Ah each.
 +
We can assemble 2 batteries in series to make a pack of 24v/80Ah, then do the same with the 2 others. Finally, we can assemble this 2 packs (connected in series) in parallel to obtain 24v/160Ah.
 +
 +
=== AGM ===
 +
 +
The adopted choice is to have 2 AGM batteries of 25Ah in series. We will have to use this battery at 60%, so approximately 700 cycles, which is sufficient.
 +
 +
https://www.myshop-solaire.com/batterie-agm-12v-25ah-super-cycle-victron-energy-_r_572_i_1994.html
 +
 +
These batteries are not so expansive and seems to fit our needs.
 +
 +
== WiFi relay prices ==
 +
 +
WiFi antennas will be loan.
 +
 +
== Docs ==
  
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Docs :
 
 
* https://www.myshop-solaire.com/quel-regulateur-solaire-choisir-pwm-ou-mppt--_r_80_a_183.html
 
* https://www.myshop-solaire.com/quel-regulateur-solaire-choisir-pwm-ou-mppt--_r_80_a_183.html
 +
* https://ragedecamp.eu.org/
 +
* https://www.ffdn.org/wiki/doku.php?id=formations:wifi
 +
* https://www.ffdn.org/wiki/doku.php?id=memo_wifi_ubiquiti
 +
* https://www.ffdn.org/wiki/doku.php?id=documentation:wifi_federes
 +
 +
== What do we need ==
 +
 +
We can buy some stuff, but we would like to recover as mush as possible from motivated people :)

Latest revision as of 16:26, 29 July 2018

Schema/distances

---------------                                                     ---------------
|             |-||                           ||-| |-||           ||-|             |
|             |                                 | |                 |             |
| Location1   |                                 | |                 | Location 2  |
|             |                                 | |                 |             |
_______________                                 ___                 _______________
                <-----------815m-------------->      <-----763m--->

Note: no osbtacles

|| WiFi antenna

Power needs estimation

  • 2 Ubiquiti Nanostation LocoM 5 24v, 5,5W each, so approx 12W
  • 1 Ubiquiti ToughSwitch 5PoE 24v, 1,5W
  • TOTAL => So to have some margin, 15W

The estimation is voluntary "high". If we assume that the setup is used 24 hours a day at 100% of its capacity, it means 15*24=360Wh per dey. The solar panel have to produce at least 360Wh per day. The maximum debited current from the batteries to the WiFi installation is 15/24 = 0.625.

Solar panel

At the Goutailloux, the solar power is 1,46kWh/m**2/d, so we can take large : 1,40. If we take a 300Wc solar panel, the average power delivered a day is 300*1,4=420Wh per day, for the worst case (the december month). https://www.myshop-solaire.com/panneau-solaire-300w-mono-solarworld-_r_676_i_1560.html : 305€

Regulator

The setup has to be robust, with low temperature and humidity. So we have to take great hardware. The MPPT 100/15 seems to be great, it can take 400w under 24v solar panels. https://www.myshop-solaire.com/regulateur-solaire-victron-energy-mppt-75-15a-_r_370_i_10.html : 91.80€

Battery setup

Lead/acid

We want to have native 24v because we don't need DC/DC converter for the PoE. We can take 4 batteries of 80Ah each. We can assemble 2 batteries in series to make a pack of 24v/80Ah, then do the same with the 2 others. Finally, we can assemble this 2 packs (connected in series) in parallel to obtain 24v/160Ah.

AGM

The adopted choice is to have 2 AGM batteries of 25Ah in series. We will have to use this battery at 60%, so approximately 700 cycles, which is sufficient.

https://www.myshop-solaire.com/batterie-agm-12v-25ah-super-cycle-victron-energy-_r_572_i_1994.html

These batteries are not so expansive and seems to fit our needs.

WiFi relay prices

WiFi antennas will be loan.

Docs

What do we need

We can buy some stuff, but we would like to recover as mush as possible from motivated people :)

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