Author Topic: Davis Vantage Vue ISS Capacitor Replacement  (Read 184 times)

0 Members and 1 Guest are viewing this topic.

Offline gmu

  • Member
  • *
  • Posts: 22
Davis Vantage Vue ISS Capacitor Replacement
« on: May 23, 2020, 02:26:05 PM »
The battery on my Vue ISS lasts about a week now.  I have a spare ISS and compared the battery current draw whilst charging the capacitors, indoors without the solar cell going.

The battery of the problem ISS charges the supercap (after it's fully charged) every second or so at 25mA whereas the charge top up on the good ISS lasts a lot longer before it drinks a lot less from the battery again.  So I decided to replace the supercap, hoping this will solve the problem.

Being a G version ISS (round cables instead of ribbon cables) everything is potted at the transmitter so I decided to dig out the supercap using a a router.  Unfortunately on the second pass I slipped a bit and also took out part of two adjoining capacitors. 

The reason for this post is to let people know that it would have been possible to just dig out the supercap after one pass and not have the extra work of replacing the two 1000uF 6.3v caps.

Attached is a photo of the mess I made which I hope others can avoid.

-------

I plan to replace the 10F supercap with one rated at 50F which should give approximately 7 days' worth of charge (according to an ebay listing).  Interestingly, this link compares the storage capacity of a 3000F capacitor bank to a 2500mAh AA rechargeable battery and they're nearly equal.

https://www.instructables.com/id/Supercapacitor-Solar-Box/



 [ You are not allowed to view attachments ]
« Last Edit: May 27, 2020, 04:37:42 AM by gmu »

Online galfert

  • Global Moderator
  • Forecaster
  • *****
  • Posts: 4679
Re: Davis Vantage Vue ISS Capacitor Replacement
« Reply #1 on: May 23, 2020, 02:49:37 PM »
I've seen other people avoid this by leaving the old super capacitor in place and just cutting the leads then finding a new mounting place for the new super capacitor. There is a picture of this method floating around this forum. I searched and couldn't find it though.
Ecowitt GW1000 | Meteobridge (WeatherBridge)
WU: KFLWINTE111  |  PWSweather: KFLWINTE111
CWOP: FW3708  |  AWEKAS: 14814
Windy: pws-f075acbe
Weather Underground Issue Tracking
Tele-Pole

Offline gmu

  • Member
  • *
  • Posts: 22
Re: Davis Vantage Vue ISS Capacitor Replacement
« Reply #2 on: May 23, 2020, 03:03:24 PM »
Yep a properly positioned 1/2" diameter excavation from a router bit might do it. I just didn't have any information about the transmitter except a rough idea of where the cap was.  The G version ISS is fully potted and that black rubber plug with the two terminals is what's left of the supercap.  In prying out those two adjacent caps the potting tore out the wires from the nearby black sensor cable, which happens to be the T/H/Speed cable  #-o 

You are probably referring to this post about super cap replacement:
http://www.wxforum.net/index.php?topic=24561.0


Here's a thread on a different forum in which the poster did an excellent job of it.
https://forum.meteoclimatic.net/index.php/topic,532.45.html



« Last Edit: May 24, 2020, 10:19:56 AM by gmu »