Recent Posts

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Weather / Re: Been about a year
« Last post by Pete on January 19, 2020, 12:57:29 am »
Hi BJ, there does seem to be a lack of temperature around your way at this time of year.
Here we rarely see it go below 0c. Most of our winter days are in the 3 to 5 degree range.
Not sure if i would get much done at minus 30c. I would actually have to rug up a bit for that.
Here I just wear a T shirt and a poly jumper most days.
Anyway I guess it is indoor job weather for you at the moment. I feel for the tradies who have
to work outside though.
Pete
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Steve / Re: My Scratch Pad
« Last post by bj on January 16, 2020, 11:13:10 am »
     Mastercard Maze?  Where mine should have been during the yearly Christmas spend season. ;)
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Weather / Re: Been about a year
« Last post by bj on January 16, 2020, 11:09:27 am »
  Hi David:   Wish I was there as well.   Actually, we were, last April.  Did a ten day cruise.
  Wonderful country, wonderful weather, wonderful people.
  bj
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Weather / Re: Been about a year
« Last post by David HK on January 15, 2020, 01:48:19 am »
Hello bj,

Here in Hong Kong we have blissful weather. Today the ambient temperature is around 24 degrees Celsius and in the region of 45% humidity. The sky is open blue and there is a slight breeze.

Wish you were here!

David
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Weather / Re: Been about a year
« Last post by noneyabussiness on January 14, 2020, 05:21:45 pm »
Wow... lol, don't have pics, but we have been opposite, 34-36 °c and 110% humidity ( ok, that may be a exaggeration, but you get the hint)..
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Weather / Been about a year
« Last post by bj on January 14, 2020, 09:54:49 am »
   Not quite--11 months?
  Once again we are approaching -40, C or F
  Supposed to last about a week.
  Not really complaining though, as up to this point it's been a really nice winter.
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Automation, Controls, Inverters, MPPT, etc / Re: 2019 48v/15kw Sort-of Powerjack
« Last post by dochubert on January 13, 2020, 10:27:58 am »
Since I got the rubber wheel for spacers under the transformer of the dual lcd big inverter, figured I might as well cut 4 more for this little inverter too.  This inverter will probably never output what the bigger units do, but getting rid of the heat efficiently gives it the best chance to provide a useful output.

8437-0

8439-1

Not ready to repair this one just yet, but this needed doing anyway.

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Automation, Controls, Inverters, MPPT, etc / Re: Just got my new 48v/15kw powerjack
« Last post by dochubert on January 09, 2020, 05:06:49 pm »
Hi All,
Found this 1 inch thick rubber wheel at an estate sale for 50 cents.
8433-0

Cut 4 wedges like the one in this pic and put them under the transformer (minus the bracket also)
8435-1

Hard to get a pic that shows the wedges under the trans but you get the idea.  Once its in place this inverter won't be moved so no need for transformer brackets that hold in heat.
Next is to mount a fan on top of the transformer and change the fan behind it.  The wedges give room for airflow through and under, hopefully allowing use of slower, quieter fans.  The two transformer fans will be on whenever the inverter is on. The back fan will be 2 speed kicked up to high speed by independent temp control, sensed on the transformer.
The other 2 fans, one behind each mainboard, will be series connected to slow and quiet them.  They will still operate when the pj control says to, but each mainbord will have an independent temp controller sensing it.  Either controller will turn on both fans.  Should be adequate cooling, but will adjust as necessary.
That's 3 temperature controllers I'm adding to this inverter.  I do like to know what's going on at a glance.
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Automation, Controls, Inverters, MPPT, etc / Re: Just got my new 48v/15kw powerjack
« Last post by dochubert on December 31, 2019, 02:54:09 pm »
Hi Solarnewbee,
I think the temp switches powerjack uses are 45 degree C.  Too hot for me.  (I like to have fans kick in around 37-38C.)  How much load are you running?

Yes my fans are 48v on this inverter.  Used to be true that whatever voltage your inverter runs on, your fans would be that voltage also.  These days you can't be sure what voltage fans powerjack is putting in their inverters.  The Upower (powerjack clone) 48v/15kw inverter came with a 12v fan, which must mean the fan voltage at the control board is selectable.  There is no obvious selection point, though.  I was told by Sean at Genetry Solar that powerjack was going to standardize, 12v fans on all inverters.  Either that is not correct or they are still switching over.  Perhaps using up old stock.

I vaguely remember when powerjack was selling generators.  Didn't know they were available with a 48v output or I might have bought one myself.  Apparently not selling them these days.  Nobody on ebay seems to have one with 48v.  Guess I'll eventually have to make my own like Pete and some others have done.


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Automation, Controls, Inverters, MPPT, etc / Re: Just got my new 48v/15kw powerjack
« Last post by Solarnewbee on December 30, 2019, 11:40:03 pm »
Hey doc,

My 2 main power board fans are controlled by a snap sensor that resembles a to-220 transistor just bolted to the heatsink. I don’t remember the Celsius setting on it but it turns on quite often since I moved it over. The control board only controls the fan behind the coil that’s a regular pc fan. The other 2 are 24vdc. Yours might be 48vdc ?, 10-25w resistors might be in order for speed change I’m guessing.

On another note I bought this a few years ago to run on propane as backup. I think Oz bought the 48v version. Never did get a chance to install it.

SN
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