[RE-wrenches] cool fan

[toddcory at finestplanet.com]

thanks for the ideas jay!
 
the fan comes on and off with the aux output led on the board where the in/out ac wires connect, so i do not believe this is an issue with the fan.
 
as i mentioned below:
 

when i set the aux control from 'auto' to 'on' the fan comes on and stays on... well, mostly. it still cycles on and off, but less frequently.
 
 
i guess i could mount an external thermostat on the fx case and have this control a relay to operate the 'cool fan', but id really like to figure out why the unit is not performing as it is supposed to... and why outback's tech support seems so deficient these days. shouldnt someone have access to the code and be able to give me the temp counts for cool fan on/off and when the unit throttles back on selling from over-temp conditions?
 
todd
 
 
 
 
 
On Tuesday, August 27, 2013 8:47am, "jay peltz" <jay at asis.com> said:



Hi Todd
Is the relay cycling or could it be the fan is having issues?
Did you try manual on?
On a side note. For the turbo units in warm areas, I replace the fan with a high output AC fan controlled with relay, really helps.
Jay
Peltz power.





On Aug 26, 2013, at 10:21 PM, [mailto:toddcory at finestplanet.com] toddcory at finestplanet.com wrote:



 
 
wrenches...
 
im having a vexing problem with an outback system and cannot seem to get any help from outback... so, im posting this here in hopes some wrench knows more about the 'cool fan' option than i do.
 
this is a sealed gtfx2524 system... so it has the 'turbo fan' connected to the aux output which is set to "coolfan". i called tech support and the guy i spoke with was unable to find much about this so is sending out a control board as kind of a blind, "i hope this fixes it" solution... but, before i unwire and dismount the inverter for the second time (the internal fan died after 6 months of use), i thought id write and ask someone else.
 
here are the symptoms and parameters:
the grid tied unit is in a greenhouse so it gets hot in there (a couple of days ago it was 95 f).
at max, the unit processes around 1100 watts/minus local loads so sells around 900 to 1000 watts. the lowest (hottest) temp counts i have seen are:
air (xmfr) 88
fets 132
caps 136
 
during this "heat event" i saw the unit throttling back on selling, as the dc voltage went from 26 (sell voltage default set point) to 28, where the charge controller started throttling back... so i know it was running hot. during this the "coolfan" would cycle... on for a second or 2 and then off again for an equal time. when i set the aux control from 'auto' to 'on' the fan comes on and stays on... well, mostly. it still cycles on and off, but less frequently.
 
does anyone have access to the temp counts for:
when the "coolfan" is supposed to turn on and off &
when the unit starts throttling back on selling due to overheating &
when the unit will totally shut down from overheating
 
another strange thing is when i set the aux control from coolfan to vent or diversion, and program the parameters so the fan would be on (ie: vent fan / diversion "on" above 24 volts with the battery voltage at 26+) the fan does not come on.
 
guesses? will replacing the "control board" change anything? any help is appreciated.
 
thanks, todd


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