[RE-wrenches] Intermittent charge 4024

[bob at midnitesolar.com]

You can replace the internal SW fans (if the fans themselves are the 
problem.)

BUT the replacement fans must draw approximately the same current as the
original fans because they are powered by a current source rather than 
voltage
source.  i.e. If you  use a fan that draws less than the fan current, 
the voltage
could rise too high.   Some 12V fans don't have a problem running at say,
20+ volts DC BTW so might not be that big of a deal.

boB


On 11/3/2016 7:57 AM, Jay wrote:
> Hi Mac
>
> No don't recommend replacing internal fans
>
> But I have installed external 120v muffin fans on the ends.
> Seal up the vents around the ends so it pulls air through.
> Hook the fans to the genny input.
> Quick and works well
>
> Jay
>
> On Nov 3, 2016, at 7:09 AM, Mac Lewis <maclewis1 at gmail.com 
> <mailto:maclewis1 at gmail.com>> wrote:
>
>> Hello Wrenches,
>>
>> I recently assessed a 22 year old Trace 4024.  During bulk charge 
>> mode, I noticed that the charge would go from about 18A down to 5-6A 
>> every 15-20 seconds, and then repeat the cycle.  I observed this for 
>> about 5 minutes relatively consistently  I also noticed the body of 
>> the 4024 was very hot, and I couldn't feel a fan moving air through it.
>>
>> I put a fan on it and blew air over the body of the inverter, trying 
>> to direct it through the machine.  While I did that, I never observed 
>> it drop out again over about 5 minutes, so I'm assuming that there is 
>> an internal cooling fan that has gone out.
>>
>> It's been quite a while since I opened one of these up.  Does anyone 
>> know what's involved in replacing a cooling fan on one of these?  Is 
>> it worth it on a 22 year old inverter?
>>
>> Thanks in advance
>>
>> -- 
>>
>>
>>
>> Mac Lewis
>>
>> *
>>
>> "Yo solo sé que no sé nada." -Sócrates
>>
>> *
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