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Posted by E Z Peaces on May 18, 2008, 3:55 pm
Please log in for more thread options Solar Flare wrote:
> Very high currents would demand massive sockets larger than the capacitors.
>
>>>
>>>> Bruce in alaska wrote:
>>>>>
>>>>>> Thanks, everybody, for the advice. My BIL says he turned off the
>>>>>> search
>>>>>> mode months ago, and he turns on a light before trying to start the
>>>>>> washer.
>>>>>>
>>>>>> It sounds as if the inverter has changed. I imagine an electrolytic
>>>>>> capacitor could cause the problem. At one time, they were commonly
>>>>>> mounted in sockets for easy testing and replacement.
>>>>>>
>>>>>> I'll ask him if it's under warranty.
>>>>> I can tell you from experience, that there are NO Socketed Capacitors
>>>>> in a Trace SW 40xx Inverter/Charger. Having owned, operated, and
>>>>> maintained a Trace SW4024 for the last 12 years, as well as generating
>>>>> ALL my own power for the last 30 years, you can take the above to the
>>>>> Bank.
>>>>>
>>>> Are there electrolytic capacitors? My BIL says the engineer who
>>>> designed his windmill-powered system is baffled.
>>> There are some "electrolytic capacitors" on the Main PCB in the Trace
>>> SW40xx Series Inverter/Chargers, BUT they are soldered to the PCB, and
>>> definitely NOT socketed.
I didn't ask if there were socketed capacitors in this equipment. I
referred to the past practice because designers knew electrolytic
capacitors had limited lifespans and unsoldering for troubleshooting
would be time-consuming and lead to complications. I'd say capacitors
are suspect in an inverter that doesn't produce as good a sine as it did
new. My BIL has a capacitance meter but nothing for in-circuit checks.
>> I have never seen socketed capacitors in any commercially built equipment.
>> I think most engineers would consider socketing capacitors to be bad
>> engineering practice. It would just produce problems
>>
Wildcat Electronics makes surface-mount capacitor sockets. The DFI
LanParty Dark P35-T2RS Socket 775 Motherboard has a capacitor socket.
I haven't encountered a capacitor socket in a long time, but I'm glad to
find electrolytic capacitors that don't need solder. The one in my 240V
A/C compressor uses nuts and ring terminals, which made it much easier
to check when I wondered why the compressor wouldn't start. I don't
know of any motor-start capacitor that's soldered.
Some loudspeaker crossovers use capacitors with quick disconnects.
Others solder the capacitors but use quick disconnects for the crossover
boards and drivers. Through increased ESR or decreased capacitance, an
electrolytic capacitor may go bad long before a driver. I think
soldering them is bad design, especially when the crossover board is
glued in the back of the box.
Sockets for taillights cause problems, but they don't *just* cause
problems. They also make troubleshooting and repair easier. Why would
it be different for electrolytic capacitors?
I don't know where to answer the top post, but the starter circuit of a
car is disigned for perhaps 100 amps at 0.1 ohms. Connections aren't
soldered and they aren't massive.
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