Exeltech noise and subject lines [RE-wrenches]

[William Miller]

Kids:

We need to use appropriate subject lines.  Without them, we haven't a ghost
of a chance of finding this information in the future.  We will then repeat
ourselves even more than usual.

William Miller


At 05:26 PM 7/16/02 -0700, you wrote:
>We have found that the Exeltec Inverters have in the past had poor filtering
>on their inputs. Noise on the DC line either from a Trace inverter or other
>source will cause these problems. The DC input noise will pass through the
>Exceltec. This noise will only show up on the Exeltec inverter and not on
>other inverters in the same system. There are DC input filters (expensive)
>that we used to solve the problem with 1500 to 2500 watt Exeltecs. Your
>problem could be elsewhere but... we have had what is described above happen
>in the past. Contact me off list if you want to know more.
>Cordially, John Mottl
>
>
>----- Original Message -----
>From: "David Palumbo, Independent Power & Light" <ipl at sover.net>
>To: "Wrenches" <RE-wrenches at topica.com>
>Sent: Tuesday, July 16, 2002 2:53 PM
>Subject: [RE-wrenches]
>
>
>> We recently installed a small off grid 24v PV system utilizing an Exeltech
>> XP1100 sine wave inverter and an Iota DLS 24v 25 amp battery charger. The
>> system also has an Iota automatic generator transfer switch. The system
>has
>> 245 ahrs of battery storage and is grounded according to our standard
>> procedures.
>> It is installed in a small home that previously operated on gas lights and
>a
>> small generator (Honda 3k inverter gen) for TV, microwave etc.
>>
>> The television is picking up interference from our system. With the TV
>> powered by the inverter it has some audible static and visual snow, and
>> diagonal lines that were not there when the Honda ran the TV all alone.
>When
>> the generator is run (without battery charger for now), and the
>autotransfer
>> switch loads the gen with the TV, the TV picture and sound are no better
>> until the inverter is actually shut off. At this point we are back to the
>> original TV picture and sound before our system was installed. When the
>Iota
>> battery charger is on the TV is at its worse state of picture and
>> interference.
>>
>> The tech help at Exceltech suggested that the 6 foot run to the inverter
>> using #6 AWG cable (1% voltage drop at 1,000 watts)is too far, that
>placing
>> the inverter directly on top of the batteries would clear up the problem.
>> This we just can't do although we did twist the cables around each other
>as
>> also suggested. No relief. The inverter is seperated from the TV by a wall
>> and by a distance of 16'. The batteries are located in a battery box in
>the
>> same large room as the TV and are 14' away.
>>
>> The tech help at Iota offered that earlier models of the charger had
>> interference issues but that these had been addressed in the newer
>versions
>> (we are told that we have a newer version as indicated by the blue line
>> under the Iota model number). It was suggested that a jumper wire be added
>> between the DC negative input to the charger and the ground terminal
>> (creating a ground loop). Again, no relief.
>>
>> Any thoughts?
>>
>> Barry Shaw
>> Independent Power & Light
>>
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>
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>

__________________________________________________________________
William Miller
Miller Power and Communications
PO Box 50, Santa Margarita, CA 93453
Voice :805-438-5600		Fax: 805-438-4607	VMail: 805-546-4875
email: wrmiller at slonet.org
http://millerpowerandcomm.com
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