[RE-wrenches]

[John Mottl]

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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