SW4048 giving me grief [RE-wrenches]

[Ezra Auerbach, Trace Engineering]

Hi all,

The HVD is indeed an adjustable setting to turn the inverter off if batteries reach a high voltage
condition.  It does not affect battery charging perameters which are set under different menu
headings.

As to the chargers, I agree with Steve. Best bet is for the person charging such a small load to
turn on a companion load which will take the inverter of search mode at the same time.
Ezra

"Kurt Nelson, SunWise" wrote:

> Back on the SW inverter problem from Donna and responded to by Steve.  I
> really like Steve's caution about cordless tool battery chargers.  Never
> thought of it that way, but with inverter cyclying in and out of sleep (I
> have seen this happen on may small induction loads), the tool battery
> regulator may not operate correctly.  I have a client who has adjusted his
> DR's sleep setting to where his cordless shaver won't wake the inverter, but
> receives power when another device wakes the Trace.  It has worked well for
> him but I could see the possible problem, espically if the inverter is
> cycyling as frequently as I have seen some do when connected to small
> cordelss chargers.
>
> On the battery bubbling, I am perhaps confused.  I thought Donna might be
> adjusting the HVD of the Trace itself, not the setting that is actually
> designed to regulate charging.  I don't have my manual in from of me, but
> there is a HVD setting that is set to shut off the Trace if the battery
> voltage should exceed design limits for the inverter.  If Donna was changing
> this setting while float or bulk settings were left high??  Maybe it would
> be good to reset the inverter to factory spec's and reprogram to new, well
> thought-out settings.
>
> Kurt Nelson
>
> At 08:52 PM 7/1/00 -0700, you wrote:
> >You set the HVD to 57 volts and its still bubbling the batteries.  You did
> >not say if the battery voltage was at 57 or had exceeded it?  If not
> >exceeded, its a function of the batteries, set it lower. If it has gone 1 or
> >2 or so volts over 57, it can be a function of the temp compensation in the
> >inverter, and you can set the voltage etc to account for that. Are you using
> >the temp sensor and is it attached to the battery?
> >
> >The drill chargers should not be having trouble on a sine wave in my
> >experience.  I have not heard of any interference by the Trace waveform of
> >SW to these but there are two other things that can do it that should be
> >easy to check.
> >1.  Did you check the actual AC voltage input to them? It happened with the
> >generator running so that could be a voltage factor. I did have one melt
> >down but the cause turned out to be that rain had flooded the Makita charger
> >overnight.
> >2. This may be the real answer:  If the inverter goes into search mode and
> >back out, cycling with a partial load from just the charger on overnight,
> >each time it starts up and shuts down it can reset the cordless tool
> >automatic charger to full bulk mode for a few seconds, so constant cycling
> >like that is a hazard to the chargers. And it will do that if the charger is
> >the only load.
> >
> >Steve Willey   www.backwoodssolar.com
> >Backwoods Solar Electric Systems
> >
> >----- Original Message -----
> >From: Donna Fischer, Amazon Power <amazonpower at hotmail.com>
> >To: <RE-wrenches at topica.com>
> >Sent: Saturday, July 01, 2000 7:20 PM
> >Subject: SW4048 giving me grief [RE-wrenches]
> >
> >
> >> Hi folks - I could really use some help.  I've now installed three SW4048
> >> inverters, two in one system, and in both cases they're overcharging the
> >> batteries.  On the first set I set the HVD to 57 volts and, after reading
> >> some of the comments here I set them on sell.  They're still bubbling the
> >> batteries!  The second set (both systems have 1165 ah Hup batteries) have
> >> been at 62 volts for a  few days.  It's a construction site and they're
> >> running a generator through the inverter.  Today two cordless drill
> >> batteries got fried while charging and the general contractor is upset,
> >and
> >> I don't have any real answers for him.  He wants me to go fix everything
> >and
> >> explain what's going on and I don't really know.  Help!
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