[RE-wrenches] Modified sine deterioration

[Dan Fink]

Drake;
I have never seen power quality deterioration, and I still have a couple DR
inverters in the field, along with some even older gear. (DRs vulnerable to
lightning) My experience has been motors, CFL ballasts etc deteriorating,
possibly from the modified square wave,  and newer appliances just not
wanting to play nice with MSW at all. In sneaky ways, too -- for example
 new fridge *seemed* to work fine but the computer inside that controlled
the auto defrost cycle wouldn't run on MSW. After 2 weeks, fridge at room
temperature, freezer at 35 below zero. etc.

Dan Fink,
Executive Director;
Otherpower
Buckville Energy Consulting
Buckville Publications LLC
NABCEP / IREC accredited Continuing Education Providers
970.672.4342




On Tue, May 20, 2014 at 8:24 AM, Drake <drake.chamberlin at redwoodalliance.org
> wrote:

>  Hello Wrenches,
>
> We are diagnosing a system with a 20 year old Trace DR 1512 inverter.
> Recently a motor burned out that had been running on the system. I do
> understand that modified sine (modified square) wave inverters are hard on
> motors in general.
>
> My question is, "does the quality of the Mayan Pyramid sine wave
> deteriorate with time as the capacitors dry up, or for any other reason?
> Would the power quality be expected to have declined on an old unit like
> this?
>
> Thanks,
>
> Drake
>
> Drake Chamberlin
>
>
>
>
>
> *Athens Electric LLC OH License 44810 CO License 3773 NABCEP Certified
> Solar PV 740-448-7328 <740-448-7328> *http://athens-electric.com/
>
>
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