Digest for RE-wrenches at topica.com, issue 1164 [RE-wrenches]

[Steve Willey, Backwoods Solar]

Hey Sharkey: The plan for testing with two T-105 batteries woke me up.  I
remember testing a water well pump on a DR inverter with a "quick" set up of
small batteries, where the pump would not start.  However with a full
battery bank later installed, the same inverter WOULD start the same pump.
Two T-105 in series can supply large currents, but voltage drop is a lot
more than with a larger bank of 4 T-105 or two L-16, and can affect the
result.

Also beware the pump, if new, will be harder to start than after it has a
few hours on it. Some 120 volt pumps we sell will NOT start on the 1500 watt
inverter until after run a few minutes on a generator.  Then and thereafter,
they do start on the DR1512. But if its that close to the edge, perhaps a
larger inverter would be in order.
Steve Willey       steve at backwoodssolar.com
www.backwoodssolar.com

Date: Tue, 01 Jul 2003 22:45:37 -0700
From: Sharkey <sharkey at mrsharkey.com>
Subject: RE: Induction motor on Trace DR series

Thanks for the replies, both on-list and off. Seems like the consensus is
that the 1.5Kw DR series will be a bit small for the job.

We'll be finding out about that tomorrow, as I have the inverter "on
approval", and will assemble the pump enough to cycle some fuel through it
for a test. First we'll plug into the SW2512 (running on 2,000 Ah of lead
acid) to get some idea of DC draw under sinewave, then assemble the DR
system using a pair of venerable, but stout T105's that I have around for
such projects. They will still supply enough current to cold start my
Cummins 262 turbo diesel, so I think that a ½ AC motor shouldn't be too
much of a load for them.

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