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<div class="moz-cite-prefix"><br>
Jeff, I am sorry you did not get a proper answer from tech
support to a very basic question like this.<br>
I don't know who you talked with so we will flog all of them
equally.<br>
<br>
I am glad that particular sentence was removed from the manual as
it was not correct. You can only<br>
keep the charge controller ON if it is safe for the batteries to
do so.<br>
<br>
The reason that the Classic goes to resting is because raising the
input voltage is (usually) the only way to<br>
reduce battery voltage and current on its own. Insomnia will not
keep the Classic operating above 250 volts<br>
input... What "Insomnia" does is to keep the Classic from going
to Resting due to low power output (< ~20 watts).<br>
It won't help when the batteries are full or over full.<br>
<br>
Since you are VERY slightly over 250 volts when free-wheeling, the
first thing I would try is to turn OFF<br>
the Classic mode and adjust the nozzles or flow to the turbine
until it drops below 250 volts. Then no<br>
matter what, it will turn on... That is, as long as the water
flow does not increase too much to cause<br>
the voltage to rise above 250 volts again when nobody is looking.<br>
<br>
Another thing that can be done, or in addition to reducing the
free running Voc is to lightly load the<br>
turbine with a resistor. Better yet, use 2 or 3 resistors to
load the AC side a wee bit. This works well<br>
especially if the Max Power Point voltage is quite a ways below
the Voc so these resistors don't have<br>
to dissipate all that much power. I would think that this method
would not be necessary though.<br>
<br>
NEXT thing to do is to adjust the Classic's battery charge set
point voltage to somewhat higher<br>
than that of the FM charge controllers so that the Classic is
almost always charging (when not in Float).<br>
OR, adjust the FM60/80 charge voltages slightly lower than the
Classics' set point voltage.<br>
Or, a compromise, one slightly higher than wanted and the other
slightly lower charge voltage<br>
to give both systems that "distance" between them. This way, the
FMs will always be helping out<br>
in MPPT modes and Absorb/Float just won't matter much where that
current comes from.<br>
This method will mean that the Classic is always loaded some
except for those times when the<br>
charge current required from it is zero or very close to zero.<br>
<br>
Roy Rakobitsch also has a good idea which is closer to being a
Clipper by using a 3-phase AC SSR,<br>
(3 Triacs), connecting all 3 phases of the turbine together.
Doing this on the AC side is important.<br>
You don't want to short out the rectified DC input to a charge
controller for various reasons.<br>
If you go this route, the best control is to use Aux 2. Be sure
to go to Clipper mode to make<br>
sure it is set to AC mode. You could then use Clipper mode or PV
ON HIGH mode using<br>
higher frequency PWM activation of the SSR. I like the Teledyne
3-phase triac SSRs personally<br>
if you decide to go this route.<br>
<br>
First, just turn down the flow slightly to reduce that free
running Voc. That is probably the<br>
quickest, simplest and cheapest method.<br>
<br>
boB<br>
<br>
<br>
<br>
<br>
On 3/19/2015 10:26 AM, Windsine Inc. wrote:<br>
</div>
<blockquote
cite="mid:CAL2u1udXMgUZXMx4-dxBKzjU2dJwDkVA8nnYVCboRifdeuTf1Q@mail.gmail.com"
type="cite">
<div dir="ltr">
<div class="gmail_extra">You could use a triac to feed AC from
turbine directly to the dump load just before HyperVOC using
the Aux relay in classic to fire the Triac. Then program the
Aux logic to revert to normal when turbine voltage/RPM drops
from dump load loading.</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">Kinda like an Aux triggered bypass
circuit</div>
<div class="gmail_extra"><br>
</div>
<div class="gmail_extra">
<div>Roy Rakobitsch</div>
<div>NABCEP Certified Small Wind Installer®</div>
<div>NABCEP Certified Solar PV Installer®</div>
<div>NYSERDA eligible Small Wind installer</div>
<div>Certified Advanced Tower Climbing, Safety & Rescue</div>
<div>Wind/PV Design Engineer</div>
<div>Windsine LLC</div>
<div><a moz-do-not-send="true" href="tel:631-514-4166"
value="+16315144166" target="_blank">631-514-4166</a></div>
<div><a moz-do-not-send="true" href="http://www.windsine.org/"
target="_blank">www.windsine.org</a></div>
<div><br>
</div>
<div><br>
</div>
<div class="gmail_quote">On Thu, Mar 19, 2015 at 11:53 AM,
Jeff Oldham <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:starpower4u@juno.com" target="_blank">starpower4u@juno.com</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">
<div>Finding this application quite frustrating - Harris
120Vdc 1kW turbine, Classic 250, 48V batt., 1200W load
dump. The manual downloaded just before purchase stated:
"This mode will NOT go to resting even when the input
has been disconnected and will always stay awake so the
turbine has the least chance of over-spinning." It now
seems that this is not the case and this sentence is no
longer in the manual. My installer cannot get Midnite to
confirm one way or the other and they have been guessing
for over a month on how to keep the CC from going into
RESTING that open circuits the hydro and puts the CC
into hyperVOC at 253V and will never reconnect. To
complicate things there is also ~4kW of PV on FM60's,
when they drive up batt V. to above what the Classic
wants it drops into RESTING and back into HyperVoc.
Midnite has been very responsive and have suggested
every possible setting and combination and my installer
has made the 3 hour RT drive far too many times to only
find the most recent "suggestion to try" another
approach not working. INSOMNIA does not do as the name
implies and still allows the CC to step out if external
charging elevates the V above what the Classic wants.
i.e. FM60 in Bulk, Absorb or EQ. when the Classic wants
to Float. </div>
<div> </div>
<div>I fully realize that the Clipper will deal with this
for a considerable amount of money, but I've heard of
several folks using a Classic or Outback w/o a Clipper
to deal with turbines w/o allowing freewheeling and
runaway VOC. If the turbine is not dropped by the
Classic the VOC will never exceed 120Vdc. Is there
anyone of you out there that knows:</div>
<div> </div>
<div>1) Is there a way to keep a Classic from ever moving
into RESTING, a true INSOMNIA? If it will not do as
originally stated in the manual I need someone to step
up and say so, so we can stop guessing and wasting time.</div>
<div>2) If so what is the secret, please?</div>
<div> </div>
<div>I really like all of Midnite's products and they are
better than most with reasonable prices, support has
always been 1st rate. This application oddly seems to
have all of us at a loss pulling our hair out and losing
money.</div>
<div> </div>
<div>With much appreciation for all input.<br>
<br>
<br>
From the Solar, Wind and Hydro powered office of Jeff
Oldham/Regenerative SOLutions</div>
<br>
<br>
<font color="#000000">____________</font><br>
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