[RE-wrenches] Using a Midnite Classic for Hydro

[Windsine Inc.]

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.

Kinda like an Aux triggered bypass circuit

Roy Rakobitsch
NABCEP Certified Small Wind Installer®
NABCEP Certified Solar PV Installer®
NYSERDA eligible Small Wind installer
Certified Advanced Tower Climbing, Safety & Rescue
Wind/PV Design Engineer
Windsine LLC
631-514-4166
www.windsine.org


On Thu, Mar 19, 2015 at 11:53 AM, Jeff Oldham <starpower4u at juno.com> wrote:

> 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.
>
> 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:
>
> 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.
> 2) If so what is the secret, please?
>
> 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.
>
> With much appreciation for all input.
>
>
> From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative
> SOLutions
>
>
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