[RE-wrenches] Using a Midnite Classic for Hydro

Thu Mar 19 14:11:47 PDT 2015

I'm sure somebody more knowledgable already mentioned this, but back in 
the last century, when wiring up C40 charge controllers for micro hydro, 
they were wired between the battery and the dump load, not between the 
hydro unit and the batteries.  Basically the turbine ran fully loaded 
all the time, and when the batteries were full it started sending a PWM 
regulated current to the resistor bank.  I was always under the 
impression that letting turbines (wind or hydro) free wheel was a really 
bad idea.
Again we don't do a ton of hydro, hence my initial disclaimer.

R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760

On 3/19/2015 1:58 PM, Dan Tittmann wrote:
>  would try contacting Deric @
> http://www.homehydro.com/
> he likely will be able to help you.
> *hipower at asis.com <mailto:hipower at asis.com>*
>
> Daniel Tittmann
> CTO
> Greenwired
> www.greenwired.com <http://www.greenwired.com>
> daniel at greenwired.com <mailto:daniel at greenwired.com>
> 707-923-2001 (office)
> 707-206-5088 (Cell)
>
> On Thu, Mar 19, 2015 at 11:26 AM, Windsine Inc. <windsine at gmail.com 
> <mailto:windsine at gmail.com>> wrote:
>
>     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 <tel:631-514-4166>
>     www.windsine.org <http://www.windsine.org/>
>
>
>     On Thu, Mar 19, 2015 at 11:53 AM, Jeff Oldham
>     <starpower4u at juno.com <mailto: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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