Rob:
You just confirmed what I said to Hugh about testing the hydro power by placing a resistor in series, you "REPLACED" it with a MX60 MPPT( and I am not Shouting) controller. Of course there are other types of charges one may use with the same results. I wonder how Hugh is going to Negatively respond to your message Nando ----- Original Message ----- From: "Rob Linschoten" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, February 14, 2005 10:40 PM Subject: Re: [microhydro] AC vs. DC microhydro > > > I am running a small (300W) crossflow turbine using a 1 hp 240V 3 phase Hyundai TEFC motor wired 1C-2C (about 800 feet from the battery, then stepped down to 60VDC via a toroid transformer, rectifier assembly and about 24,000MF of capacitance) and into an Outback MX60 MPPT controller to charge a 48VDC bank. Works like a charm. The MX60 finds the sweet spot for the turbine at any given head/load. I have a diverter on the 240VAC side set to 260VAC in case the MX60 "lets go" during the float cycle. > > Rob > > > ----- Original Message ----- > From: Nando > To: [email protected] > Sent: Sunday, February 13, 2005 12:39 PM > Subject: Re: [microhydro] AC vs. DC microhydro > > > > HUGH: > > I am not upset at all, and NOTHING has gone up my nose, just wanted to > clarify what has been done by many. > > Many times the efficiency may be allowed to go somewhat lower to attain > certain system or capabilities. > As you have done with wind mills, that as well may need load and level > controllers. > Hydros Turbine may need level controllers to maintain a precise output > voltage/power limitations as needed by the overall system. > > If you have not been successful then say it but indicate where you have not > been able to fulfill the expected parameters of the system. ( same for wind > mills and Hydros ). > > For small Turbine Hydro Electric Systems > > Induction motors as generators and transformer/rectifier systems NEED to > have the proper load impedance that has to be not like a "ZENER" load ( > Clamped Load) but like one with a variable load impedance to allow the > motor/generator to retain the power product given by the turbine -- which > means DO NOT overload the system or power clamp the output --.The > transformer/rectifier loading needs to be adjustable like Xantrex C40 > charger. > > Just to prove yourself : Setup the hydro with a transformer/rectifier with a > small resistor in series between the battery and the charger, this resistor > needs to set the maximum power drawn by the transformer/rectifier into the > battery and resistor = Current^2 * Resistor + Bat_voltage*Current. > Just a test -- so The CKT should have the capability to regulate the current > within the limitations of the system. > > Small systems, many times, DO need to have a load with MPPT capabilities > either DC or AC generated power. > > Regards > > Nando > > ----- Original Message ----- > From: "Hugh" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Sunday, February 13, 2005 12:28 PM > Subject: Re: [microhydro] AC vs. DC microhydro > > > > > > > > At 3:32 PM -0600 12/2/05, Nando wrote: > > > >>Just because you have tried 3 times with induction motors and failed to > >>get > >>the proper results you are FOUL MOUTHING the Hundreds or even several > >>thousands small hydro systems using induction motors as generators. Low > >>cost, Long Lasting, Easy to implement, Easy to control and maintain. > > > > I am sorry, I had no intention of being foul in any way. I intended > > to be helpful. If you know of a successful example using an > > induction generator and a transformer/rectifier, please could you > > tell me the efficiency? and suggest where I may have gone wrong? My > > turbines were not stalling, and I experimented plenty with the > > excitation but could never get any of them producing more than half > > what they should. This is also typical of other systems of this sort > > that I have heard of. > > > > I have had great success using induction motors (with controlled AC > > output) feeding synchronising sine wave inverters, but then I have > > the extra cost of the controller. I have had great success with high > > voltage permanent magnet machines and transformers. Hydro power is > > very easy compared to windpower. But induction motors and > > transformer/rectifier battery chargers are not so easy at all. > > > > A heavy cable is often cheaper and more efficient than a transformer, > > so I thought I ought to mention that fact. I also mentioned that he > > could use either a stream engine or a multi-jet pelton on that site > > and either would work well. Everything I said seems to have got > > right up your nose. > > > > I seem to have upset you, Nando and for that I am most sorry. If I > > have upset anyone else then I am sorry for that too. I only tried to > > be helpful by relating my own experiences, but in future I will > > probably not risk it. > > > > best wishes, and bye bye. > > -- > > Hugh > > > > > > > > > > > > > > Does your company feature in the microhydro business directory at > > http://microhydropower.net/directory ? 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