MOTENERGY owner has been so kind to send to me the parameters of the 300
watts -- small hydro electric TURGO TURBINE he has selling in EBay.
I have done the basic analysis and the capabilities of the little Turgo
This is what I have calculated:
The 300 watts turbine with a PCD= 8 cm = 80 mm = 0.08 meters to produce 60
HZ which represents 1800 RPM ( PMA is a 4 pole generator)
20 MM - 2.0 CM = 0.02 ME = Maximum diameter of the Spear Nozzle.
1800 rpm/ 60 sec = 30 RPS
RPS * Pi * PCD = 0.48 * sqrt[ ( 2 * 9.81 * Head(meters) ) ]
To make the calculations simple Head = [(30 rps* 3.14 * 0.08 meters )
/0.48 ]^2 / (2 * 9.81) = 12.57 meters
So the small turbine needs a head of 12.57 meters to produce 60 HZ
To produce 300 watts with the 12.57 meter head
H2Ovel= sqrt ( 2 * 9.81 * 12.57 ) = 15.70 m/s = 1570 cms/sec
Power = head * vol * 9,81 * efficiency , we can assume an overall value of
6 = 9.81 * efficiency to obtain a needed volume
300 watts = 12.57 * vol * 6 ; Volume = 300/( 12.57 * 6 ) = 3.977 l/s = 4
There is the possibility that the overall efficiency is greater so let's
assume that 9.81 * efficiency = 7; so to obtain 300 watts the volume will
Vol = 300 /( 12.57 * 7 ) = 3.41 l/s are required to harvest 300 watts.
Maximum available water flow at 12.57 meter head =
1570 * PI * ( 2/2)^2 = 4.93 l/s
so if the site is 12,6 meter head with 4 l/s the output will be 300 watts
@ 60 HZ , We may assume that at this moment the controller starts to load
the generator to keep it at 120 Volts and 60 HZ
Therefore 120/1800= 0.07 volt/revolution of the PMA
To produce let's say 58 volts the RPM will be 58/0.07 = 828 RPM producing
58 volts AC , to avoid over heating the current should be limited to
828/1800 = 0.46 of 300 watts or = 138 watts
Of course there are other tricks to produce different power like to use
transformers to convert to different voltages as needed insuring that the
power generated is not more than 300 watts if the RPM are above around 1600
At 300 watts production the current would be 2.5 amps producing 120 volts --
so we can do an analysis to see what type of power can be delivered at
different heads and maximum water flow remembering that the flow maximum
depends on the head and an example if the site has let;s say 25 meter head
the maximum flow would be
H2Ovel= sqrt ( 2 * 9.81 * 25 ) = 22.15 m/s= 2215 cms water velocity
Volume = H2Ovel * 3.14 * 0.5*Nozzle-dia^2 = 2215 * 3.14 * 1 = 6.96 l/s --
wrong use of this little turgo because with 25 meter head and 7 l/s the
power available would be around 1 kw .
So the unit is geared toward less than 300 watts with the premises that the
head is around 13 meters as a maximum with a water volume in areas of
around 3.5 liters with the possibility of using around 4 l/s with less head
and remembering that the water volume used is dependent in this case on the
20 mm maximum diameter of the spear valve and the head of the water source
that produces the water velocity to generate a maximum water flow.
----- Original Message -----
From: "Nando" <nando37@...>
To: "MICROHYDRO@" <email@example.com>
Cc: "John Fiorenza" <sales@...>
Sent: Sunday, August 19, 2012 09:32
Subject: 300 WATTS -- SMALL HYDROELECTRIC TURGO TURBINE - 120 Vac 60 HZ
> I have been searching EBay for some turbine products when I found this
> item being sold by Motenergy.com
> This unit seems to be plastic made, inclusive the turgo turbine and there
> is a metallic ring above the turbine that could be the ballast load
> resistor that maybe used to control the output voltage when the water
> volume and head are above the needed to harvest the 120 Vac - 300 watts
> I do not have any information available besides what the EBay page says
> but seems to be a simple to install and operate hydroelectric turgo
> turbine capable of producing 300 watts with a PMA alternator that
> includes, as well, a ballast controller and resistor when the output
> voltage reaches above the 120 volts AC - 60 HZ .
> The turbine does not have a energy curve to determine what head is really
> required to have the wanted 120 Vac , though if the head is lower the
> Vac voltage may be lower .
> It is a single Nozzle with a 2 inch= 50 mm pipe with an adjustable spear
> valve feeding a 5 inch diameter turgo ( the PCD = Pitch Center Diameter)
> it is not indicated,so we can not calculate what head and volume is needed
> to be able to produce the 120 Vac and 300 watts output power level.
> Due to the PMA alternator ( generator) the output can be usable to produce
> lower Vac voltages that with the proper transformer the down converted
> voltage can be used to charge batteries like 12, 24 or 48 volts
> If the water site is capable of setting this little turbine to maximum
> power the enough energy using electronic fluorescent lamps or LEDs types
> can be used to have general home lighting -- directly fed by this little
> turbine .
> Also for those that have 240 volts AC systems either a small transformer
> to convert to 230 Vac to produce in this case, close to 285 watts (
> assuming 15 watts transformer conversion losses)
> I am copying this to the motenergy.com owner to see if he can supply the
> PCD of the Turgo turbine to be able to then calculate the heads necessary
> to produce the watts and voltages that can be obtained from this little
> unit that seems quite interesting.
> The general information given by the EBay seller does not allow to
> properly seat down and analyze how practical the little turbine is for
> smaller water sources that some rural home may have available since quite
> a few of those water sources are used to feed water to the house can be,
> as well, be used to produce some additional electrical power that in many
> cases is enough for many that have limited energy source supplies -- This
> little unit in a sense can replace up to about 7 KWH of daily solar
> panels if the water volume and head can be capable of maximizing the 300
> If there is some interest on this turbine and anyone needs additional
> information to be able to be used with transformers and rectifiers to
> charge batteries -- let me know to draw a circuit capable of doing such
> job charging diverse battery voltages.
> I do not have any financial interest with this product or site.