Hi Ricardo, Duncan and all:
Duncan hint is another good one. I think that solution with IMAG'S and IGC's is cheaper than a pico hydro DC-Inverter combination for greater power, but I havn't no numbers rushed about that comparison. Carlos ------------------------------------------------- ----- Original Message ----- From: "hwmdu" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Wednesday, December 22, 2004 7:09 PM Subject: [microhydro] Re: Looking for pico I.G.C. Hi Ricardo, I have played with induction generators and ended up using DC instead. DC is low safety risk, tolerates variable flow, directly charges batteries. Use a large battery and an inverter if you need AC. Main disadvantage of DC is cabling if the turbine is remote. The purpose of the IGC is to keep the load constant. This keeps rpm, frequency and volts constant. I'm not sure of Nigel's book, but this can be achieved by using two way switching on every load and connecting to a dummy load when the device is switched off. For example a light bulb to light the room or an equivalent power water heater when off. This is a relatively low tech solution. A voltmeter to keep track of voltage is also necessary. An uninterruptible power supply(UPS) is vital to protect sensitive electronics if you try this technique. These are often available cheap when the batteries are shot. A quality modern UPS should have power factor correction, so should make a good load for an induction generator. The best UPSs can take a wide input voltage range and generate a steady sine wave output without using the batteries. You may find that you can use such a UPS in place of an IGC, possibly using some load compensation by two way switching for large loads. You will need to provide capacitors across the motor terminals to provide magnetising current. A UPS will also help if you want to drive induction motors. I have replaced dead UPS batteries with a much larger bank of good batteries. This seems to work fine, the UPS acts as a battery charger and inverter combined, but the charging rate is limited. The manufacturer would object of course. If you are not certain on safety aspects stick to low voltage DC. Duncan Irvine. --- In [email protected], Ricardo Tsukamoto <[EMAIL PROTECTED]> wrote: > > Dear colleagues, > > I need to provide electricity to two houses used for biological research > in the Brazilian rainforest. For that, I�m assembling a picohydro > installation using an induction motor (1 HP trif. 220 VAC) as generator > directly coupled to a turgo turbine (supplied by Joseph Hartvigsen), and > following instructions given in the books by Nigel Smith (Motors as > Generators) and Phillip Maher (Pico Power Pack). > > I was able to acquire almost all the components, but just could�n get > the electronic load controller (Induction Generator Controller) of the > type devised by Prof. Nigel Smith. > > Accordingly, is such I.G.C. available in South America (especially in > Brazil) or is there a way to obtain a copy of its design ? > > Thanking for your kind cooperation, > > Best Regards, > Ricardo Y. Tsukamoto, Ph.D. > Sao Paulo, Brazil Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links ------------------------ Yahoo! Groups Sponsor --------------------~--> Make a clean sweep of pop-up ads. Yahoo! Companion Toolbar. Now with Pop-Up Blocker. Get it for free! http://us.click.yahoo.com/L5YrjA/eSIIAA/yQLSAA/FGYolB/TM --------------------------------------------------------------------~-> Does your company feature in the microhydro business directory at http://microhydropower.net/directory ? If not, please register free of charge and be exposed to the microhydro community world wide! NOTE: The advertisements in this email are added by Yahoogroups who provides us with free email group services. The microhydro-group does not endorse products or support the advertisements in any way. More information on micro hydropower at http://microhydropower.net To unsubscribe: send empty message to [EMAIL PROTECTED] Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/microhydro/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
