Hello Hugh,
Yes you're right, that would be a very expensive solution if the MX60 was dedicated to the turbine. However we get so little sun while the wheel is producing, that I decided to simply combine the the two sources into the same MX60. When the sun returns, the wheel will go direct into the battery and the MX60 will perform a load dump function for the turbine and standard MPPT for the solar. As to efficiency, I know this setup to be much higher than the original setup (compound wound dc motor)but I do not have exact numbers. The toroid transformer on the charger as well as a 6 UF phase-shifting capacitor across the transformer's primaries added about 80-100 watts to the power delivered to the batteries. I suspect this means that I will indeed have to finetune the 1C-2C setup at some point. I bought everything, except the the MX60, as used or built it myself (including the main AC load dump) so the actual costs have not been overwhelming. Regards Rob Quoting Hugh <[EMAIL PROTECTED]>: > > > > > > > > > At 8:40 PM -0800 14/2/05, Rob Linschoten wrote: > > >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. > > > > This sounds very expensive?� What sort of efficiency are you getting, > > do you know? > > > > Many people also use the MX60 as a step down converter so as to get > > high line voltage (max 140V).� But this makes more sense for lower > > voltage batteries.� In your case it appears to be used purely for > > speed matching.� This could more cheaply be achieved by tweaking the > > C-2C capacitor sizes when you alter the flow (or for gross changes in > > battery voltage), if it seems worth it.� You can usually find a good > > all round value for the capacitance (and hence speed) to suit all > > flows and loads, if the pipe and wires are big enough. > > -- > > Hugh > > http://www.scoraigwind.co.uk/ > > > > > > > > > > > > > > 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 Sponsor > > > ADVERTISEMENT > > > document.write(''); > > > > > > > > > > > > > > > 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 the Yahoo! Terms of Service. > > > > > > > > > > > > ------------------------ Yahoo! Groups Sponsor --------------------~--> Has someone you know been affected by illness or disease? Network for Good is THE place to support health awareness efforts! http://us.click.yahoo.com/RzSHvD/UOnJAA/79vVAA/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/
