Rob:
Good for you, also I do suggest to use a current transformer to read the Power Factor for adjustment to improve the power generation. For the MX60,do you parallel both sources ( Solar and Hydro) if not, why not ?--like voltage ranges Can you detail your AC Load Ballast Regards Nando ----- Original Message ----- From: <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, February 15, 2005 1:10 PM Subject: Re: [microhydro] AC vs. DC microhydro > > > 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 ? 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