Solar cell
in [Design]
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From: Dirk Bruere at NeoPax on 18 Apr 2010 10:21 On 18/04/2010 08:02, eryer wrote: > On 17 Apr, 21:14, Don Lancaster<d...(a)tinaja.com> wrote: >> They also often fail to include the synchronous inverter costs, which in >> many situations will consume 150 percent of the value of ALL the >> electricity sent through iit. And not using a synchronous inverter, of >> course, is ridiculously more costly. > > Interesting...any link? > > About my first post, any suggestion? > Thanks This is like saying that PC power supplies will dissipate more power than the rest of the PC combined. If you want to see where the market is going on converters, look to the PC PSU market and costs for a mature and very similar example ie 5c a Watt and 80%+ efficiency -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.blogtalkradio.com/onetribe - Occult Talk Show
From: Paul Keinanen on 18 Apr 2010 10:27 On Sun, 18 Apr 2010 16:43:51 +0300, Paul Keinanen <keinanen(a)sci.fi> wrote: > >The US is not in the tropics, so as an annual average at noon, perhaps >7.2 TW could be produced. Due to air mass losses at low solar angles, >at most 10 h/day would produce the nominal power, dropping the daily >average to 3 TW. Omitting any cloudy days (concentrating power does >not work when it is cloudy), still that claim sounds reasonable. OOPS, this calculation is a bit too optimistic with abot 30 %. While the power reflected from a heliostat can be made to reflect nearly a constant power between 08:00-16:00 local time, in a heliostat park, the heliostats can not be mounted side by side particularity in the east-west direction, since in the morning and evening, they would shadow each other. Thus some space must be left between the heliostats, reducing the effective capture area during noon. So in practice, the effective collection area can calculated using the projection. i.e. multiplying the zenit power level with the cosine with the zenit angle. Even then, the capture area is still somewhat less, since the heliostats mounted at fixed locations can not reflect all sunlight falling in the area and some of the light will hit the ground.
From: Don Lancaster on 18 Apr 2010 11:31 On 4/18/2010 7:21 AM, Dirk Bruere at NeoPax wrote: > On 18/04/2010 08:02, eryer wrote: >> On 17 Apr, 21:14, Don Lancaster<d...(a)tinaja.com> wrote: >>> They also often fail to include the synchronous inverter costs, which in >>> many situations will consume 150 percent of the value of ALL the >>> electricity sent through iit. And not using a synchronous inverter, of >>> course, is ridiculously more costly. >> >> Interesting...any link? >> >> About my first post, any suggestion? >> Thanks > > This is like saying that PC power supplies will dissipate more power > than the rest of the PC combined. If you want to see where the market is > going on converters, look to the PC PSU market and costs for a mature > and very similar example ie 5c a Watt and 80%+ efficiency > If a naive homeowner tries to buy a synchronous inverter for a 1500 watt system, its typical retail cost (plus shipping and installation, of course) will be around $2500. It thus gobbles gone all pv electricity sent through it and then some. There is no reason the $2500 device should cost more than $9. Except for subsidies. -- Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don(a)tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com
From: Dirk Bruere at NeoPax on 18 Apr 2010 11:41 On 18/04/2010 16:31, Don Lancaster wrote: > On 4/18/2010 7:21 AM, Dirk Bruere at NeoPax wrote: >> On 18/04/2010 08:02, eryer wrote: >>> On 17 Apr, 21:14, Don Lancaster<d...(a)tinaja.com> wrote: >>>> They also often fail to include the synchronous inverter costs, >>>> which in >>>> many situations will consume 150 percent of the value of ALL the >>>> electricity sent through iit. And not using a synchronous inverter, of >>>> course, is ridiculously more costly. >>> >>> Interesting...any link? >>> >>> About my first post, any suggestion? >>> Thanks >> >> This is like saying that PC power supplies will dissipate more power >> than the rest of the PC combined. If you want to see where the market is >> going on converters, look to the PC PSU market and costs for a mature >> and very similar example ie 5c a Watt and 80%+ efficiency >> > > > If a naive homeowner tries to buy a synchronous inverter for a 1500 watt > system, its typical retail cost (plus shipping and installation, of > course) will be around $2500. > > It thus gobbles gone all pv electricity sent through it and then some. > > There is no reason the $2500 device should cost more than $9. > Except for subsidies. Actually, there is. Charging what the market will stand. Consumer ignorance Solar Tech is an immature technology, by a long way. I was looking at a solar water heater (not PV) a couple of years ago. The installed cost from most companies in the UK was around �1500. My estimate of the manufacturing cost plus installation was about �300. Most of which goes to the plumber. The cost of synchronous converters will drop like a stone when they are being sold in the tens of millions through DIY stores. -- Dirk http://www.transcendence.me.uk/ - Transcendence UK http://www.blogtalkradio.com/onetribe - Occult Talk Show
From: Don Lancaster on 18 Apr 2010 11:49
On 4/18/2010 3:20 AM, Paul Keinanen wrote: > > In any switchers with bipolar components, at least one junction > voltage drop is lost in switch Vce voltage drops... Not so with synchronous rectifiers. -- Many thanks, Don Lancaster voice phone: (928)428-4073 Synergetics 3860 West First Street Box 809 Thatcher, AZ 85552 rss: http://www.tinaja.com/whtnu.xml email: don(a)tinaja.com Please visit my GURU's LAIR web site at http://www.tinaja.com |