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Originally Posted by J D Sauser
So "georgios"... you have my undivided attention. Is there anything new you'd like to share?
I especially like your idea of storing energy mechanically (versus batteries). I have been calculating a system using two water reservoirs... one on ground or under ground and one at altitude and use the gravity of the water pumped up at times of high energy production to produce energy at times of no wind. Needless to say that we'd be looking at huge masses of water and/or hights. thus I'd love to hear more about your idea of compressing and decompressing a gaz.
I think that a home with no grid hook up should be able to be serviced by 5 kW/h at any time and for an unrestricted time period to make the system appealing not just to limited aplications... keep in mind this is an AC region.
... J-D.
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Hola J D Sauser,
The BATTERY STORAGE SYSTEM is well known and practiced world wide. Here
are the "specs" ;
1. Initial purchase cost - relatively moderate.
2. Maintenance - High if flooded type is used.
3. Maintenance - low if sealed type, AGM batteries are the best.
4. Quality - varies on type and make.
5. Performance - depends on AH capacity-large battery bank is best.
6. Replacement - number of years vs type - AGM type = 10-15 years.(best)
7. Misc - toxic gas emmisions, leaks and disposal problems.
8. System elect power losses approx 30% at best.
The WATER STORAGE SYSTEM is found in a handful of locations in the
world. This type of storing kinetic energy does not refer to existing water
dams. Simply, any excess power produced can be stored by pumping
water at a higher reservoir. The "head" created provides gravity force thru
a penstock pipeline to feed a water turbine at the bottom. The asynchronous
generator delivers its rated power at 1800 rpm. The losses of this system
are 30-35%. The cost can vary as many factors affect it. Generally, it is
a high cost solution but once built it will power the load(house, factory etc)
without the need of batteries or inverter. The power output is pure sine wave
with a harmonic distortion below 4%. All the components are off the shelf
items - nothing special about it. Here is the specs of power vs water;
SMALL TURBINE MEDIUM TURBINE LARGE TURBINE
Discharge 0.1 - 0.3 cubm/sec 0.1 - 1.4 cubm/sec 1.0 - 3.5 cubm/s
Head 2 -15 meters 2 - 15 meters 2 - 15 meters
Power 5 - 25 KW 5 - 100 KW 10 - 200 KW
Legend.
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cubm/sec means cubic meters per second. Above quantities appear at first
to be large but really are not.
The COMPRESSED AIR STORAGE is widely used for industrial application only.
There is nothing available as an "off the shelf" system. I am working on this
with limited success so far. The main drawback is sourcing a high pressure
compressor to achieve 1550 psi at a reasonable cost. The remaining parts
of the system are easily found all over the world. Losses are projected at
30%. Again, this system eliminates the need for batteries & inverter. High
quality power is typically the final output.
The good news is that in a couple of months my website will be posted
on DR1 for the first residential - commercial wind turbines available for
sale. I can not disclose any more info about this untill a paid DR1 banner
is posted.
Thanks for your reply,
Georgios.