Welcome to the Solar Collector
Brainstorming and Development Page!


 

Home

Hot Air Collector

Hot Water Project 1

Hot Water & Space Heating

Solar Electric

Solar Construction 101

FAQs

Best Collectors

Simply Solar
Register Calendar Latest Topics
 
 
 


Reply
  Author   Comment   Page 2 of 4      Prev   1   2   3   4   Next
mvas

Registered:
Posts: 9
Reply with quote  #11 
Change everything to LED Bulbs and start saving money.
Solar is still too expensive, you cannot generate Solar Power cheaper than buying Grid 110V AC.
Buying Solar Panels and an Inverter will cost you money.


stmbtwle

Avatar / Picture

Registered:
Posts: 2,474
Reply with quote  #12 
Pretty!
__________________
Willie, Tampa Bay
Rick H Parker

Avatar / Picture

Registered:
Posts: 651
Reply with quote  #13 
Solar is still too expensive, you cannot generate Solar Power cheaper than buying Grid 110V AC.

"Today the average cost of energy from solar PV in U.S. is reported to be 12.2 cents per kWh, which is about the same as the average retail rate. Mar 31, 2016"

This is based on installed cost of $3.05/watt. DIY cost is below that.

Source

Rick H Parker




__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
mvas

Registered:
Posts: 9
Reply with quote  #14 
That report is not applicable to this thread.
That report is about a large scale system, with economies of scale.
In your haste to try to prove me wrong, you did not stop to think if that report is applicable or not.
It is not.

This thread is about a very small scale LED lighting system.
The amount of energy this system will consume is very small, but the PV costs will be large.
Making payback = 20 years or more.

So, what happens when a cloud passes overhead or it is raining, then the Garage goes dark?
What about the PRICE for Deep Cycle Batteries, they need replaced every 3 - 5 years.
I do not believe the PV Charge Controller will last 20 years.
I do not believe the DC-to-AC Inverter will last 20 years.
I have very little electronics that is still functioning after 20 years.
Solar Panel production degrade about 1% every year.

Look around your house, is the average age of your electronic devices = 20 years?  NO.
But wait, these PV Inverters, PV Charge Controllers and Deep Cycle Batteries will last 20 years?
Simply unrealistic.

Even if this is DIY it must installed per the National Electric Code.
Typically, you need to pull a permit and get an inspection when you attach any PV Panels to your roof or bring the PV Wires inside the house.

The COST to run LED's from PV Panels with a battery back-up is simply not cost effective.

There is a time and place for PV ... this is neither the time, nor the place.
stmbtwle

Avatar / Picture

Registered:
Posts: 2,474
Reply with quote  #15 
Hate to admit it but mvas may be right. Do the math.
__________________
Willie, Tampa Bay
Rick H Parker

Avatar / Picture

Registered:
Posts: 651
Reply with quote  #16 
That report is not applicable to this thread.

It is applicable to your statement and is correct. One can generate electrical energy at cost less then the grid.

Your attempt to divert by means of ad hominem works on some but not all.


Your claims are all based on unsubstantiated beliefs, not science, not economics, not math and not rational analysis.

__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Rick H Parker

Avatar / Picture

Registered:
Posts: 651
Reply with quote  #17 
Hate to admit it but mvas may be right. Do the math.

It is your position you do the math.

__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

Avatar / Picture

Registered:
Posts: 2,474
Reply with quote  #18 
I did. For a small installation with batteries, I think he's right.
The article as far as I can see does not address storage or back up generation (which still comes from the utility). Batteries are a BIG part of a stand-alone system.

Kleroy bought a 300w panel for $100, he still needs batteries (more later) and associated hardware (~$100). I don't THINK the one panel will be enough in the winter so I'm adding another $100 for a second one. Then there's installation. Say he gets away for $400, installed less batteries. Let's say this home brew setup does last 20 years, that's $20/ year.

The batteries will have to be replaced every 5 years or so, so $800 total for batteries. We're up to $1200 or $60/year.

Assuming his lighting system if on grid would use 1kwh/day, that's 365kwh/year, or $55 at 15c/kwh.

Grid is still cheaper. $55 vs $60.

The fly in the ointment is those darn batteries.


Then consider the economy of scale. If I can buy a panel retail for $1/watt, what do you think the utility can get them for when they order 200,000 at a pop? http://www.tampaelectric.com/company/ourpowersystem/powergeneration/bigbendsolar/


__________________
Willie, Tampa Bay
mvas

Registered:
Posts: 9
Reply with quote  #19 
Off-grid AC power is way too expensive for any LED Lighting system.
Replacing the expensive AGM battery every 4 - 5 years kills any potential for a "break even" - ever.
So, what is the point of installing LED lights - to save money
With a battery based system, there are no savings.

The irrelevant news article that was posted, was for a large Grid-Tie system.
The OP cannot generate AC power, for his Garage LED Project, cheaper than just buying Grid Power.
And if you think he can, then you need to post the bill of materials, add it up and compare to the total energy costs of his LED's

This thread is about the OP's LED project - not some theoretical (off-topic) project.
This thread is about the OP's costs - which will exceed any energy savings = bad investment.
This thread is about the OP's payback - which is never.
It is just cruel to mislead the OP into thinking he can generate Off-Grid AC Power, cheaper than Grid Power.
Is this thread about SAVING the OP money ( me ) or about spending more of his money ( you ) ?

If you want to discuss your theoretical (off-topic) Grid-Tie system in another thread, we can do that too.

Rick H Parker

Avatar / Picture

Registered:
Posts: 651
Reply with quote  #20 
The batteries will have to be replaced every 5 years or so, so $800 total for batteries. We're up to $1200 or $60/year.

I ran the numbers, two Trojan T-105 is all that he needs. $300 for batteries. His mean state of charge would be about 90%, one would expect a long life .. 8-10 years.

__________________
Rick H Parker
Kansas, USA
Electronics Engineering Technologist
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Easily create a Forum Website with Website Toolbox.

 

web statistics