companies: Swell and Sunrun, one of the biggest costs is customer acquisition.
3 charges per week of car is 90kWh/week, 12/day
What is a 20 kWh system? Is that per day?
Lunar system Doesn't say how long battery lasts, what kind it is, or costs.
FZSoNick batteries
In general, 10 year guarantee (vs Tesla 25yr...)
Offered by https://unesrl.com/retrofit/ dunno if US/CA... 10yr guarantee
https://gridedge.com.au/ - Australia only, I think...
Innov energy 8 or 2x=16 kWh, Germany-only
Please fix it.
Case number: CO00D18328
More solar panels. Estimate: 15 panels, 5.2kW system, $8-$12k
We used 500 therms of natural gas last year, mainly on heating. This is 14,650 kWh. 88+396+610+172+413 Preliminary research Software embeddings of proteins are predictive of secondary structure variability. Old mac laptop - Mahdi Becaid - Benjy's advisor Other 14hours, this days - 2/3 completion in 6-8 so far, 3-4 Output - 60Gb output Then run a regression on it Incident with Lauren (roommate, smoking pot while baby at home) Anela and her sister got mad. A) Someone might report it- sister's in a custody dispute B) The idea that there's pot in the house?
See also: https://my.consumeraffairs.com/solar-companies/get-matched/ Apr 18, 2023
Prob this is best:
$1750 wi tax:
Jackery 1000 PRO
There is an "SMA inverter" that can detect a power outage and disconnect the home from the grid. This SMA inverter with Secure Power Supply has plugs so residents can draw up to 2,000 watts of power. This electricity is enough to charge phones, run some electronics or power a refrigerator using solar energy.
However, this grid-tied solar inverter provides electricity only during the day and has no energy storage capabilities. If snow covers the solar panels or there is cloudy weather, the inverter will supply less than 2,000 watts and no power at all at night. Although it doesn’t have all the same functionality as a battery energy storage system, it is usually far more economical to install.
This one at amazon takes 12v and outputs 2000
watts
see more
$377 This one has solar panels and recharges via solar in 3-4 hours
$219 This is w/o solar panels July 12, 2007
Solar City is ramping up business, getting lots of customers to help them bid down panel prices. With the Solar City discount, California's rebate and the $2k federal tax credit, we're saving about 40% of the cost, resulting in an investment that will produce a 12.6% ROI.
The system is made up of solar (photovoltaic) panels, mounting brackets, an inverter and the wiring and have Solar City install the system. (No batteries- they are costly. It's more efficient and economical to push extra power back onto the grid. Batteries are only valuable to avoid black-outs, which we experience less than a day per year, or to have power at night for homes not connected to the power grid.)
WHAT YOU'LL NEED:
My energy usage averages 527 kW (kilowatts). I submitted a letter with my solar application to justify a few more panels- I'll be converting the dryer to electricity, maybe hot water, too. And we'll be less stingy with A/C...
| Jan | Feb | Mar | Apr | May | Jun |
| 600 | 566 | 488 | 566 | 462 | 583 |
| Jul | Aug | Sep | Oct | Nov | Dec |
| 683 | 481 | 405 | 413 | 511 | 515 |
| Jan | Feb | Mar | Apr | May | Jun |
| 694 | 533 | ___ | ___ | ___ | ___ |
The cost/return:
| Cost: | $15,158 |
$25,385
- $6,730 rebate from the state - $1,496 solor panel discount since Solar City bought in bulk - $2,000 federal tax credit |
| Return: | $915 | The cost savings of the electricity produced in the first year. This is an estimate- the actual electricity is worth less, but homes tend to use it morning and night and PG&E pays more for electricity produced in the day. |
Assumptions:
To model this, say I put the $15,158 in a bank account and earn interest of X% and that bank account exactly covers the exact cost of the electricity that the panels produce in 25 years plus the $1500 needed to buy an inverter in 15 years. Since the bank account at X% interest has the same value as the electricity, then by putting that same money into buying the solar panels, the money is returning X% on the $15,158 investment.
In addition, I have to pay $1 for every $3 I make in a bank account, but nothing on the panels' electrical savings. So if a bank account would return $2 after taxes, it would have to earn $3 before taxes. So a return of X% on the panels is like a taxable investment returning 1.5 x X%.
I set this up as a spreadsheet, below. I filled out the 2nd and 6th columns, the cost savings and the principal, plus the extra $1,500 charge in the 15th year. Each year of cost savings is 1.05 times the previous year, and the simulated X% return is just the before-tax interest rate times the amount of principal left. Each Principal amount is the previous principal plus the money it would have earned in the bank (Return), minus the electricity cost, minus the expenses- as if the bank account were paying for the electricity.
Thus I found, if I put $15,155 in the bank at 8.44% interest, it would produce enough (untaxed) money to give me the same benefit as my solar installation, giving me a before-tax ROI of 8.44%. Assuming I have a 33.3% income tax (25% Fed and 9% Ca), this is a 12.66% after-tax ROI. Considering this is a very low-risk investment, that's great!
For comparison, I also made a spreadsheet for a principal of $23,381, for someone in a state with no subsidy but who can get the federal tax credit, and one for no subsidies, for a principal of $25,581. The before-tax ROIs were 4.7% and 4.06%, respectively. The after-tax ROI depends on your tax bracket. For a state with no income tax, a 25% federal tax means these are about 6.3 and 5.4 respectively- competitive with the best savings and CD rates currently available (about 5 to 5.5%) excellent for a low-risk investment helping save the planet.
Check back at the end of July, 2008 and I'll try to get numbers of how much we saved and how much rates have risen...
| Yr | Elec cost savings/yr | Before Tax Int Rate | After Tax Int Rate | Return | Principal | Expenses |
| 0 | $915 | 8.44% | $15,158 | |||
| 1 | $915 | 8.44% | 12.66% | $1,280 | $15,523 | |
| 2 | $961 | 8.44% | 12.66% | $1,311 | $15,873 | |
| 3 | $1,009 | 8.44% | 12.66% | $1,340 | $16,204 | |
| 4 | $1,059 | 8.44% | 12.66% | $1,368 | $16,513 | |
| 5 | $1,112 | 8.44% | 12.66% | $1,394 | $16,795 | |
| 6 | $1,168 | 8.44% | 12.66% | $1,418 | $17,045 | |
| 7 | $1,226 | 8.44% | 12.66% | $1,439 | $17,258 | |
| 8 | $1,287 | 8.44% | 12.66% | $1,457 | $17,427 | |
| 9 | $1,352 | 8.44% | 12.66% | $1,471 | $17,547 | |
| 10 | $1,419 | 8.44% | 12.66% | $1,481 | $17,609 | |
| 11 | $1,490 | 8.44% | 12.66% | $1,487 | $17,605 | |
| 12 | $1,565 | 8.44% | 12.66% | $1,486 | $17,527 | |
| 13 | $1,643 | 8.44% | 12.66% | $1,480 | $17,363 | |
| 14 | $1,725 | 8.44% | 12.66% | $1,466 | $17,104 | |
| 15 | $1,812 | 8.44% | 12.66% | $1,444 | $15,236 | $1,500 |
| 16 | $1,902 | 8.44% | 12.66% | $1,286 | $14,620 | |
| 17 | $1,997 | 8.44% | 12.66% | $1,234 | $13,857 | |
| 18 | $2,097 | 8.44% | 12.66% | $1,170 | $12,930 | |
| 19 | $2,202 | 8.44% | 12.66% | $1,092 | $11,820 | |
| 20 | $2,312 | 8.44% | 12.66% | $998 | $10,505 | |
| 21 | $2,428 | 8.44% | 12.66% | $887 | $8,965 | |
| 22 | $2,549 | 8.44% | 12.66% | $757 | $7,172 | |
| 23 | $2,677 | 8.44% | 12.66% | $606 | $5,101 | |
| 24 | $2,810 | 8.44% | 12.66% | $431 | $2,721 | |
| 25 | $2,951 | 8.44% | 12.66% | $230 | $0 |
PS: Current solar panels have reached about 24% efficiency, says this article. The next technology, organic polymers, promises to be cheaper, but they're currently only achieving 5% efficiency. I haven't seen any estimates, but they seem to me to be at least 3 years away and probably more like 5-10...
Another article, this one focusing on photovoltaics built into objects. Adding a coating to glass is reasonable, though some of the other ideas are pretty far out there, at least in years.