Hybrid Car – More Fun with Less Gas

What are some payback times for systems currently installed? - Page 7

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Posted by danny burstein on December 19, 2011, 8:46 am
 


Looks like you misplaced a decimal point:

1000 watts/1,000 => 1 kw; 4000/1,000 => 4 kw. Now times 4 hrs -> 4 kw-hr/day

4 kw times 0.10 dollars =>0.40 or 40 cents/day

40 cents times 365 => 14600 cents. Divide by 100 => $ 146.00

(if 11 cents per kw-hr [erlier poster mixed both terms],
 you'd see $ 160.60)


[material underneath left for reference]





basic

price...say

panels.

factors,

next

looking

books.

_____________________________________________________
Knowledge may be power, but communications is the key
             dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]

Posted by Mho on December 19, 2011, 5:53 pm
 
We all need to go to math school. Yes I stated the power in watts and the
rate in kiloWatthours.

Some assumption of math skills was asserted. The other basic math changes
were injected by the hecklers...LOL

There are three kinds of people in this world. Those that can do math and
those that can't!

----------

writes:


Looks like you misplaced a decimal point:

1000 watts/1,000 => 1 kw; 4000/1,000 => 4 kw. Now times 4 hrs -> 4 kw-hr/day

4 kw times 0.10 dollars =>0.40 or 40 cents/day

40 cents times 365 => 14600 cents. Divide by 100 => $ 146.00

(if 11 cents per kw-hr [erlier poster mixed both terms],
you'd see $ 160.60)


[material underneath left for reference]





_____________________________________________________
Knowledge may be power, but communications is the key
     dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]


Posted by argusy on December 20, 2011, 11:10 am
 On 20/12/11 4:23 AM, Mho wrote:

<snip>

I like your mathematics!!.

Obviously, I'm in the "those who can't" class.
Like in an earlier post -

Der, graham

.11 is ALREADY in dollars - I just couldn't see it for a while.
so I multiplied by a thousand, then divided by a hundred.

That's a factor of 10. No wonder I got $606.

I humbly apologise for calling myself "a moron".

Oh, well, it's about time I started using a calculator, anyway.

Just as a matter of interest, I'm now on my third inverter.

The first one died about three weeks after the installation.
The second one died about four weeks ago.
The third is still working, but the brand has me worried.
(Sunnyroo 3000TL - made in China, rebadged as "assembled in Australia")

At least they were under warranty.

Graham






Posted by Mho on December 21, 2011, 3:57 am
 Ouch! No malice. Crapola happens all the time on Usenet. Pay attention to it
and no tech talk happens.

I have been working on the same junkyard unit since the beginning of my PV
career and hoping it doesn't die at anytime. I do not know what I will do if
it does! I provides a MPPT battery charger, co-gen and secure power supply
for some circuits in my house. I am not sure what I will do if it goes bad.
The unit was a known fire hazard at 5kW and they derated it in software to
3kW but still with a 10kW peak capacity for 1 minute (really good rating)
just before they went bankrupt or sold out to another company that won't
support it anymore due to new model sales. The interrogation software has
features which are not documented. The battery charger do not appear to
support many of the modes available in the software..etc.. Luckily a nice
tech there shipped me a new EPROM which didn't need to be reset each
morning. I need to get into the thing to clean relay contacts sometime but
after retiring from that crap (35 years)  just can't bring myself to do it.
If I ever replace the computer their algorithm is available. maybe, if I beg
really well, on the phone to crack the migrated software installation. The
nice tech left the company.

On the math front I used to be so good at basic arithmetic and now it screws
me up big time. As my own home builder more mistakes have been made due to
my arrogance knowing what arithmetic results are in my head. I am out of
practice, big time. More lumber has been ruined by that arrogance. Damn
father used to drill me when I was 4-5 years old!...LOL  Now I use a
calculator, a lot!

--------------

Obviously, I'm in the "those who can't" class.
Like in an earlier post -

Der, graham

.11 is ALREADY in dollars - I just couldn't see it for a while.
so I multiplied by a thousand, then divided by a hundred.

That's a factor of 10. No wonder I got $606.

I humbly apologise for calling myself "a moron".

Oh, well, it's about time I started using a calculator, anyway.

Just as a matter of interest, I'm now on my third inverter.

The first one died about three weeks after the installation.
The second one died about four weeks ago.
The third is still working, but the brand has me worried.
(Sunnyroo 3000TL - made in China, rebadged as "assembled in Australia")

At least they were under warranty.

Graham






Posted by argusy on December 21, 2011, 10:32 am
 <snip>

not as bad as having your mother teaching at the same school.

I could never get away with saying "Nah, Mum, no homework tonight", knowing damn
well she'd already asked my teacher what I've got.

She'd drill me, too, on maths, English and whatever else she found out what my
teacher had taught on the day.

I was always top of the class with 90% plus, and it STILL wasn't enough!!

I joined the RAAF (apprentice) when I was 15. <grin>

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