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Old 08-10-2009, 01:36 PM   #16
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Originally Posted by mboxwell View Post
Not really... you store the power in a battery and use it when you need it. That way your battery can charge up during the day and you can use the power whenever you want it.

It also means that you can have a smaller panel than you'd need for instant power without a battery, because the solar panel would be trickle charging the batteries every day.
And how big of a battery array would be needed to power a fridge?

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Old 08-10-2009, 04:42 PM   #17
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And how big of a battery array would be needed to power a fridge?
http://www.wholesalesolar.com/pdf.fo...ower-table.pdf
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Old 08-10-2009, 05:57 PM   #18
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And how big of a battery array would be needed to power a fridge?

I was looking at this beast before. PowerHub 1800. You can hook it up to your grid, and/or solar panels AND/OR wind, kinda like a UPS system. Looks pretty pricey, but i did see one on closeout locally for $350 (that doesn't include batteries).

The manual said you can run upto 1800 w of power, which should be enough for a fridge plus lights, with 1 or 2 100ah batteries.

It got a single review on Northern (or maybe Amazon) that wasn't too flattering, but i couldn't find any other info about it anywhere. Looks interesting though...
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Old 08-10-2009, 06:23 PM   #19
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Hell! That's a big price for an inverter

And that is just the inverter. It doesn't include solar panels, batteries, charge controllers or anything else. You'd end up spending $4,000 plus on a basic system just to power a fridge

If all you wanted was a solar powered fridge and some lighting, you'd be better off getting a 70 watt solar panel, a charge controller, 140 amphours of traction batteries, some high output 12v lighting and a Steca Solar Fridge (they run on 12v or 24v, so you don't need the inverter).

Shop around to get the right price and its job done for around $1,500. Still want to spend $900 on just an inverter?

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Old 08-10-2009, 06:29 PM   #20
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So I'm spending $1500 to buy & power a 12v fridge?
Makes running electric a whole lot cheaper
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Old 08-10-2009, 07:01 PM   #21
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no, this would not be used in the shed! the fridge conversation made me think of it

i was thinking that because it is an inverter and transfer switch, it would be an option for using in the house. the only reason i was even considering this was the local sale price of $350

sorry for confusion
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Old 08-15-2009, 02:23 PM   #22
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I am planning a full set up ,one reason is I have money today,might not have money 3 to 5 years from now or a job.......I am looking into reducing my monthly bills to as close to 0 as possible.

With the 30 percent tax break the pay off is under 10 years now in most areas....especially california where if you use over a certain amount of electricity the rate almost doubles.

What happens in storms.....the power goes out,what happens during a brown out......what happens during a natural of man made disaster.....what happens when they decide to charge you double what you are paying now for electricity.What happens when you loose your job and have only enuff money to eat.....what happens when you retire and have very little income or completely loose your retirement like seems to be happening to alot of people.What happens if you get sick and cant work or have hundreds or thousands in hospital bills to pay or you get crippled at work or on the way to church.........

There is alot more to solar and wind power than just trying to save money and get a free ride or even cleaning up the planet.

I plan on retiring early,very early,i already have over 5 acres paid in full and now one of the last money suckers to get rid of is the monthly utilities.
No rent or house payment and no utilities to pay,my own well water and growin/raising alot of my own food.....how much a month would you have left in your pocket if you could eleminate those bills and how much a month would it cost to live then...........very little

A solor or wind system might take 10 or 15 years to break even on ,but in 10 or 15 years you will still be paying bills ,I am going to put the cash out now while i have it and will not be paying bills for that 10 or 15 years and then when it is to break even stage its a free ride..possibly a money generating deal then selling power to the utilities.

Everything is a trade off I just like the benifits of making my own power.....money and space may limit some as to thier options...it just happens to be a good option for me currently.
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Old 08-15-2009, 02:33 PM   #23
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I have money today,might not have money 3 to 5 years from now or a job

reducing my monthly bills to as close to 0 as possible.

what happens when they decide to charge you double what you are paying now for electricity.
What happens when you loose your job and have only enuff money to eat.....
what happens when you retire and have very little income or completely loose your retirement like seems to be happening to alot of people.
What happens if you get sick and cant work or have hundreds or thousands in hospital bills to pay or you get crippled at work or on the way to church.........

the last money suckers to get rid of is the monthly utilities.

No rent or house payment and no utilities to pay,my own well water and growin/raising alot of my own food.....how much a month would you have left in your pocket if you could eleminate those bills and how much a month would it cost to live then...........very little

A solor or wind system might take 10 or 15 years to break even on ,but in 10 or 15 years you will still be paying bills ,I am going to put the cash out now while i have it and will not be paying bills for that 10 or 15 years and then when it is to break even stage its a free ride..possibly a money generating deal then selling power to the utilities.

Everything is a trade off
In that case you need to know the formula
http://en.wikipedia.org/wiki/Present_value
and the idea of
http://en.wikipedia.org/wiki/Opportunity_cost

Estimating the likelihoods of those bad things happening wouldn't hurt, either. . .

Causes of death in the US (330,000,000 people)

1000/day from smoking
250/day from hospitals
160/day from guns
110/day die on the highways
14/day from food poisoning
4/day from electrocutions

170/yr from CO poisoning
55/yr from lightning

1 injury in 50 yrs from a meterorite

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Old 08-18-2009, 04:42 PM   #24
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Iam new to this site and need some basic solar panel help is there anyone willing to help with a newbee
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Old 08-18-2009, 05:01 PM   #25
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Iam new to this site and need some basic solar panel help is there anyone willing to help with a newbee
perhaps you should tell us what your problem is first!!

My guess is you will get more help than you bargined for.
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Old 08-18-2009, 09:38 PM   #26
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OK as i have said Iam new to this solar thing and try to get a grasp of what is going on. So with that said.I have got two Telefunk panels that in full sun I get 19.48 DCV these are small panels 2foot X 10 inches how do I figure the watts? Next I got a pro sine 1000 inverter and a 15amp charge controller feeding three 120ah deep cycle batterys.Now when I hook the panels in series the DCV stay the same but does that speed up the charging time?Or should I be hooking parell? Oh I might say this is a 12 volt system (batterys all hooked pos to pos and neg to neg) At this point all I want is to run back up lights (15 watt florsent)x7 at most when the lights go out and to keep the batterys toped off.Is this all going to work out? Thanks Alan
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Old 08-19-2009, 05:28 PM   #27
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I have got two Telefunk panels that in full sun I get 19.48 DCV these are small panels 2foot X 10 inches how do I figure the watts?
Watts = Volts x Amps. Based on nothing but the size, I would guess these are 10-20 watt panels. Is there a model number printed on it anywhere?

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Now when I hook the panels in series the DCV stay the same but does that speed up the charging time?Or should I be hooking parell?
if you hook them in series you will get higher voltage, so it sounds like you want to hook them in Parallel so you get more current ( 12vdc batteries charge faster) and not double your voltage and risk damaging your 12v batteries

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Old 08-20-2009, 08:14 AM   #28
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no there is no modle number on these panels.All that I know for sure is that they are stainless steal and came from a sail boat they have a red and blue wire of the back and that is all that I know for sure I have tryed to resherch these and cant find anything about them.

Now to hook these up right you are saying I need to go from -to + at the panel and then to the charge controller +to+ and -to-?

I want to thank you for your help. Alan
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Old 08-20-2009, 08:21 AM   #29
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Oh I have done a dry run and when I hook the panels together eather way the DCV on my meter stays the same.So I checked each panel and they are both giving a good reading.Now Iam lost for sure
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Old 08-20-2009, 04:31 PM   #30
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Quote:
Originally Posted by atopi View Post
how do I figure the watts?
For max. power transfer the internal resistance of the panel must equal the load resistance.

Look at
Equivalent circuit of a solar cell

in http://en.wikipedia.org/wiki/Solar_cell

The internal resistance of this circuit changes with several different things so I'd look to see whether anyone makes an inverter that maximizes power draw from solar panels.

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