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Evagoras

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Posts: 2
Reply with quote  #1 
I am from Cyprus and i need help to order the solar system parts from internet. I will stay in a prefabricated house and i want a small solar system to save energy in a battery to switch on two floretz lambs , one small fridge (for basic needs only) , one TV and for one pc. I know i need inverter but i don't know details/info to order them from web. 

Thank you in advance

---------------------------
Giving more info. The prefabricated house will have two fluorescent lamps, if i am right 100w each  set my company. I am going to buy a small fridge
and according the info i found from google it uses around 145W, speaking for a similar model.
I must note that i am living in Cyprus where is having 7-8 months sunshine.
I have found also that a desktop computer uses between 60 and 250 watts, depending on whether it is idle. A laptop consumes 15 to 45 watts (I have also a small labtop)

I am thinking to visit a solar company here in Cyprus , to ask their offer for such system and after.... to order the parts from internet [smile]
I will need just an electrician to establish the system.

stmbtwle

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Reply with quote  #2 
It takes a lot of power to run a fridge 24/7, and the batteries and solar panels aren't going to be cheap. Do you have to go solar or are you just trying to save money (you probably won't).

A 1000w inverter will run most fridges and should run a couple lights as well. What is the watt rating on the fridge and on the lights? You might go smaller but without that info it's just a guess.

The OUTPUT voltage of the inverter must match your line voltage, the input must match your batteries, probably 12 or 24v.
Full sine wave inverters are best, but I've had good luck with MSW inverters which are less expensive.

To run your fridge full time I'd want a minimum of 400 amp hours of batteries. You MIGHT get by with 200 and then again you might not. More is better, I use 6 golf cart batteries, 660 amp hrs @ 12v or about 7900 wh.


A fridge's daily consumption varies depending on room temperature and how much you open the door, but probably between 1000wh to 1500wh/day. Including the lights and you might be up to 2000wh/day.

To charge the batteries you'll need at least 700w of solar panels. More is better. You'll also need a charge controller for that wattage.

You can set all this up for 12v but 24v would be better. You have to decide BEFORE you choose an inverter.


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Willie, Tampa Bay
Rick H Parker

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Reply with quote  #3 
two fluorescent lamps , one small fridge (for basic needs only) , one TV and for one pc.

From experience, we know this can be difficult for some to do but, if you get the power requirements and work up a usage patterns for these, you would be off to a much better start them most people. The usage patterns do not need precise, any reasonable estimate would put you way ahead. 

For example Lamp one: 9 watts, Monday - Friday 5:00 am - 9:00am, 6:00pm -9:00pm . Saturday and Sunday 5:00am - 9:00 pm .



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

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Reply with quote  #4 
I have found also that a desktop computer uses between 60 and 250 watts, depending on whether it is idle. A laptop consumes 15 to 45 watts (I have also a small labtop)

Watts is power, a rate not a quantity. Batteries store energy which is a quantity not a rate.

All rates are Quantity/time to determine how much. One needs to factor out the time component in Quantity/time. To do that, the rate is multiplied by time.
Quantity/time * time = Quantity * time/time = Quantity * 1 = Quantity.


For example: 45 watt for one hour.
45W is 45 Joules of energy per second ... 45 Joules/s.

45 Joules/s for one hour
= 45 Joules/s * 3600 s = 45 Joules * 3600  * s/s = 162000 Joules * s/s = 162000 Joules * 1 = 162000 Joules of energy.

For convenience we express this in watt-hours instead of Joules.
45 Watt * 1 hour = 45 * 1 * Watt * hour = 45 watt * hour.  This is written as 45 watt-hour of energy.

45 Watts for 2 hours = 45 * 2 watt-hour = 90 watt-hour of energy.

two fluorescent lamps, if i am right 100w

A 100w watt fluorescent light would be as bright as a 430 watt incandescent bulb. More likely the lamps are 100W Equivalent, ~23 watts actual power. 



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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #5 
Evagoras, Can you get anything like a KILL-A-WATT there? It's a handy little meter that you plug into the wall and then plug the load into it. It will tell you what the load is at any given time, and it can also tell you your usage over time. It's by far the easiest way to meter something like a fridge. I don't know if they're available in 230v.

AHA!
https://www.ebay.com/itm/Digital-Volt-Voltage-Wattmeter-Power-Analyzer-Electronic-Power-Energy-Meter-Hot/282640476957?hash=item41ceaf6b1d:m:mymzSZ2C1JQARSjCoIl2ToA

Sure beats guessing.


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Willie, Tampa Bay
Evagoras

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Posts: 2
Reply with quote  #6 
Quote:
Originally Posted by stmbtwle
Evagoras, Can you get anything like a KILL-A-WATT there? It's a handy little meter that you plug into the wall and then plug the load into it. It will tell you what the load is at any given time, and it can also tell you your usage over time. It's by far the easiest way to meter something like a fridge. I don't know if they're available in 230v.

AHA!
https://www.ebay.com/itm/Digital-Volt-Voltage-Wattmeter-Power-Analyzer-Electronic-Power-Energy-Meter-Hot/282640476957?hash=item41ceaf6b1d:m:mymzSZ2C1JQARSjCoIl2ToA

Sure beats guessing.


I see you didn't understand that a fridge will work 24 hours per day and the lamps must be switched on at the night.
Rick H Parker

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Reply with quote  #7 
I see you didn't understand that a fridge will work 24 hours per day and the lamps must be switched on at the night.

A fridge cycles on and off as needed, it does not run 24 hours per day. The startup power can be as high as four times the running power.  Willie understands this well.

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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
stmbtwle

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Reply with quote  #8 
Evagoras,

If the meter does what I think it does, you can plug your fridge into it and let it go for 24 hrs (or a week) and it will keep a running total. A little math gives you the daily usage. My Kill-a-Watt works beautifully. You can do the same with the lights, computer, or even the entire cabin as long as you don't overload it.

You might be surprised at the numbers you get. Most appliances have the watts on the dataplate, but generally they use a lot less. Only a meter will tell you how much.

It's a VERY handy tool and well worth the cost.

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Willie, Tampa Bay
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