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klecroy

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Posts: 15
Reply with quote  #1 
What is the best way to light my garage ? I will get a solar  pannel,not sure what size,we are here 10 to 5 each day.
Should i use 12 vt bulbs ? Or 110vt with converter box ? Also local warehouse has a switch when you walk close to the light it turns light on,this will be ok as there dark spots when we would not be in that area .
I think 12 bulbs would do it ,now i have the 8' floresent .
                                                                        Thanks

stmbtwle

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Reply with quote  #2 
As you already have line-voltage lighting I'd keep that and just hook it up to a battery via an inverter. The solar panel (and charge controller) will keep the battery charged.

How big a panel depends on how much lighting you have (watts), and how much you use it (hours). Do the math. You have to get at least that much from your solar panels. Without knowing where you are we can't tell you how much to expect from a given size panel.




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Willie, Tampa Bay
klecroy

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Reply with quote  #3 
I tried using 12, 60watt led bulbs , and they did pretty good i am in Chattanooga Tn and my building faces south.Thanks for the repy
stmbtwle

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Reply with quote  #4 
Had me confused for a minute, but I think you meant "60watt equivalent" which is about 10w depending on brand. So 12 x 10w x 7 hrs = 840watt hours/day, or roughly 25kwh/month.

According to http://pvwatts.nrel.gov a 100w array mounted at 35° will get you 8 kwh/month (or more), so you'll need about 300-400w of panels. A pair of 200w panels should do it.

You probably won't need much in the way of batteries, but as panels that size are often 24v a pair of 12v deep cycle batteries in series may do it. If you get several days in a row of bad weather you may need more.

You can configure for 12v or 24v depending on wich is more cost effective. Do the math.

You'll also need a 24v 20-30amp controller, and a 24v, 1000 watt inverter or larger. (Or 12v if you decide to go that route).

If in doubt go bigger.

That's about the best I can do, others will help.

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Willie, Tampa Bay
Rick H Parker

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Reply with quote  #5 
I tried using 12, 60watt led bulbs

60watt equivalent. Somewhere on the package is the actual power consumption, typical 8 - 10 Watts  for a 60 watt Led equivalent. ... 100 - 120 watts total. Are they 120V or 12V lights?
Figure out what time of day and how long you need the lights on and post it here.






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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
klecroy

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Posts: 15
Reply with quote  #6 
I have some 60 watt 110vt that uses 9 watts.
I also have some 12vt that i could use , they need to burn 8 hrs daily from 10 to 5 pm,thanks
stmbtwle

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Reply with quote  #7 
Correction on inverter size, you don't need 1000 watts for just the lights. A 200 would do it unless you want to run something else with it. If in doubt, go bigger.
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Willie, Tampa Bay
klecroy

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Reply with quote  #8 
I believe i will try this for just lights now,as we have welders and such,i found a 300 watt pannel for $100 so this should do it,and thanks all for the help.
stmbtwle

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Reply with quote  #9 
Sounds like a plan. Please heep us posted!
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Willie, Tampa Bay
Rick H Parker

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Reply with quote  #10 
I have some 60 watt 110vt that uses 9 watts.

12 of these 8 hours per day 12 * 9 watts * 8 hours = 864 watt-hours of energy per day.

I also have some 12vt that i could use

Once again, actual power consumption and how many would you use?

from 10 Am to 5 pm

Daylight hours ... With the 300W panel, you would need about 300 - 350Ah of storage to carry over on poor production days in November - February.

This is what you can expect from the 300W panel at your location.

PV-Output.png


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Rick H Parker
Kansas, USA
Electronics Engineering Technologist
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