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shadowaxe356

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Posts: 2
Reply with quote  #1 
Hello, my Name is Tyler and I'm from Ohio. Well I’m saving up for a solar system, at fist I would like this to be a grid tie, then work in a battery back up down the road and I have the numbers for what my finished product will need. I will be mounting these in a side yard; I most likely will not need help with the mounting of the panels. The only question I have for that would be, is it true that I want to slant my panels according to my latitude and longitude? Also if I’m trying to run my whole house should I go 24V or 48V? I know the higher voltage allows for less resistance threw the wires but that’s about all I have on that information.
My Arrays will produce roughly 25,000w if my estimations are correct. I run about 3,000kw a month (There are many factors that go into this, I don’t own the house I’m in and I cannot make changes to anything that the house uses for sewage and the sub pump is only like 15gallons so it kicks on a lot. I also have a second family in this property, somewhat like a duplex) If I need 3,000kw = 3,000,000w that’s 100,000w a day for 30days, I live in Ohio so the average is 4.2 I like to round down on numbers like this so I went to 4 hours for 25,000w an hour. Are these calculations correct? I have worked with construction and rewiring (from breaker to rooms) in a few houses but I don’t know a lot about electricity. I would like to go with micro inverters but due to me having to get 125 panels (200w or 59 425w panel) it will get costly fast. My next question is can I have a pure sign wave inverter and have a few panels with micro inverters and just add on as I acquire more currency?
Now to my charger controller questions. I read that each controller takes so many amps. So I read that to get the amps that your running you need to use this formula (amps=watts/volts). So If I need a system for about 32kw (25kw x .25=6,250 + 25kw= 31,250kw) and I take that with a 24v system its 1,303Amps? (For 24V its 652Amps) Would the amps be the same for the Inverter as well?
Lastly I need to know where some people buy there equipment at, I have searched all over and I found some panels at a cheep price of .28/w and .48/w at http://sunelec.com/ there’s been some bad reviews of this place from the past but that was about 4 years ago and now they hold a A+ rating on another site I found. I would really like to get the panels for under $1/w if possible, or if there are any kits that will match my needs that would be great too. Thank you for all your time!

stmbtwle

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Posts: 2,860
Reply with quote  #2 
I think you just explained to yourself why higher voltage generally is better, for large systems at least. My PV array runs at 300+ volts.

For a system the size you propose, I think you need to consult a pro.

A 25000 watt array will have a larger footprint than most homes. Where are you going to put it, and what are you going to do with it should you decide to move?

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
shadowaxe356

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Posts: 2
Reply with quote  #3 
If i move ill sell the system and restart. Its going to be set up in the yard. Could you tell me if the math i have used is correct?
stmbtwle

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Reply with quote  #4 
Hope you have a big yard...

As far as I can tell your math is correct, but I am not qualified to advise on a system like that.  

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Solar is like the wind. It may be free, but putting it to work isn't!
Willie, Tampa Bay
gbwillson

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Reply with quote  #5 
On a system that big, powerful and complicated there are going to be some issues you may not have thought through. Even if you do all the work yourself, I would at the very least hire a professional solar installer or at least an experienced electrician for a consult. The power you are talking about is dangerous![eek][eek][eek] [eek]

Greg
netttech

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Posts: 720
Reply with quote  #6 
Shadow,

Have you checked with local (state) regulations? There may be a maximum KW output a resident can generate. Especially if you have any kind of grid-tie system. You may be forced to hire an licensed installer.

I checked into the regs a few years ago & there was a max of 10kw in my area. If you exceeded that level a different set of regs was imposed.

I've been told some of these limits may have been changed recently.

Before you buy anything, you should find out what regulations are in your area.

Jeff
Central IL
Solar air & water
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