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Practice scenario, with flow chart.

posted Mar 09, 2012 17:35:27 by huntxtrm
I am going to start a practice scenario with flow chart thread. We will start this one with a grid tied system. 2000kwh a month avg usage, lets offset by 50%. assume the roof space is there. I will start design, and diagram. You all can redline and critique at will. Maybe we will all learn from it. I know i have trouble remembering what to calculate first, and then what. Almost forgot #SolarMOOC
[Last edited Mar 09, 2012 17:36:03]
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15 replies
huntxtrm said Mar 09, 2012 18:05:21
Ok, here we go. I am basing on Fort Worth, I am going to try and attach the data sheet for Solar radiation and temps.
1) 2000kwh average usage/50%=1000kwh production per month.
2) 1000kwh per month production/30.4 Days in a month=32.89 KWH production per day
3) 32.89 KWH per day production/5.4 sun hours per day=6.09kw production A/C.
So this flow chart will start with items 1,2,3 and carry on from there, as we design.

I would like to use a SMA SB6000US? any objections? Designing D/C to match the inverter. I will also attach data sheet for it. Well, i will need some help attaching. anybody know how i can attach pdf?
huntxtrm said Mar 09, 2012 18:12:44

huntxtrm said Mar 09, 2012 18:15:54

huntxtrm said Mar 09, 2012 18:16:50
Wow, I got it. Had to convert to jpg first. oh well this way you can mark it up in photoshop.
huntxtrm said Mar 09, 2012 18:18:23
WEll thats not very good, can somebody tell me how to upload a pdf? it would probably work better.
VictoriaKogan said Mar 10, 2012 03:28:23
Not sure how to upload or embed a PDF, but I grabbed the Sunny Boy data sheet from the SMA website and put it on my blog, should be much easier to read!

Sunny Boy 6000-US Data Sheet

Where did you get the solar radiation table?
Victoria Kogan
VictoriaKogan said Mar 10, 2012 05:49:41
I found a PDF of Fort Worth solar radiation and included it on the same link:
Victoria Kogan
huntxtrm said Mar 10, 2012 13:36:44
i have a compresed file that has all the states solar radiation and temp data. If anybody is interested in it, i could possibly email it. if its not to large?
SarahRaymer1 said Mar 10, 2012 23:55:57

You can get download the free program online called "JING" which allows you to 'screen capture' images and video from the web. You can capture the image, save it, and then upload it here. I am attempting to do this right here by inserting my latest blog post from Let's see if it works...
SarahRaymer1 said Mar 10, 2012 23:57:15
looks like it cut the edge off from my end. hmmmm. It's still worth try.
SarahRaymer1 said Mar 11, 2012 00:04:24
If you can't see the whole image you should be able to click on it get a full
huntxtrm said Mar 11, 2012 14:38:39
I will look that up. I use the snip tool, it did'nt come out to clear. I am going to work out the drawing today, of the system proposed. I will include the specifics. Then we can walk down the drawing and calc array outputs, wire sizes, fuse sizes, ect....... and start on this flow chart. I invite all to add whatever they want, i would like to include every possible scenario for a grid tied system. Thanks
huntxtrm said Mar 12, 2012 15:09:54
Ok, here is the drawing. Feel free to add, or tell me to add anything you think should be on there. Lets pick this thing apart, in an orderly fashion. I will get a list of steps start to finish, with the references going. As we pick it apart.Hopefully this works?
huntxtrm said Mar 12, 2012 15:11:30
Hopefully one of these will work. i used the jing tool, seems to work well, so far.
SarahRaymer1 said Mar 21, 2012 19:30:30
The font is really hard to read on these. Does the run from the DC disconnect to the "safety switch' say 13, 15, or 18 feet? Safety switch is outside by the motor- what does that mean? In this diagram it seems the DC disconnect is part of the inverter- correct? I think you have to have another DC disconnect that is obvious and clearly marked for the firemen or linemen to see- one with a pull handle so they can switch the system off without fooling with the inverter or assuming it turned itself off.

20' of conduit 3"above roof, with 4 current carrying conductors
175' after it comes off the roof before it hits the inverter- 4 in conduit again
xx?' DC disc. to safety switch (AC disconnect?)
15" from safety switch to MDP

Am I reading the numbers right?
Have you got any farther on this? It would be a good exercise to get through.

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