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The installer commissioned my solar system tonight. He also mention that this particular Solaredge model SE-7600-Us will work with battery backup or off grid. This to know for future modifications. He said not all of Solaredge models will do this.

Thanks again IRstuff-It's part of the 20 year warrantee that the installer monitors my inverter. His site allow a lot of information to be displayed to me thought the internet. he uses some type of wireless monitor that is connected hard wire to my internet router. I have it installed as an app...

Thank you all for your time, help, great comments and suggestions in solving this problem.http://files.engineering.com/getfile.aspx?folder=d05c4b23-ad6a-4e26-bd3e-ec35ca0bc7a9&file=IMG_20171011_111129317.jpg

First -I was with the electrician when he recorded the 247 VDC . Saw the same value he did. T told him shouldn't it be about 370 VDC. He said no it was common to read lower voltages. I was not experience with this entire set up so I decided to check around that's how this wound up in this forum...

photo of meter readinghttp://files.engineering.com/getfile.aspx?folder=5656367a-8f52-4255-8755-723e01e9095a&file=IMG_20171010_165159174.jpg

Okay the power company came and put in their meters. The time is 4 PM it gets dark about 6:30 pm. I fired up the inverter and amazingly the DC voltage is at 370 VDC at 245 watts (370 VDC is the correct value per Mfg.). So everything is okay when the sun is setting. Tomorrow I will check a full...

Doesn't make sense. I think some how the solar power cycle lost is not that much during the entire year.

IRstuff- I agree-I did a comparison calc using solar power software- the yearly KWH results were almost the same using a larger inverter.

irstuff-looks like my inverter except yours is about a 3kw output maybe model SE3000A-US-there is a label on the right side with the model number and other data. nice system it looks like it is working fine. you are right The peak power of the solar panels is 8.4 kw the dc side. the inverter...

reference Itsmoked and waross-I am thinking the same thing. I am waiting for the inverter to be powered up. There is a button on the inverter that can be pressed to read the display Vdc, Vac and Pac (power ac in kw's).I also will verify dc amps and dc voltage with multifunction dc clamp on meter...

Yes there are solar inverter's that are designed for that called grid tie-battery backup. It also requires specialize switches. inverters are very specialized pieces of equipment. first they must be able to frequency syn to your inverter to the utility system. the inverter must convert dc to...

The Grid tie solar system a house was design to be overdriven for maximum continuous solar power during daylight cycle. The utility is 120/240 VAC single phase system 200 amp service. It has a 76kw SE7600-US Solaredge inverter with 28 Solaredge P320 power optimizers mounted externally on the...

I would suggest contacting the a person that has a free load flow program called Elplex and ask him http://pp.kpnet.fi/ijl/ I think it is written by Jorge Cordenas of Finland.

A good starting point would be to check outhttp://www.nmsu.edu/~tdi/pdf-resources/cc94.pdf for a basic design. Another is http://www.solarpowerworldonline.com/2014/09/new-nec-codes-will-affect-installations-2/ Aee Solar Renewable Energy Design Guide and catalog...

Why can't use the larger motor and see if that works. Sometime the practical solutions are the best.

Check with the motor manufacture if this is okay.

Contact your local building department plans check with this question.

I would use the study guides recommended by National Association of Professional Engineers . The secret is to take three weeks off from your job. Just study 8 hours a day, five days a week and don't study the day before the test. This should clear your head of work related data in your memory...

It depends- if the 480 v is connected delta and floating which is typical of these old systems. it is designed that way in the old days in case one phase of a motors grounds out then the building 480v system will stay running till a control shut down can be performed to correct the problem...

I would recommend going to some local IEEE meetings and meet with some of the guys there. They could give you some tips on who is hiring. Also if you want to learn the National Electrical Code- attend meetings that the Building Department Electrical Inspectors go too. They enforce the code on a...