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Re: Our solar production

Posted: Tue Jul 11, 2017 9:33 am
by dgpcolorado
DuncanCunningham wrote:i'm new to this solar thing. I got a ground mount system. 24 panels. 12 inverters...
Nice data collection system. Since 2008 I've been reading my meters manually, before the inverters shut down for the evening, and later entering the data on a spreadsheet — very "old school," but fun!

Re: Our solar production

Posted: Tue Jul 11, 2017 10:23 am
by dgpcolorado

Code: Select all

Solar production for May:
            700 W        2170 W
          Old Panels    Old+New Panels
May-09      108 kWh
May-10      122 kWh
May-11      111 kWh
May-12      127 kWh
May-13      119 kWh      338 kWh
May-14      111 kWh      313 kWh
May-15       90 kWh      250 kWh
May-16      106 kWh      300 kWh
May-17      112 kWh      319 kWh


Code: Select all

Solar production for June:
             700 W        2170 W
          Old Panels    Old+New Panels
June-09      101 kWh
June-10      117 kWh
June-11      134 kWh
June-12      120 kWh
June-13      124 kWh      356 kWh
June-14      122 kWh      349 kWh
June-15      117 kWh      333 kWh
June-16      107 kWh      303 kWh
June-17      127 kWh      365 kWh


Solar panels at summer solstice 15º pitch:

Image

Image

Re: Our solar production

Posted: Tue Jul 11, 2017 10:37 am
by DuncanCunningham
I would love to have tracking on mine. Maybe another day? You have a lot of kwh totals from those panels. Really over 100kWh per day?

Re: Our solar production

Posted: Tue Jul 11, 2017 12:21 pm
by dgpcolorado
DuncanCunningham wrote:I would love to have tracking on mine. Maybe another day? You have a lot of kwh totals from those panels. Really over 100kWh per day?
No! those are monthly totals for the various years! A good day for me here is 13 kWh.

A good way to look at production is total energy produced divided by the rated power of the panels. So, for a sunny day production of 13.3 kWh divided by 2.17 kW I get 6.13 hours of rated production. Of more interest is the annual total divided by days and rated power. For 2016 I got:

3227 kWh/365 days = 8.84 kWh/day average
8.84 kWh/2.17 kW = 4.07 hours, which is pretty good for my latitude, 38ºN, and climate zone (mountain snowbelt; lots of clouds in the mountains).

This is a good way to compare the overall production of a system to installations in other geographic areas.

Re: Our solar production

Posted: Tue Jul 11, 2017 1:10 pm
by DuncanCunningham
i've only been going for about 3 weeks. I'll have to see how it goes. I have no preconceived notions of how it should look. just going with the flow right now. the limit in our city was 10kW system. I should have taken it to the max but I'm happy so far.

Re: Our solar production

Posted: Mon Jul 17, 2017 11:59 am
by mnsolardriver
I installed 13.2 KW system last year using 44 SolarWorld 300 watt panels. 10 each on my east & west facing garage roofs and 24 on the south facing roof of my home.

Since install in late June 2016, I have produced 12.4 MWh while using 9 MWh. 3.4 MWh sent back to the grid. There were a few weeks in there where I wasn't able to monitor while they installed various meters and equipment.

This has been a very worthwhile, long-term investment a little over a year in.

Re: Our solar production

Posted: Mon Jul 17, 2017 1:21 pm
by DuncanCunningham
mnsolardriver wrote:I installed 13.2 KW system last year using 44 SolarWorld 300 watt panels. 10 each on my east & west facing garage roofs and 24 on the south facing roof of my home.

Since install in late June 2016, I have produced 12.4 MWh while using 9 MWh. 3.4 MWh sent back to the grid. There were a few weeks in there where I wasn't able to monitor while they installed various meters and equipment.

This has been a very worthwhile, long-term investment a little over a year in.


I"m not allowed to add to my solar system now.. if I do it would have to be classed as a NEW system and I would be put onto a tariff metering which is not as nice for me. Right now it's net metering and kwh for kwh the same in as the price is out.

I could do a stand alone system on my garage, like yours. It has a gable end facing south so I could do a east and west setup on it. I'd have to collect the power into batteries and then I could use them to charge my cars. Not sure how to do that, probably have to get a bunch of Tesla power walls for that.

I do have a TED energy monitor that I could hook up to my circuits feeding the car charging and see what daily numbers I get.

Re: Our solar production

Posted: Mon Jul 17, 2017 1:28 pm
by mnsolardriver
DuncanCunningham wrote:
mnsolardriver wrote:
I"m not allowed to add to my solar system now.. if I do it would have to be classed as a NEW system and I would be put onto a tariff metering which is not as nice for me. Right now it's net metering and kwh for kwh the same in as the price is out.

I could do a stand alone system on my garage, like yours. It has a gable end facing south so I could do a east and west setup on it. I'd have to collect the power into batteries and then I could use them to charge my cars. Not sure how to do that, probably have to get a bunch of Tesla power walls for that.

I do have a TED energy monitor that I could hook up to my circuits feeding the car charging and see what daily numbers I get.



I see Tesla is taking pre-orders for their solar roof, which are nice looking shingles and they roll the cost of the powerwall into the pricing. A 14 kWh powerwall would cover a lot of driving (50 miles / day or so in a LEAF) without you losing the excess power to the utility.

Net metering is really what gives you the payback and I'm fortunate that this is the set-up in Minnesota.