Are my math figures correct?

[sensij]

Free mounts? Are you sure you know what you are getting?

Given the space limitations on your own roof, whose roof are you putting them on?

[gte]

I'm going to put them on the surrounding neighbors roofs as well as mine.... just kidding. I have a detached 3k sq ft garage that I built which has plenty of roof space also.

If you click the link you can see the free mounts

Free mounts? Are you sure you know what you are getting?

Given the space limitations on your own roof, whose roof are you putting them on?

[ButchDeal]

If you click the link you can see the free mounts

Link goes to generic page but they seem to include racking not mounts. Have you considered the SE11400? Going to be quite the interconnect to wire.

[gte]

I did mean racking and not mounting, mounts are an additional 3.1k. The free racking system saves me 4.6k

I have considered that inverter and I asked the seller to consider that inverter when I asked for the quote. He has not given me a full quote yet, once I receive that I will take a screen cap and post it here.

http://www.wholesalesolar.com/9900118/solaredge/inverters/solaredge-se11400a-us-u-inverter

Link goes to generic page but they seem to include racking not mounts. Have you considered the SE11400? Going to be quite the interconnect to wire.

[gte]

From my PoCo ... I'm sure they payout the wholesale rates, not the gross kwh rates


https://www.bge.com/myaccount/choosi...Questions.aspx

What if the meter runs backward more than it runs forward? If the energy generated by the customer-generator exceeds the energy supplied by the utility during the month, the customer-generator shall be required to pay only the customer charges for that billing month, as required by the Rate Schedule under which the customer-generator is receiving service. The utility will carry forward a negative kilowatt-hour reading for a period not to exceed 12 months and that ends annually with the April bill. The utility will pay each eligible customer-generator for the dollar value of any accrued net excess generation remaining at the end of the previous 12 month period ending with the billing cycle that is complete immediately prior to the end of April.

When do I need to start the Interconnection Process? Since many generator characteristics are required in the interconnection application, you may not be able to start the application process until after your system has been designed. It is important to begin the application process before you begin construction. This will allow BGE to review your application before your generator is constructed, which may help you avoid unnecessary construction costs should your design fail to meet the interconnection requirements.

What if I already installed a generator that is connected to the distribution system but do not have the interconnection documents? If you have an existing small generator that requires an interconnection application under the Maryland Small Generator Interconnection rules but have never applied for interconnection, you will need to contact BGE and submit an application for interconnection unless (1) you already have net metering covered by BGE’s tariff or (2) if you are not net metered but have signed an operating and maintenance agreement with BGE.

[gte]

My county told me the following, does anyone know the NEC rating for how much power I can feed into the bus panel via solar? I looked through the 2014 code but could not find that?



18" from peak for fire department
3' in center access way for fire department
BGE applicaiton after inspection for net meter


Here is the final quote, obviously the ancillary parts add decent amount of cost


80 Suniva OPT330-72-4-100 Silver Mono Solar Panel Solar Panels 1524520
80 IronRidge XR100 Option D racks per 77" X 39" Module inc. Grounding Racking 6913231
40 IronRidge Mounting Hardware Kit, T-Bolt 1/4" x 3/4" Racking 7800033
1 SolarEdge SE10000A-US-U Inverter Inverters 9900117
2 SolarEdge SE7600A-US Inverter Inverters 9900214
80 SolarEdge Power Box P400 Inverter Accessories 9994672
1 Four Star Solar MC4 Unlocking Tool Cables 9981081
6 Four Star Solar Dual MC4 10 AWG - 100' Cable Cables 9991055
1 Electrical Design Diagram Service 9000129

41.6k

60 Suniva OPT330-72-4-100 Silver Mono Solar Panel Solar Panels 1524520
2 SolarEdge SE10000A-US-U Inverter Inverters 9900117
60 IronRidge XR100 Option D racks per 77" X 39" Module inc. Grounding Racking 6913231
30 IronRidge Mounting Hardware Kit, T-Bolt 1/4" x 3/4" Racking 7800033
60 SolarEdge Power Box P400 Inverter Accessories 9994672
1 Four Star Solar MC4 Unlocking Tool Cables 9981081
4 Four Star Solar Dual MC4 10 AWG - 100' Cable Cables 9991055
1 Electrical Design Diagram Service 9000129

31.3k



-$4620 for free racking

240 6963152 Quick Mount PV E-Mount QMSE-A 9" x 12" Mill (Single) $13.00 $3,120.00

1 9000013 Service - Shipping & Handling $1,890.02 $1,890.02


Quote Total: $73,355.02


Obviously this does not include permits, etc

[sensij]

How many amps of PV are your inverters rated to produce? What is the rating of the panel(s) being fed?

[ButchDeal]

My county told me the following, does anyone know the NEC rating for how much power I can feed into the bus panel via solar? I looked through the 2014 code but could not find that?

It is going to depend on the rating of your MSP bus and the main breaker rating as well as if it is center feed or end feed.


your two options are an SE10000 and two SE7600 inverters for 120a or two SE10000 for 100a
so say your 200a service panel has a 200a bus and breaker then max you can feed into it is 40a. (bus rating X 1.2) - main breaker = max feed in for end feed.

In other words you are in the line side tap, special engineering range.

EDIT: I missed that this is not an option he is looking at 3 x SE10000 AND 2x SE7600, so a total of 200a (193a) feed in..... with just two 200a MSPs. yeah pretty sure you are looking at a service upgrade and special engineering.

[gte]

3 10kwh/240vac = 41.67A per unit (theoretical)
2 7.6kwh/240vac = 31.67A per unit (theoretical)
I have (2) 200amp panels in my house garage

How many amps of PV are your inverters rated to produce? What is the rating of the panel(s) being fed?

[sensij]

You should use actual inverter ratings, not theoretical calculations.

[ButchDeal]

What is between the two breaker panels and the the meter housing? there might be a chance to do something there if there is anything other than wire.
Also what is the meter and its housing rated? You might have to do a service upgrade as well (big bucks generally).
The service is probably 320a

[sensij]

400 A of panels can take 64 A max of rated inverter output. As butchdeal has said, line side tap is required for more. Reducing the main supply breaker could get more capacity as well.

[gte]

I found the datasheets, the 7.6kwh is 32 and the 10k is 42.

You should use actual inverter ratings, not theoretical calculations.

[gte]

Thanks for this info.

When my panel was upgraded, there was a service upgrade required and I was under the impression that was done. How can I verify?

The meter is on the outside of the attached garage wall and the panels are on the inside, so 8" of concrete I believe? I'd have to verify that by looking at it and see if the wire is routed around or straight through the poured foundation.

What is between the two panels the the meter housing? there might be a chance to do something there if there is anything other than wire.
Also what is the meter and its housing rated for? you might have to do a service upgrade as well (big bucks generally).

[gte]

Does this help?