Many successful companies use our permit drawings...

... to slash their design costs and become more competitive!

Sample Pages From a Typical Permit Set

(Click on a drawing to enlarge)

Sample Cover Sheet

Sample PV Layout sheet

Sample Electrical Sheet

OR Download the complete permit set (16 pages, PDF)

Try Us Out For Free

There's nothing like a firsthand opinion when evaluating a service for your own use. If you are in business as a solar power installer, we will be happy to provide you a free trial by creating a permit set free of cost based on your inputs.

How You Will Become More Competitive

Your competitiveness will increase because of the sheer cost reduction stemming from outsourcing solar power design to us. Here are some of the ways your cost will go down:

No Monthly Salaries: You only pay per permit set
No Extra Overheads: Save on extra office space, hardware, software, utilities for a design team
Low Price: Others charge up to $150 while our price can be lower than $40.

TMG’s solar power engineering team has designed more than FIVE THOUSAND solar installations, incorporating from a few dozen modules to 100s of modules, with batteries and without.

The Solar Power Consulting Team at TMG

Team Overview:

TMG has a large team dedicated to solar power system design and produces several hundred designs a month. Almost all these designs are turned around overnight.

Team Composition

The team comprises managers, project leaders and drafters. The project leaders and drafters work only on solar power system design projects full-time. Our managers have each supervised thousands of designs during their tenure at TMG.

Above: Solar Power Consulting Team Structure

Team Skills

TMG’s solar power consulting team is well-versed in the nuances of solar power system design, such as

The optimal roof faces for panel placement (depending on the geographic location of the target site)
Norms for the spacing between arrays
Conventions for clearance between arrays and roof edges
Rules for combining array outputs before connecting them to inverters
The particular characteristics and data of the leading inverters and solar modules
The connection methods for combiner boxes, ac disconnects and the utility meter

Consequently your technical personnel will not have to spend time training us and can look forward to comprehensive designs from the inception of the contractual arrangement with us.

Quality Assurance

Like any conscientious company practicing solar power system design, TMG constantly tries to achieve a zero defect rate in its output. Over the course of more than four thousand projects, we have evolved an effective quality assurance system that has reduced defects to near-zero levels. The system comprises the following methods:

The work of each drafter is checked 100% by his project leader
The same files are then checked 25% by the manager who oversees the project leader
Project leaders and drafters are counseled with directions to avoid any errors that were found
Executive management discusses quality improvement for each project during its weekly review meeting
We schedule a weekly videoconference with you to ask if there were any errors in our solar designs that we were not aware of.

TMG's Solar Power System Design Procedure

TMG’s solar power consulting team has over the long-term evolved an efficient and streamlined procedure for developing designs.

Step One: Obtain Inputs

In this step, TMG requests the following from you:

A photograph or sketch of the target to roof (plan view) with protuberances such as pipes and vents visible
The scale factor of the above image or dimension information
Your preferred make and model number of solar modules and inverters
The power you expect the system to generate
Data on rafter width and spacing
Your preferred locations for electrical hardware such as the sunrun meter, the load center and the inverters.

Video: More Detail on Obtaining Inputs

Step Two: Position Arrays

TMG's team positions the solar PV arrays using the following methods:

Identify the optimal roof slopes (if rooftop installation) and tilt angles for solar energy capture based on the geographic location of your site
Define the size of each array based on standard industry guidelines
Locate the arrays on the target surfaces by avoiding protuberances, following clearance guidelines and avoiding shadows from adjacent objects
Plot the positions of the attachment points and define the mounts that have to be used based on the characteristics of the roof or mounting surface.

Video: More Detail on Positioning Arrays

Step Three: Design Electricals

TMG's solar power consulting team designs all interconnections and specifies electrical hardware using the following methods:

Define stringing cables based on anticipated current flow
Interconnect arrays with the appropriate type of cable and junction boxes
Define the electrical connections to the electrical support components, including the inverter, solar power meter and disconnect switch.

Video: More Detail on Designing Electricals

Step Four: Package the Design

TMG processes the design information thus created as follows:

We create a cover sheet using your template and layout preferences. The cover sheet typically includes a satellite view of the target site, a street map to the site, information on the power generated by the solar installation as well as the model, make and quantity of the proposed modules.
We create a layout sheet to scale showing the module layout with attachment points
We create a single-line electrical diagram detailing electrical connections and specifying associated switchgear
We save each of the above drawings in PDF format, put them in the folder and create a zip file of the folder
We email you the folder.