In this guide 6 sections
Ready proposal tools handle the quote well, with roof layout, shading, string sizing and a printable proposal for the customer, and then they stop. A custom build earns its cost when procurement, installation, net metering paperwork, commissioning and service tickets must hang off the same job record as that quote. That is the dividing line.
What each type of tool actually covers
A design and proposal tool takes a satellite image or a survey sketch and returns a layout, a bill of materials and a generation estimate. It is built for the salesperson. It does that one job well.
A general CRM tracks the lead, the call notes and the follow-up reminders, and an accounting package raises the invoice and records the supplier bill. Neither knows an inverter serial number.
A custom build is the only option that starts from your own job flow instead of bending that flow to fit a vendor’s screens. You also pay for the design.
- Proposal tool: roof drawing, shading loss, module and inverter selection, quote PDF
- General CRM: leads, follow-ups, call history, email templates
- Accounting package: invoices, supplier bills, stock value, bank reconciliation
- Custom build: one job record from survey to the last service visit
Where the job outgrows the quote
After signing, the proposal tool goes quiet. The surveyor’s measurements, the approved single line diagram and the final bill of materials now sit in three places, and none of them agree.
Procurement is where the gap shows first. The installer orders modules, an inverter, mounting rails, DC cable and an earthing kit, and someone must compare that order against the quote. A swapped module changes the promise.
Then comes the utility. Net metering applications, inspection dates and meter replacement run on the discom’s calendar, so a tool that cannot hold a pending approval leaves the chasing to one person’s memory.
What a custom build has to connect after the quote
Start from the handover points. Survey to design, design to purchase order, purchase order to goods receipt and goods receipt to the installation crew’s checklist are the handovers where a number gets retyped.
Commissioning is the step most teams under-record. The crew captures string voltages, insulation resistance readings, inverter commissioning photos and the customer’s sign-off, and those readings become the baseline for every later fault call.
Service closes the loop. A ticket for a tripped inverter should open against the exact job and show the installed model, the warranty start date and the last cleaning visit.
- Survey sheet linked to the proposal revision the customer approved
- Purchase orders and goods receipt matched to the signed bill of materials
- Utility application status and inspection dates held on the job
- Commissioning readings and photos stored against serial numbers
- Warranty clocks and service tickets raised from the same record
When ready tools are enough and when they are not
A small team doing a handful of rooftop jobs a month can run a proposal tool, a shared sheet for procurement and an accounting package. It will be untidy, but it works. Skip building what fits in memory.
Growth changes the answer. With several crews or commercial and utility-scale work, milestone billing, subcontractor payments and site-wise material issue matter, and spreadsheets start to disagree with each other.
A middle path is common. Keep the proposal tool for what it does well and build only the layer that receives its output and carries the job forward. Swapping it later loses nothing.
How to decide this month
Pick your last five completed jobs. For each, trace how long it took to find the commissioning readings, the final bill of materials and the utility approval letter. Count the jobs with a missing one.
If missing records are rare, a ready toolset is probably enough, but if they are common, you have a connection problem and not a quote problem.
List the failing handovers. Bring that list to any vendor, ready or custom, and ask them to show each handover working on a real job from your files.
Solar job-flow gap worksheet
Each row is a job stage, running from site survey, proposal and procurement through installation, utility approval, commissioning and the service visits that follow it. Columns show which tool holds the record today, who retypes it, when it last went missing, and whether a ready tool or a custom build would cover it. Fill it in as a team.
Open a blank worksheet to printQuestions owners ask
Can a solar design tool also run my projects?
Some include basic stages. Check whether they also hold purchase orders, serial numbers, utility approvals and service tickets, because if not, you will still need something beside them.
Should the accounting package be replaced in a custom build?
Usually it should stay. Keep the ledger where your accountant works and send it clean invoice and bill data from the job record, so nothing is typed twice.
What is the first piece worth building?
Start with the handover. It is where retyping is heaviest, where mistakes reach the customer, and where the signed proposal must turn into a purchase order and a crew checklist.