Home Solar Installation Break-Even: About $120K Monthly Revenue

Fixed costs $75.5K/mo Core overhead base

Contribution margin 71% After variable costs

Break-even revenue $106.4K/mo Revenue at zero profit

Break-even timing Month 4 Launch ramp point

Break-even calculator

Test monthly revenue, variable expenses, and fixed costs against break-even for a home solar installation service.

Lean Base Full

Monthly revenue Revenue sets the cash left after direct costs to cover overhead. $ Low sales High sales Variable expenses Direct costs that rise with each installation, like equipment, labor, and permit fees. $ Low costs High costs

Money available to cover fixed costs $430,447 $596,250 revenue - $165,803 variable expenses

Margin ratio

72%

Covers fixed costs

Yes

Fixed monthly costs Monthly overhead the service pays even before new jobs start. $ Low overhead High overhead

Break-even chart Revenue Total costs

Which home solar installation expenses are fixed, and which move with sales?

Cost classification

Break-even gets shaky when job-level expenses get mixed with monthly overhead. Treat capex as cash runway, not contribution margin, so Month 4 break-even stays tied to operating economics.

Expense	Cost	Break-Even Treatment	Common Mistake
Warehouse and Office Rent	Fixed	Use $7,500 per month as baseline overhead before contribution margin.	Treating rent as lower per job when volume rises.
Installation Fleet Insurance	Fixed	Include $2,800 per month in fixed operating overhead.	Spreading insurance only across completed installs.
Solar Design and CRM Software Subscriptions	Fixed	Include $1,400 per month before calculating break-even jobs.	Leaving software out because it is not job labor.
Solar Equipment and Hardware Components	Variable	Subtract 18.0% of first year revenue from sales to find contribution margin.	Putting panels and hardware into fixed overhead.
Contractor Installation and Electrical Support	Variable	Apply 5.0% of first year revenue as job-linked delivery expense.	Modeling contractor support as a flat monthly bill.
Sales Commissions and Referral Fees	Variable	Deduct 4.0% of revenue because it moves with signed customers.	Counting commission inside payroll instead of sales volume.
Salaried Field and Office Staff	Semi-fixed	Use $715,000 of first year payroll, then step it up as FTE count rises.	Assuming each salary changes smoothly with every install.
Annual Marketing Budget	Semi-variable	Plan $120,000 in first year spend, tied to a $1,800 customer acquisition cost.	Treating marketing as pure overhead and ignoring lead volume.

How does break-even shift from a lean launch to a full solar installation operation?

Scenario table

As revenue scales, the margin on each dollar earned improves from 71.0% to 75.8%, but fixed overhead also rises. That makes break-even tight at launch, steadier in the middle, and much safer in the mature case.

Planning view only; these are model assumptions, not guarantees.

Scenario	Monthly Revenue	Variable Costs	Fixed Costs	CM Ratio	Operating Profit	Break-Even Signal
Lean launch case	$285.5k	$82.8k	$85.5k	71.0%	$117.2k	Tightest cushion; a weak month can slip below break-even.
Base growth case	$894.9k	$238.1k	$144.7k	73.4%	$512.1k	Healthy cushion, but steady bookings still matter.
Full mature case	$1,861.7k	$450.4k	$200.5k	75.8%	$1,210.8k	Strong cushion; overhead is absorbed more cleanly.

What can push this solar installer off its break-even track?

Stress test

The opening plan clears break-even, but the cushion tightens fast if sales miss, overhead steps up, or margins slip. Here’s the quick math: Year 1 fixed costs are about $0.91M a year, and break-even sits near $1.41M of revenue.

Stress Case	Changed Assumption	Break-Even Revenue	Revenue Gap	Risk Signal
Current plan	No change.	$1.41M	$2.02M cushion	The launch plan clears break-even with room to spare.
Revenue shortfall	Launch revenue lands $1.65M below plan.	$1.41M	$0.37M cushion	A large sales miss still stays above break-even, but the buffer gets thin.
Fixed-cost increase	Year 2 overhead rises to $1.11M a year.	$1.72M	$1.70M cushion	More staff and overhead lift the floor, so hiring needs tight control.
Margin pressure	Variable expenses rise 5 points of revenue.	$1.53M	$1.90M cushion	Small cost slippage pushes break-even up, even if sales hold.
Combined pressure	Revenue is $1.65M lower, Year 2 overhead hits, and variable expenses rise 5 points.	$1.87M	$0.09M gap	Slower installs plus higher costs can push Month 4 break-even out.

What should a home solar founder verify before locking the fleet, hires, and ad spend?

Founder checklist

Don't lock the fleet, hires, or ad budget until you can show about 15 installs a month, keep CAC near $1,800, and carry enough cash through Month 4. The model reaches breakeven in Month 4, but the real test is whether demand and staffing arrive before the cash trough.

1Demand proof15 installs/mo

Verify booked installs can reach about 15 a month before you spend the full Year 1 marketing budget, because that is what makes the launch pipeline real.

2Fixed burn$75.6K/mo

Check that rent, insurance, software, admin, and payroll stay near this burn, because every extra fixed dollar pushes break-even out.

3Unit margin71% CM

Keep equipment, contractor, commission, and permit costs inside the 71% contribution margin, or the model loses room fast.

4Staff ramp4 FTE

Hire to the work in hand, since Year 1 starts at 4 technician FTE and a faster ramp only works if scheduled installs fill it.

5Cash floor$666K

Keep at least this cash available through Month 4, when the model hits its low point, so launch spending does not trap you.

6Capex stage$187K

Stage the $145K fleet and $42K tooling buys last, because they lock in most of the launch capex before demand is proven.