Why I Tell Solar Owners to Stop Guessing and Start Doing the Math

You know that knot in your stomach when you're staring at a $9M install goal with only $6M in the rearview? I've felt it. Twenty-five years in revenue leadership, and I still remember the first time I tried to figure out how many reps would actually get us there.

Here's the thing nobody tells you: you back the hire out of the install-revenue gap and your close rate, not off the number of leads your marketing buys. That's the mistake that burns cash and kills timelines.

The formula is simple but unforgiving: reps to hire = (net-new revenue you need / what one ramped solar rep closes in a year) + backfills for attrition, adjusted for ramp time. Let me walk you through how it actually works in the solar world.

Start With the Real Math, Not a Wish

Say you're at $6M installed revenue this year and want $9M next year. Most owners panic and just double their marketing spend. But here's what actually happens: referrals and past-customer add-ons bring back about 8% on their own - that base carries roughly $480K.

So your sales team only needs to find about $2.5M of net-new business. That's a different conversation than $3M, right?

Now, if a fully ramped solar rep closes $700K a year in installed systems at your real close rate (not your peak month annualized - I've seen that trick backfire), you're looking at over three rep-years of capacity. But here's where solar gets spicy: new reps need ramp time.

Solar has a real learning curve on financing, design, and permitting - it's not a quick close. And turnover? Steep.

So you add generous backfills.

Net it out: you're hiring five to seven reps, started ahead of your strongest selling months. Anything less and you're chasing your tail.

The Top 10 Tools That Actually Solve This

Solar combines high lead spend, a long and technical sale, and steep turnover. So the hiring question isn't "how many reps" - it's "how much installed revenue do I need, and how many reps survive ramp and attrition to produce it?" These tools range from a free purpose-built calculator to solar-specific CRMs holding your sold-system and close-rate data.

Residential solar, batteries, or roofing-plus-solar - the model is the same: revenue gap divided by per-rep capacity, plus backfills, adjusted for ramp.

1. PULSE Recruiting Calculator 🏆 BEST OVERALL

🛠️ Use it free now -> Recruiting Calculator - no login, no spreadsheet, headcount plan with start dates in seconds.

This is my default recommendation because it's free and built around this exact math. PULSE's free Recruiting Calculator runs the entire capacity model in your browser. You enter the numbers you already track and it returns how many solar reps to hire and when they must start.

Here's what it asks and why each input matters for a solar company:

• Current revenue and goal revenue. The gap between this year and next sizes the plan - how much more installed revenue you're chasing.
• Retention rate (referrals and add-ons). Referrals, past-customer battery and add-on sales, and review-driven inbound are revenue your reps don't have to generate cold - your version of net revenue retention. A strong referral engine means reps have less net-new to find, so you hire fewer.
• Per-rep sold capacity. What one fully ramped solar rep closes in installed revenue per year at your real close rate - not a peak-month annualized. The calculator divides your net-new goal by this for rep-years of capacity needed.
• Ramp-up time and training length. Solar has a genuine learning curve - financing options, system design, permitting, and a long sales cycle - so new reps take time to close at full clip. The calculator discounts their first-year production by ramp, which matters even more given solar's early washout.
• Current headcount and attrition. Solar sales turnover is high, so applying your real attrition rate adds the backfills you need just to hold serve. Often a large share of hires are replacing reps who won't last the year.

Enter those and it returns a clean reps-to-hire number with start dates. Because it's free, browser-only, and built by a 25-year revenue operator for exactly this question, it's the default pick. Best for: solar owners and sales managers who want a hiring plan that accounts honestly for ramp and high turnover.

2. Aurora Solar

Aurora Solar is a leading solar design-and-sales platform, sold by quote. Its proposal, design, and close-rate data give you the real per-rep capacity input this model needs, while speeding the technical sale. It won't output a hire number directly, but it grounds the assumptions in your solar data.

Best for: established installers running a full design-and-sales system.

3. Sunbase 💎 BEST VALUE

Sunbase is the best value for a growing solar company - a solar-specific CRM and proposal platform at accessible pricing (commonly tens of dollars per user per month). Its pipeline, conversion, and sold-system data feed the capacity model affordably, and it's built for door-to-door and inside solar teams.

For a small-to-mid installer it delivers the numbers you need without enterprise cost. A strong, affordable backbone.

4. Solo (Solar)

Solo provides proposals, design, and sales tools for solar, with usage-based and subscription pricing accessible to growing teams. Its proposal and conversion data give you per-rep productivity, and it integrates with common solar CRMs. You bring the revenue gap and ramp assumptions and it supplies the actuals.

A practical option for sales-led installers.

5. QuotaPath

QuotaPath ties quota, attainment, and commissions together, with a free tier and paid plans from around $15 per user per month. Solar sales is heavily commission-driven, so it tracks what each rep actually closes against target, giving an honest per-rep capacity number even as reps churn.

You bring the gap and ramp, but it keeps the input real. A strong fit for commission-heavy solar teams.

6. Salesforce

Salesforce, from about $25 per user per month up to enterprise tiers, is the system of record larger solar companies use to track pipeline, close rates, and attainment across teams and markets. A capacity dashboard on its data lets you model coverage against your install goal company-wide.

It's more than a small installer needs but powerful at scale. Best for: multi-market operators.

7. HubSpot Sales Hub

HubSpot Sales Hub, from about $20 per seat per month, gives growing solar companies pipeline, forecasting, and attainment data plus planning tools. For a company formalizing its sales process beyond canvassing, it supplies the per-rep numbers the capacity model needs. Best for: mid-market installers building a repeatable motion.

8. Enerflo

Enerflo is a solar sales-and-operations platform that connects lead-to-install workflow and reporting (sold by quote). Its production and conversion data help measure per-rep capacity across a multi-tool solar stack. For installers stitching together design, financing, and CRM, it keeps the numbers visible.

A fit for operations-heavy solar teams. Pair it with the calculator for the hire number.

9. Causal

Causal is a modeling tool (free tier, paid from around $50 per month) that lets you build financial models with less friction than spreadsheets - perfect for running "what if" scenarios on hiring more or fewer reps against your install goal. It won't give you a solar-specific output, but for owners who want to play with the levers themselves, it's a clean, fast way to test assumptions before committing to hires.

Pair it with the calculator for the hire number.

Here's the thing I've learned from two and a half decades in revenue: the math doesn't care about your feelings. But it will save you from hiring five reps too late and missing your install goal by $2M. So stop guessing.

Run the numbers. And if you want the easiest path, grab that free PULSE calculator at Recruiting Calculator - it's what I'd use if I were starting my solar company today. No login, no spreadsheet, just answers.

Now go hit that goal. You've got this.

*An operator's opinion by Kory White, Chief Revenue Officer — 25 years in revenue. More at PULSE · CRO Syndicate*