What Is LTV:CAC Ratio?
LTV:CAC ratio compares a customer's lifetime value (LTV) to the customer acquisition cost (CAC) it took to win them, expressed as a ratio, and the commonly cited healthy target across industries, including solar, is 3:1, meaning a customer is worth roughly three times what it cost to acquire them.
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LTV:CAC ratio compares a customer's lifetime value (LTV) to the customer acquisition cost (CAC) it took to win them, expressed as a ratio, and the commonly cited healthy target across industries, including solar, is 3:1, meaning a customer is worth roughly three times what it cost to acquire them.
LTV:CAC Ratio explained
The ratio has two independent levers, and it is easy to fixate on only one of them. Cutting CAC improves the ratio. So does growing LTV. A company that only watches its acquisition cost while ignoring the lifetime-value side of the equation is managing half the problem.
With CAC projected to spike 40% to $0.84 per watt in 2026, hitting the same 3:1 target increasingly depends on growing LTV rather than assuming CAC comes back down on its own; the 2025 low of $0.60 per watt was a one-time anomaly tied to the 25D expiration rush, not a stable baseline to plan around. Batteries, EV chargers, and referrals are the documented levers installers are actually using to move the LTV side: national battery attach rate hit 45% in Q1 2026, and referral-sourced leads close at roughly 37.5% net versus 25% for phone-sourced leads, meaning referrals arrive with a built-in LTV advantage on top of costing next to nothing to originate.
A ratio that looked healthy in 2025 can quietly compress in 2026 even with an unchanged close rate and margin, purely because the acquisition-cost side of the equation moved.
Why it matters when you're buying
If your CAC is rising and you are not deliberately building LTV through add-on products and referrals to compensate, your LTV:CAC ratio is degrading even if every other number in your business looks unchanged. Track both sides, not just the acquisition-cost side.
Frequently Asked Questions
What is a good LTV:CAC ratio in solar?
Why is LTV:CAC ratio harder to hit for solar companies in 2026?
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