Your customers need a solar array that actually works for their site—not a guessed-at system that underperforms in winter or costs $15,000 more than necessary. A proper site assessment is the difference between a cabin owner with year-round power and someone rationing electricity by September. If you're offering solar, battery, or hybrid power services, mastering site assessments is how you close deals and build your reputation.
Why Site Assessments Drive Revenue
Most cabin owners skip proper assessments because they underestimate complexity. They'll call with "I need 5kW solar" when their actual winter load is 2kW and their site gets 3.2 peak sun hours daily instead of the national average 4.5. A thorough assessment lets you right-size systems, justify pricing, and avoid warranty claims from undersized batteries or shaded arrays.
Assessments also create trust. When you show a client their actual solar potential using shade analysis and production modeling, they'll pay for quality rather than shopping by price alone. You'll also identify site constraints—roof pitch, tree cover, soil conditions for pole mounts—that competitors miss, letting you win projects others bid wrong on.
What a Professional Site Assessment Includes
Solar resource evaluation is foundational. Use tools like PVWatts or Solargis to model annual production for the specific latitude and microclimate. Visit the site during different seasons if possible; a cabin shaded by deciduous trees in summer but clear in winter tells a different story than winter-only shading. Document roof azimuth, pitch, and obstructions. For ground mounts, assess soil conditions and erosion risk—mountain properties often present challenges that add $2,000–$5,000 to installation costs.
Load analysis requires more than asking "what do you run?" Walk through the cabin and identify every appliance, HVAC system, and water pump. Calculate demand for winter months when solar production dips; that's your constraint. Ask about future plans—adding a guest cabin, EV charging, or heated greenhouse changes everything. Winter loads typically run 40–60% higher than summer due to heating and reduced daylight hours.
Battery and backup requirements depend on autonomy needs. Is the cabin occupied year-round or seasonally? A weekend retreat can use smaller batteries (10–15 kWh usable) with a propane backup generator, while year-round living may demand 30–50 kWh with minimal generator runtime. Factor in battery chemistry costs: lithium (LiFePO₄) runs $5,000–$8,000 per usable kWh installed, while lead-acid costs $1,500–$2,500 per kWh but requires larger capacity due to depth-of-discharge limits.
Infrastructure and permitting assessment separates thorough operators from amateurs. Check utility interconnection requirements, even for off-grid systems—some counties require grid-tied documentation. Verify setback distances for pole mounts (usually 1.5x height minimum). Document soil composition, groundwater depth, and access for service vehicles. Identify propane or fuel storage locations and any environmental constraints.
Structuring Your Assessment Service
Offer tiered assessments to match customer budgets:
- Basic assessment ($300–$500): Solar resource mapping, load estimate, preliminary system size, 1–2 site visits
- Detailed assessment ($800–$1,500): Full shade analysis with solar pathfinder, measured electrical loads, battery sizing, equipment layout, 3D production modeling
- Premium assessment ($1,500–$2,500): Includes soil testing, topographic survey, structural engineer review, permitting pre-flight, detailed ROI and financing analysis
Bundle assessments with system quotes at a discount—charge $1,000 for assessment alone, or $500 when bundled with a $30,000+ solar installation. This incentivizes moving from evaluation to contract.
Charge travel fees for remote sites ($150–$300 per hour beyond 30 miles) since cabin properties often mean 2–3 hour drives. Collect this upfront via invoice or deposit to filter serious clients.
Tools and Documentation
Invest in a solar pathfinder app (Solmetric SunEye runs $3,500–$4,000 but pays for itself in accuracy and customer confidence), a basic multimeter and clamp meter for electrical measurement, and aerial imagery tools like Google Earth Pro and drone footage for large properties. Document findings in a professional report with production charts, system diagrams, and equipment recommendations tied to specific products with pricing.
Building a strong assessment capability—and listing your services on Mercoly—positions you as a specialist rather than a generalist, helps customers find you online, and gives you the data to win competitive bids.
Frequently Asked Questions
Q: How do I estimate winter production accurately for systems in snowy regions? A: Use site-specific PVWatts data adjusting for local snowfall frequency, and assume 10–20% production loss in winter months compared to summer; model conservatively assuming panels are cleared monthly but don't achieve summer angles.
Q: Should I charge for assessments if the customer doesn't buy from me? A: Yes—a thorough assessment costs you $200–$400 in time and tools; charge $500+ upfront so only serious prospects book, then credit 30–50% toward installation if they hire you.
Q: What's the typical timeline from assessment to installation? A: 2–4 weeks for design and permitting, 3–8 weeks for equipment lead times (longer for batteries and hybrid inverters), and 2–5 days onsite for installation—so plan 2–4 months total for residential systems.
Start booking site assessments this month and watch your close rate climb.