Engineering-led sizing is our approach to designing power systems from measured demand and real usage patterns, not rough package assumptions. It is the difference between a system that merely looks correct on paper and one that performs correctly during outages, cloudy days, and high-load moments.
What It Means
Engineering-led sizing starts with your load profile, not with a panel count. We look at how much energy you use (kWh), how much power you draw at once (kW), when those loads happen, and which loads are essential versus optional.
- Daily consumption informs battery and solar generation requirements.
- Peak demand informs inverter sizing and surge headroom.
- Roof space, shading, and orientation affect how much solar production is realistically available.
Why It Matters
Incorrect sizing usually fails in one of two ways: the system is too small and underperforms, or it is too large and becomes unnecessarily expensive.
- Undersizing risk: Inverters trip, batteries drain too quickly, and clients lose confidence in the system.
- Oversizing risk: Clients pay for capacity they do not use, extending payback periods.
- Operational risk: Poor load assumptions can create performance issues long after installation.
How Iselle Implements It
We use a structured engineering workflow before final recommendations are issued:
- Review utility bills and project goals (backup duration, uptime targets, budget constraints).
- Map appliances and loads, including startup surges for motors and compressors.
- Assess site constraints such as roof area, shading, cable routes, and board conditions.
- Apply technical safety margins so the design remains stable under real operating conditions.
The result is a system design that is defensible, explainable, and easier to maintain over time.
Next Steps
If you want a sizing recommendation based on your actual property and usage, book a technical survey or start with the online estimate tool for a preliminary range.