Finding the Right Balance Between Clarity and Complexity in PV+Storage Projects
1. Why System Diagrams Matter
In solar and storage projects—whether for small commercial rooftops or industrial energy storage—a system diagram is the blueprint for everyone involved.
- For engineers, it’s a technical reference for wiring and configuration
- For installers, it’s an installation guide
- For clients, it’s a visual explanation of how components work together
- For regulators, it’s part of compliance documentation
But there’s a problem: Too much detail can overwhelm non-technical audiences, while too little detail can cause costly mistakes.
So, how much detail is “just right”?
2. The Two Main Types of System Diagrams
A. Single-Line Diagrams (SLD)
- Shows electrical paths with minimal visual clutter
- Used mainly for permitting, compliance, and electrical planning
- Focuses on cable routes, breakers, fuses, grounding
Best for: Engineers, electricians, and approval authorities
B. Block Diagrams / Concept Diagrams
- Shows main components and flow of energy
- Simplifies complex systems into clear blocks (PV → Inverter → Battery → Load)
- Great for sales presentations and client education
Best for: Non-technical stakeholders, early project discussions
3. The “Goldilocks” Principle of Detail
The right amount of detail depends on who will use the diagram and at what stage of the project:
| Audience | Detail Level | Purpose |
|---|---|---|
| Sales & Clients | Low | Show benefits and basic flow |
| Installers | Medium | Show wiring paths, safety devices |
| Engineers & Inspectors | High | Full specs, standards, and part IDs |
4. Key Elements to Include
Regardless of complexity, a good PV+Storage system diagram should always include:
- Major Components
- PV modules, inverters, batteries, control panels, meters
- Energy Flow Direction
- Use arrows to indicate PV → Battery → Load → Grid
- Connection Points
- AC/DC junctions, combiner boxes, grid interconnection
- Protection Devices
- Breakers, fuses, surge protectors, disconnect switches
- Labels & Legends
- Clear text for component names, voltages, and ratings
5. When to Keep It Simple
A simplified diagram works best for:
- Client proposals (focus on ROI, not wire gauge)
- Public tenders where too much proprietary detail might be risky
- Marketing materials to avoid confusing visuals
6. When to Go Deep
A highly detailed diagram is essential for:
- Electrical safety inspections
- Construction drawings for installers
- Troubleshooting documentation after commissioning
In these cases, detail such as cable size, breaker ratings, grounding methods, and busbar specifications is critical.
7. Common Mistakes in System Diagram Design
❌ Using too many technical symbols for non-technical readers
❌ Omitting safety devices to “simplify” the drawing
❌ Forgetting to update diagrams after design changes
❌ Mixing AC and DC lines without clear labeling
8. Best Practices for Multi-Audience Use
If one diagram must serve multiple audiences:
- Create two layers—a high-level view and a zoomed-in technical view
- Use color coding (e.g., yellow for DC, red for AC, blue for comms)
- Add a short legend so anyone can follow the diagram without guessing
9. The Right Detail at the Right Time
There’s no single “correct” level of detail for all system diagrams.
The key is to adapt complexity to the audience and project stage.
A well-designed system diagram should:
- Clearly show energy flow
- Indicate critical components and protections
- Provide enough detail for its intended use—but not more than necessary
By striking this balance, you can improve clarity, reduce errors, and speed up project approvals.
