Start with the electrical load
Power planning starts with understanding what the space needs to run. Lighting, refrigeration, cooking, water pumps, heating and cooling, electronics, tools, and other loads can have very different energy and peak-power characteristics.
A simple daily-energy estimate can help compare broad approaches, but averages do not tell the whole story. Some equipment may create short periods of high demand even when its total daily energy use is modest.
Understand the main power approaches
Grid-connected
A utility connection can provide external generation capacity and reduce the need for on-site energy storage. Connection is not automatically simple, though. Distance to existing service, utility requirements, site access, trenching, service equipment, and local rules can affect cost and feasibility.
Solar with storage
A solar-and-battery system can generate and store electricity on site. The planning challenge is matching generation and storage to the project's loads, location, operating schedule, weather patterns, and desired resilience.
Hybrid
A project can combine utility service with local generation and storage, or use backup generation for selected circumstances. Hybrid approaches can change the balance between up-front equipment, resilience, operating responsibility, and dependence on outside infrastructure.
For a broader comparison of grid-connected and off-grid approaches, see the Grid-Tied vs. Off-Grid guide.
Research solar generation
Solar generation depends on location, season, weather, shading, array orientation, equipment characteristics, and the amount of energy the project needs. A single national rule of thumb cannot account for those differences.
The Solar Planner can be used for an early estimate using daily electricity use and peak sun hours. Treat the result as a planning range rather than a final system size.
Research battery storage
Battery storage changes when electricity can be used, not how much energy the project ultimately needs. Research should consider the loads the battery is expected to support, desired backup duration, charging sources, operating conditions, usable versus nominal capacity, and replacement or maintenance expectations.
The Battery Sizing tool can help with an early planning estimate. Its output should be treated as an input to further research rather than a final battery specification.
When comparing batteries or complete systems, look beyond headline capacity. Manufacturer documentation may include limits for continuous and peak power, temperature, installation, charging, discharge, communications, warranties, and other characteristics that affect real-world use.
Check site and service constraints
The same power concept can work very differently from one property to another. Before getting deep into equipment comparisons, identify the conditions that could change the options.
- Is utility electrical service available, and where is the practical connection point?
- What are the site's solar exposure and shading conditions?
- Where could generation, storage, service equipment, and other components be located?
- What weather, temperature, moisture, access, or physical constraints could affect equipment?
- Which electrical, fire, utility, zoning, permitting, or inspection requirements apply?
- Which parts of the system require licensed design, installation, inspection, or other professional involvement?
These are research questions, not a substitute for checking the requirements that actually govern a particular site.
A practical research workflow
- List the electrical services the space needs and identify major loads.
- Use the Electrical Load tool to create a broad first-pass estimate.
- Determine whether grid service, solar, storage, backup generation, or a hybrid approach is worth investigating.
- Use the Solar Planner and Battery Sizing tool for early comparisons when those systems are under consideration.
- Write down site-specific constraints and unanswered questions.
- Compare manufacturer information and local requirements against the project assumptions.
- Get appropriate professional review before treating a system concept as ready for construction or installation.