Solar Energy Potential in Lahaina, Hawaii

Lahaina, Hawaii, located at 20.9174°N, -156.6772°W, offers excellent conditions for solar photovoltaic (PV) energy generation throughout the year. This tropical location benefits from consistent sunlight patterns that make it highly suitable for solar power production. The seasonal solar energy output in Lahaina demonstrates strong generation potential year-round. During summer months, solar panels can produce an impressive 7.80 kWh per day for each kilowatt of installed capacity. Spring follows closely with 7.07 kWh/day, while autumn generates a respectable 6.15 kWh/day. Even during winter, which sees the lowest production, panels still produce a substantial 4.83 kWh/day per installed kilowatt. For fixed solar panel installations in Lahaina, the ideal tilt angle to maximize year-round energy production is 18 degrees facing South. This specific angle optimizes the capture of solar radiation throughout the year, accounting for Lahaina's tropical latitude and the seasonal variations in the sun's position.

Environmental and Weather Considerations

Despite Lahaina's favorable solar conditions, several factors can impact solar production at this location:

• Salt air exposure can accelerate corrosion of solar equipment due to Lahaina's coastal location. This can be mitigated by using marine-grade components and applying protective coatings to metal parts.
• Volcanic haze (vog) from Kilauea volcano can occasionally reduce solar irradiance. While typically minimal in Lahaina, installing slightly higher capacity systems can help compensate for these periodic reductions.
• Tropical storms and hurricanes, though relatively rare, can damage solar installations. Using hurricane-rated mounting systems and panels certified for high wind loads is essential.

Proper maintenance is particularly important in this environment. Regular cleaning helps remove salt deposits and volcanic dust that may accumulate on panels. Additionally, installing microinverters or power optimizers can minimize production losses when partial shading occurs from passing clouds, which are common in tropical environments. The highest solar production in Lahaina occurs during the late spring and summer months (April through August), making this an ideal time for energy-intensive activities. The winter months (November through January) see somewhat reduced output but still provide substantial generation compared to many mainland U.S. locations.

Note: The Tropics are located between 23.5° North and -23.5° South of the equator.

So far, we have conducted calculations to evaluate the solar photovoltaic (PV) potential in 4253 locations across the United States. This analysis provides insights into each city/location's potential for harnessing solar energy through PV installations.

Link: Solar PV potential in the United States by location

Solar output per kW of installed solar PV by season in Lahaina

Seasonal solar PV output for Latitude: 20.9174, Longitude: -156.6772 (Lahaina, United States), based on our analysis of 8760 hourly intervals of solar and meteorological data (one whole year) retrieved for that set of coordinates/location from NASA POWER (The Prediction of Worldwide Energy Resources) API:

 

Ideally tilt fixed solar panels 18° South in Lahaina, United States

To maximize your solar PV system's energy output in Lahaina, United States (Lat/Long 20.9174, -156.6772) throughout the year, you should tilt your panels at an angle of 18° South for fixed panel installations.

As the Earth revolves around the Sun each year, the maximum angle of elevation of the Sun varies by +/- 23.45 degrees from its equinox elevation angle for a particular latitude. Finding the exact optimal angle to maximise solar PV production throughout the year can be challenging, but with careful consideration of historical solar energy and meteorological data for a certain location, it can be done precisely.

We use our own calculation, which incorporates NASA solar and meteorological data for the exact Lat/Long coordinates, to determine the ideal tilt angle of a solar panel that will yield maximum annual solar output. We calculate the optimal angle for each day of the year, taking into account its contribution to the yearly total PV potential at that specific location.

Seasonally adjusted solar panel tilt angles for Lahaina, United States

If you can adjust the tilt angle of your solar PV panels, please refer to the seasonal tilt angles below for optimal solar energy production in Lahaina, United States. As mentioned earlier, for fixed-panel solar PV installations, it is optimal to maintain a 18° South tilt angle throughout the year.

Overall Best Summer Angle	Overall Best Autumn Angle	Overall Best Winter Angle	Overall Best Spring Angle
5° South in Summer	26° South in Autumn	36° South in Winter	14° South in Spring

Our recommendations take into account more than just latitude and Earth's position in its elliptical orbit around the Sun. We also incorporate historical solar and meteorological data from NASA's Prediction of Worldwide Energy Resources (POWER) API to assign a weight to each ideal angle for each day based on its historical contribution to overall solar PV potential during a specific season.

This approach allows us to provide much more accurate recommendations than relying solely on latitude, as it considers unique weather conditions in different locations sharing the same latitude worldwide.

Calculate solar panel row spacing in Lahaina, United States

We've added a feature to calculate minimum solar panel row spacing by location. Enter your panel size and orientation below to get the minimum spacing in Lahaina, United States.

Our calculation method

1. Solar Position:
   We determine the Sun's position on the Winter solstice using the location's latitude and solar declination.
2. Shadow Projection:
   We calculate the shadow length cast by panels using trigonometry, considering panel tilt and the Sun's elevation angle.
3. Minimum Spacing:
   We add the shadow length to the horizontal space occupied by tilted panels.

This approach ensures maximum space efficiency while avoiding shading during critical times, as the Winter solstice represents the worst-case scenario for shadow length.

Topography for solar PV around Lahaina, United States

Lahaina is situated on the western coast of Maui, one of the Hawaiian Islands in the United States. The topography around Lahaina is characterized by a dramatic transition from coastal plains to steep volcanic slopes. The town itself sits on a relatively flat coastal strip, with the West Maui Mountains rising dramatically behind it. These mountains, formed from an extinct volcano known as Mauna Kahalawai, create a stunning backdrop to the coastal settlement. The immediate coastal area where Lahaina is located features a narrow strip of land that quickly gives way to increasingly steep terrain as one moves inland. The elevation rises rapidly from sea level to over 5,000 feet at the highest points of the West Maui Mountains, creating a variety of microclimates and ecological zones within a relatively short distance.

Coastal Plains and Lower Slopes

The coastal plains around Lahaina are generally flat to gently sloping, extending inland for approximately 1-2 miles before the terrain becomes noticeably steeper. This area was historically used for sugarcane cultivation but has transitioned to various uses including residential development, tourism infrastructure, and some agricultural activities. The soil in this region is generally fertile, derived from weathered volcanic material.

Mid-Elevation Slopes

As the land rises from the coastal plain, the slopes become increasingly steep. This intermediate zone, roughly between 500 and 2,000 feet elevation, features more pronounced ravines and ridges. Vegetation becomes denser in this zone, with more native Hawaiian plants appearing as the elevation increases. The terrain in this area is characterized by numerous gulches and valleys carved by erosion over thousands of years.

Upper Mountain Region

The higher elevations of the West Maui Mountains present extremely steep terrain, with some areas featuring near-vertical cliffs. The summit region includes Pu'u Kukui, the highest peak in the West Maui Mountains at 5,788 feet. This upper region receives significantly more rainfall than the coastal areas, creating a lush, cloud forest ecosystem. The topography here is rugged and largely inaccessible, with deep valleys and sharp ridges forming a complex mountain landscape.

Potential Areas for Solar PV Development

For large-scale solar photovoltaic (PV) development, the most suitable areas near Lahaina would be the lower elevation zones, particularly the former agricultural lands on the coastal plain and lower slopes. These areas offer several advantages for solar development: The coastal plain provides relatively flat terrain that would minimize grading and site preparation costs for solar installations. The gentle slopes in this area receive consistent sunshine, particularly important in a location that experiences excellent solar radiation throughout the year. Former sugarcane fields and other agricultural lands that have fallen out of production represent prime opportunities for solar development. These areas typically have existing access roads, are already cleared of natural vegetation, and may have some existing infrastructure that could support development. The lower western slopes facing the ocean also present good opportunities for solar PV installation. These west-facing slopes receive abundant afternoon sun exposure, which aligns well with peak electricity demand periods. Areas up to approximately 1,000 feet in elevation might be considered, though development becomes more challenging and expensive as the slope increases. Areas to avoid would include the steeper upper slopes and summit regions of the West Maui Mountains. These areas not only present significant construction challenges due to their steepness but also experience more cloud cover and rainfall, which would reduce solar generation efficiency. Additionally, these higher elevation zones contain more sensitive native ecosystems that would be disrupted by large-scale development. The areas south of Lahaina toward Olowalu and north toward Kaanapali also offer potential sites for solar development, as they share similar topographical characteristics with the immediate Lahaina area but may have more available land away from dense urban development.

United States solar PV Stats as a country

United States ranks 2nd in the world for cumulative solar PV capacity, with 95,209 total MW's of solar PV installed. This means that 3.40% of United States's total energy as a country comes from solar PV (that's 26th in the world). Each year United States is generating 289 Watts from solar PV per capita (United States ranks 15th in the world for solar PV Watts generated per capita). [source]

Are there incentives for businesses to install solar in United States?

Yes, there are several incentives for businesses wanting to install solar energy in the United States. These include federal tax credits, state and local rebates, net metering policies, and renewable energy certificates (RECs). Additionally, many states have enacted legislation that requires utilities to purchase a certain amount of electricity from renewable sources such as solar.

Do you have more up to date information than this on incentives towards solar PV projects in United States? Please reach out to us and help us keep this information current. Thanks!

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Compare this location to others worldwide for solar PV potential

The solar PV analyses available on our website, including this one, are offered as a free service to the global community. Our aim is to provide education and aid informed decision-making regarding solar PV installations.

However, please note that these analyses are general guidance and may not meet specific project requirements. For in-depth, tailored forecasts and analysis crucial for feasibility studies or when pursuing maximum ROI from your solar projects, feel free to contact us; we offer comprehensive consulting services expressly for this purpose.

Helping you assess viability of solar PV for your site

Calculate Your Optimal Solar Panel Tilt Angle: A Comprehensive Guide

Enhance your solar panel's performance with our in-depth guide. Determine the best tilt angle using hard data, debunk common misunderstandings, and gain insight into how your specific location affects solar energy production.