Solar Plus, Inc.

What Solar Plus, Inc. does

Solar Plus, Inc. is a family-owned solar electrical contracting company headquartered in Hanalei, Kauai, Hawaii, operating since 2002 across the Hawaiian Islands and California. The company designs and installs residential and commercial solar PV systems, battery storage, and electric vehicle charging infrastructure, with a specialization in zero-export / self-supply microgrid automation that combines PV, lithium iron phosphate (LFP) batteries, hybrid inverters, and optional propane backup generators to enable off-grid operation with the grid retained as a backup. The company is the first on Kauai to use this microgrid architecture with KIUC interconnection approval and serves as the authorized Sol-Ark inverter beta tester and repair service provider for the State of Hawaii, giving it early access to new inverter capabilities (12K, 15K, 30K, 60K product lines) and direct influence on product development for Kauai's grid environment.

The core product stack is built on Sol-Ark hybrid inverters, SimpliPHI, Pytes, and HomeGrid LFP batteries, and REC and Lumos solar panels, with the Sol-Ark Mega Ark 500kW+ containerized storage solution extending the company into larger commercial and community-scale work. Customer evidence includes nonprofit clients (Kauai Economic Opportunity, National Tropical Botanical Garden), government projects (Hale Opio solar carport for the State of Hawaii), and named residential installations (Kimolana Estate at 52.48 kWp PV / 190 kWh storage). Verified revenue mechanics include one-time project installation revenue, recurring O&M agreements with real-time monitoring, authorized Sol-Ark service revenue, and a financing referral partnership with American Savings Bank for Clean Energy Loans (5.069%+ APR, $1,500–$70,000). The company sells exclusively through direct, consultative field sales led by founder Doug Phillips, with no self-serve, marketplace, or reseller channels, and reaches customers through its website, Instagram, email capture, and word-of-mouth referrals.

Name

Solar Plus, Inc.

Legal name

Solar Plus Inc.

Website

https://solarpluskauai.com

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

1–10 employees

Short description

Solar Plus, Inc. is a family-owned solar electrical contracting company, founded in 2002 and headquartered in Hanalei, Kauai, that designs, installs, and services residential and commercial solar PV, battery storage, and zero-export microgrid systems for customers across the Hawaiian Islands and California.

Ownership category

akta.pro rank

Product category

Solar Energy Contracting and Microgrid Installation

NAICS

Solar Electric Power Generation (221114)

akta.pro primary industry

Solar EPC & Construction (Utility-Scale, Rooftop, Balance of System) (EUAMABAB)

akta.pro secondary industry

Owner’s Engineering, Grid Interconnection & System Studies (PVsyst/Performance Modeling, Protection Studies) (EUACAGAG)

Keywords

• Solar PV installation
• Microgrid systems
• Battery storage solutions
• Residential solar contractor
• Commercial solar contractor

Headquarters

HQ city

Hanalei

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

Personnel, Supply Chain, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Solar PV System Design and Installation: One-time installation revenue from custom solar PV system design, equipment supply, and installation for residential and commercial customers. Revenue is earned upfront at project completion (custom project-based pricing).
2. Microgrid and Battery Storage Systems: Sale and installation of battery energy storage systems (LFP batteries) and microgrid automation packages, sold as add-on to or independently from PV installations. Custom project pricing.
3. Operation & Maintenance (O&M) Agreements: Recurring revenue from O&M contracts covering program maintenance, software updates, panel cleaning, warranty management, and performance monitoring. Includes real-time monitoring via Sol-Ark inverter app. Custom plans tailored per project.
4. Solar Financing Referral (American Savings Bank): Referral partnership with American Savings Bank for 'Clean Energy Loans' to residential customers. While the loan is provided by ASB, Solar Plus drives the customer to financing, enabling higher transaction values and customer acquisition.
5. Sol-Ark Service and Repair (Hawaii): Solar Plus is the authorized service provider for Sol-Ark inverters in Hawaii, conducting beta testing and repair. This generates service revenue and deepens the technology partnership.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels5 records

Core offering

Solar Plus, Inc. designs, sells, and installs custom residential and commercial solar PV systems integrated with lithium iron phosphate battery storage and proprietary zero-export microgrid automation on Kauai, Hawaii and in California. The company delivers turnkey projects — site assessment, engineering, equipment supply, installation, commissioning, and ongoing Operation & Maintenance — that allow customers to operate off-grid while using the utility grid as backup, often eliminating reliance on net metering. Additional offerings include electric vehicle charger integration, hybrid heat pump water heaters, and authorized Sol-Ark inverter service and beta testing across the State of Hawaii.

Product overview

Solar Plus, Inc. offers a comprehensive portfolio of solar energy solutions centered around smart energy microgrids with automation. The core offering consists of residential and commercial solar PV systems, supplemented by specialized microgrid technology that combines PV, batteries, generators, and automation for off-grid capability with grid backup. Key product components include REC and Lumos solar panels, Sol-Ark inverters (15K residential and 60K-3P commercial), SimpliPHI and Pytes lithium iron phosphate batteries, and the Sol-Ark Mega Ark containerized storage solution. Additional offerings include electric vehicle integration, smart home automation, hybrid heat pump water heaters, and operation & maintenance services. The company positions itself as the first on Kauai to implement zero-export automation technology using cutting-edge lithium iron phosphate batteries.

Differentiator

Problem solved

Functional benefit

Products and services

• Commercial Solar PV Systems Custom commercial photovoltaic (PV) solutions designed to reduce operating costs and provide long-term energy control for businesses, including custom design, installation, and ongoing maintenance.
• Residential Solar PV Systems Complete home solar design and installation services covering all solar-related systems with a focus on efficiency, sustainability, and cost-effectiveness, including smart home integration.
• Smart Energy Microgrids Hybrid solar systems utilizing PV, batteries, generators, and automation to provide off-grid capability with grid backup. Features zero-export automation that allows customers to prioritize energy use and control how energy flows through the microgrid.
• Electric Vehicle Integration

Quantifiable outcome

• Electricity bills reduced by ~75% (from pre-solar to post-solar bills described as 'about one-quarter of what they were prior')
• +5 more outcomes

Named customers8 records

Segments3 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

Four partnerships are on record, tiered flagship / core, core and minor.

• Sol-Arkflagship / coreTechnology or IntegrationSol-Ark is Solar Plus's primary inverter technology partner. Solar Plus was an early adopter (found Sol-Ark at Solar Power International 6 years prior to the source date) and now serves as the authorized beta tester and repair service provider for Sol-Ark inverters in the State of Hawaii. Solar Plus provides direct product feedback that drives new features and functionality. Sol-Ark has developed commercial-scale inverters (15kW, 30kW, 60kW) that Solar Plus uses in commercial projects. Sol-Ark's hybrid inverters enable Solar Plus's zero-export self-supply microgrid model — a technology the company claims is unique on Kauai.
• SimpliPHIcoreTechnology or IntegrationSimpliPHI is a battery technology partner. Their SimpliPHI 6.6 Battery (LFP, 100Ah per unit, stackable) is featured in Solar Plus residential and commercial projects. SimpliPHI batteries are outdoor-rated, have rapid installation (RapidStak connector), and carry a 10-year warranty with >75% capacity guarantee. SimpliPHI appears in Solar Plus's 'Our Trusted Partners' logo section on the homepage.
• REC GroupcoreTechnology or IntegrationREC Group (Norwegian solar panel manufacturer founded 1996) is Solar Plus's primary solar panel partner. REC Alpha Pure R Series panels (430W, 60-cell) are used in projects, featuring 25-year performance warranty. REC is the only solar brand to have won three Intersolar Awards. REC panels are specified for their high efficiency and extended warranty, particularly in projects like the Kimolana Estate where space and corrosion resistance matter.
• Oahu Agriculture and Conservation AssociationminorImplementation/ SI/ Consulting PartnerReferenced in the context of USDA REAP grant assistance. Solar Plus recommends that commercial customers contact Oahu ACA for help writing REAP grant applications (which can cover up to 50% of project cost for agricultural producers and rural small businesses). This is an indirect partnership — Solar Plus directs customers to Oahu ACA for grant writing support.

Scale indicators6 records

Recent moves6 records

Expansion highlights6 records

Direct peers

• RevoluSun: Hawaii-based solar PV installer with residential and commercial focus. Directly comparable as a regional competitor in the Hawaii solar market targeting similar high electricity rate customers with similar installation-based business models.
• Hawaii Energy Connection: Hawaii-based solar installer serving residential and commercial customers across the islands with PV and battery storage. Directly comparable as a regional Hawaii solar EPC competing for the same customers as Solar Plus with overlapping service offerings.

Broad incumbents

• Tesla Energy: National solar (Solar Roof, Solar Panels) and energy storage (Powerwall) provider with active Hawaii operations. Comparable as a broad incumbent offering integrated solar+storage solutions similar to Solar Plus's microgrid approach, though at vastly larger scale.
• Sunrun: Largest US residential solar installer with established Hawaii operations and Brightbox battery offering. Comparable as a national residential solar+battery provider with an overlapping customer base and similar integrated product offerings, though operating at much larger scale.
• Schneider Electric: Global energy management and automation company with microgrid solutions (EcoStruxure Microgrid). Comparable as a broader incumbent in the microgrid and distributed energy space that competes in adjacent commercial and utility segments.

Others

• Enphase Energy: Leading microinverter and home energy storage (IQ Battery) manufacturer. Comparable as an upstream technology vendor whose products (Enphase IQ8 + IQ Battery) compete with the Sol-Ark + SimpliPHI stack that Solar Plus integrates in residential installations.
• Sol-Ark: Texas-based hybrid inverter manufacturer whose products power Solar Plus's microgrid solutions. Comparable as the upstream technology partner whose products are increasingly sold direct via Sol-Ark Owner's Box, partially bypassing traditional installers like Solar Plus.
• Generac: Major US energy equipment manufacturer with PWRcell battery storage and home standby generators. Comparable as an ecosystem vendor whose battery products compete with the SimpliPHI and Pytes storage that Solar Plus integrates into its microgrid solutions.
• SolarEdge: Global solar inverter and energy storage manufacturer. Comparable as an upstream ecosystem vendor whose inverter + storage products (SolarEdge Energy Bank) compete with the Sol-Ark-based stack Solar Plus integrates in residential and commercial installations.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Instagraminstagram.com/solarpluskauai
• Facebookfacebook.com/solarpluskauai
• LinkedInlinkedin.com/company/solar-plus-inc

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Solar Plus, Inc.