Solar system calculator
Recommended inverter size:
Recommended battery size:
Recommended PV array:
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Disclaimer:
This calculator provides an estimated solar system size based solely on the user’s monthly electricity bill, selected tariff, phase type, and estimated night-time usage. Actual system requirements may vary depending on load profile, appliance types, peak demand, wiring layout, roof orientation, shading, seasonal variation, municipal supply limitations, and other site-specific conditions.
All results are for preliminary guidance only and do not constitute a formal design, engineering analysis, or installation quotation. Deltool recommends an on-site assessment and detailed load study before any purchasing or installation decision is made.
Explore our Solar products
Deltool brings you a complete range of trusted solar solutions — Tier-1 solar panels, reliable inverters, long-life batteries, and all the installation accessories needed for a clean, safe and efficient system. When you buy from Deltool, you’re choosing top-quality products backed by solid warranties and real after-sales support.
You also get direct access to guidance from a seasoned installer, backed by Herholdt’s premium partnership and AREP membership, ensuring your system is designed and installed to industry-leading standards.
Pro-Design
Custom Solar Energy Design & Proposal
Deltool delivers precise, data-driven solar designs that remove guesswork and set clear expectations. Using your site address, the past 12 months of electricity bills, and your current cost per kWh, we create a custom OpenSolar design tailored to your roof, location, and real energy usage. Each proposal includes system performance forecasts, long-term savings, environmental impact metrics, detailed equipment specifications, and a transparent cost breakdown with realistic return-on-investment projections.
A small proposal fee applies, which is fully credited back when you proceed with Deltool—whether you choose a DIY supply option or a complete turnkey installation. Contact Deltool to start with a professional solar design built for confident decision-making.
Pro-Analyze
Energy Logging & Load Profiling Service
Deltool’s Energy Logging Service provides accurate, real-world insight into how your electricity is actually used. Using professional-grade energy metering equipment, we capture real-time consumption data to identify peak demand, load profiles, and power quality issues—critical inputs for correctly sizing a solar or backup power system and avoiding costly over- or under-design.
The service includes one week of energy meter rental, raw data export in .csv format, and clear Excel-based analysis with actionable insights. A logging fee of R2,500 per week is only payable if the client does not proceed with purchasing a system from Deltool. When Deltool supplies the system, the logging fee is waived. A refundable meter deposit of R8,000 applies. Installation and removal by a qualified electrician are optional and can be quoted separately.
Contact Deltool to ensure your system is sized correctly, based on facts—not assumptions.
Pro-Tender
Pro-Tender™ – Smart Tendering & Project Management
Pro-Tender™ is Deltool’s specialist tendering and project management service for solar and energy projects, designed to remove uncertainty, risk, and inefficiency from institutional procurement. Deltool structures clear, compliant, and technically sound tenders that accurately reflect the client’s real energy needs while aligning with regulatory and governance requirements.
From concept through commissioning, Deltool provides expert tender drafting and evaluation, objective contractor selection, project oversight, and guidance on financial models including rental, term, and ownership structures. When acting in a Pro-Tender™ role, Deltool remains fully independent from installation, ensuring impartial decision-making and outcomes that protect the client’s long-term interests.
Contact Deltool to discuss how Pro-Tender™ can de-risk and streamline your next energy project.
Pro-Service
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Turnkey Solar Solutions
Deltool delivers complete turnkey solar solutions through a network of trusted, Deltool-approved installer partners. From system design and premium equipment supply to installation oversight, commissioning, and final handover, Deltool manages the full technical journey to ensure a reliable, compliant, and high-performance solar system.
Beyond installation, Deltool’s Pro-Service offering supports the long-term performance and protection of your investment. This includes professional solar panel cleaning, installation of bird-proofing solutions, and the supply and installation of roof walkways to allow safe access for ongoing solar panel maintenance.
All work is executed under Deltool’s strict technical standards, with quality control, certification, and manufacturer warranty protection maintained throughout. Deltool remains your primary point of contact for system performance, service, and long-term value.
Contact Deltool to discuss a turnkey solar solution with ongoing Pro-Service support tailored to your site and energy needs.
