Stop quoting hardware. Start selling proof of savings.
EnergyOn Sim simulates your customer's site through a full South African year — hour by hour, with real Eskom & municipal tariffs, load shedding and diesel costs — then turns it into bankable IRR, payback and a branded proposal in minutes.
Hover a screen to take a closer lookSwipe to explore the screens
Built for South African installers, EPCs and energy consultants.
Excel can't model a real SA year.
Eskom tariffs rose 12.74% in 2025/26 and another 8.76% in 2026/27. Customers want proof before they spend — and averages, guesses and generic tools can't give it to them.
Averages hide the truth
Annual averages miss the hour-by-hour TOU rates and dispatch decisions that decide the real saving.
Four models, four spreadsheets
Cash, Rent-to-Own, Lease and PPA — each rebuilt by hand, every time, with errors nobody catches.
No load shedding, no diesel
Spreadsheets and overseas tools ignore outages and generator running costs — the two questions every SA customer asks first.
Hours per quote
On R150k–R10m deals, every slow quote is pipeline you're handing to a faster competitor.
From site data to signed deal in three steps.
Load the site
No logger data? Pick the closest demand curve — office, retail, school, cold storage and more — and enter the monthly kWh off the bills; we build the 8,760-hour profile for you. Or import a logger CSV if you have one. Then pick the tariff from the built-in Eskom library (or add a municipal one) and set the load shedding stage. The current bill is reconstructed line-for-line so the customer can verify it.
Model the options
Add PV, battery and generator components to as many designs as you like — every save re-simulates the full year automatically. Compare designs side-by-side, or let the optimiser search hundreds of configurations for you.
Send the proof
Generate a branded, editable proposal report — savings, payback, cash flow, load shedding cover and financing options — and export it to PDF with your logo and colours. The numbers close the deal for you.
Everything you need to size, prove and sell a system.
A full-year simulation engine — not a calculator
Every design runs through all 8,760 hours of a South African year: PV first, then battery, grid and generator, with each hour's state of charge carried into the next. Results update in about a second, every time you save.
- ✓Priority dispatch: PV → battery → grid → generator, with peak shaving and load shifting
- ✓AC- and DC-coupled batteries with correct efficiency chains, backup reserve and inverter limits
- ✓Diesel generators with fuel curves, start/stop logic and service costs
- ✓Imports hourly yield from HelioScope or any CSV — keep the design tool you already use
Real SA tariffs — verified against the actual bill
291 real Eskom 2026/27 tariffs ship in the library — Ruraflex to Megaflex to Homeflex — every levy, kVA demand charge and fixed charge itemised, never blended. Reconstruct the customer's current bill line-for-line first; when it matches their invoice, your savings number is believed.
- ✓Eskom TOU, municipal block tariffs, kVA demand charges and SSEG export credits
- ✓Separate before/after tariffs per design — including switching to a better tariff
- ✓Escalation aligned to the April Eskom anniversary, blended correctly in year one
Load shedding and diesel, answered in the proposal
Stages 1–8 are built in from the NRS 048-9 rotation rules as real hour-by-hour outage schedules. Every design gets a Shield Score — the share of outage hours fully covered — and generator running costs are quantified, so cutting the customer's existing diesel spend counts as a saving.
- ✓Shield Score: "this system covers 100% of Stage 4 outage hours"
- ✓Backup reserve honoured day-to-day, full battery available during outages
- ✓Fuel litres, runtime hours and CO₂ — current setup vs proposed, side by side
Unlimited designs, measured against today
Model the customer's current setup as the baseline — existing generator and all — then compare PV-only, PV+battery, off-grid or anything else against it. Winners are called out at a glance; every metric is side-by-side.
- ✓Savings are baseline-relative — cutting existing diesel spend is credited
- ✓IRR, payback, NPV, cost of energy, grid reduction and Shield Score per design
- ✓Unlimited designs and re-runs inside a project — never metered
Bankable financials, in rand
IRR, NPV, payback, LCOE and LCOS — plus a blended LCOE across PV, battery and generator that no other tool reports. Present Cash, Rent-to-Own, Lease and PPA side by side with 20-year escalated cash flows and tax incentives like Section 12B.
- ✓Effective cost of energy per financing option — the customer's real R/kWh
- ✓LCOS charged from actual simulated dispatch, not assumptions
- ✓Degradation, battery replacement, diesel and O&M escalation all in the model
Proposals in your brand, ready in minutes
A complete customer document — savings, charts, load shedding cover, financing comparison, terms — generated from your results and templates. Set your three brand colours once; every page follows. Edit any section in the app before exporting the PDF.
- ✓Your logo, colours, company and banking details — white-label on all paid plans
- ✓Template library — full proposal, investor summary, technical detail, budgetary
- ✓Reports are frozen snapshots — a re-simulation never changes an issued document
Test hundreds of system sizes. Sell the best one.
Sizing by hand, you try a handful of options — the odds the best system is among them are close to zero. The optimiser sweeps PV size, battery size, generator, grid capacity, tariff choice and dispatch strategy against the goal you pick: best IRR, fastest payback, lowest cost of energy, or fully off-grid.
- ✓Hundreds of full-year simulations in seconds — 484 configurations in 2.0s in the example shown
- ✓Twelve levers, eleven outcome targets, optional CAPEX budget cap
- ✓One click turns the winning result into a ready-to-quote design
Included on Professional and Business plans.
Independent, SA-deep, savings-first.
- ✗Annual averages, not hourly dispatch
- ✗No load shedding, no diesel costs
- ✗Hours per quote, errors nobody catches
- ✗No Eskom tariffs, load shedding or Section 12B
- ~Design-first — savings maths is an afterthought
- ~Biased to one catalogue, priced per seat in dollars
- ✓Hardware-neutral — best system, any supplier
- ✓SA-deep: Eskom tariffs, load shedding, diesel, 12B
- ✓Savings-first — proof that closes the deal
Design the best system for your customer — not the one a distributor wants to sell.
Priced on projects, not people.
A project = one customer you're quoting. Inside it, designs, simulations and optimisation runs are unlimited — never metered. Seats are included, so the whole team works without per-user fees.
- ✓1 active project
- ✓1 user
- ✓Full simulation engine
- ✓Reports (watermarked)
- —Optimisation
- ✓5 projects / month
- ✓2 users
- ✓White-label reports
- ✓Company library
- —Optimisation
- ✓10 projects / month
- ✓3 users
- ✓Optimisation included
- ✓Custom report templates
- ✓Company library
- ✓25 projects / month
- ✓5 users
- ✓Optimisation included
- ✓Custom report templates
- ✓Priority support
We'll design it for you.
Send us the site data and our team delivers a finished, optimally-sized, bankable design — in your brand, on the same platform. You stay focused on installing closed deals; many clients start here, then take over the tool themselves.
Frequently asked questions
Is the EnergyOn Sim Demo really free?
Yes. The Demo plan is free forever — no credit card, no time limit. You get the full simulation engine on one active project, so you can model a real site end-to-end. Reports carry an EnergyOn watermark; paid plans remove it and add more projects, users and features.
How accurate is the simulation?
EnergyOn Sim runs a sequential 8,760-hour simulation — every hour of the year, with each hour's battery state depending on the last. The dispatch engine is validated to within 0.01% of our real implemented projects reference models the platform was built from. Before you trust any savings number, the platform also reconstructs the customer's current electricity bill line-for-line so you can reconcile it against the actual utility invoice.
Which South African tariffs are built in?
The library ships with 291 real Eskom 2026/27 tariffs across nine books — including Ruraflex, Megaflex, Miniflex, Homeflex, Homepower, Businessrate and Landrate — every levy, demand charge and fixed charge itemised. Municipal and custom tariffs (flat, time-of-use or block) can be added and reused across projects, with separate before and after tariffs per design.
Does it model load shedding?
Yes. Load shedding stages 1–8 are generated from the NRS 048-9 rotation rules as full 8,760-hour outage schedules, and you can define custom outage patterns. Every design gets a Shield Score — the percentage of outage hours where demand is fully met — and the backup story appears in the customer proposal.
Can it model diesel generators and existing systems?
Yes — this is rare among solar software. Generators dispatch on state-of-charge with fuel curves, minimum runtimes and service costs. The customer's current setup (including an existing generator or PV system) is modelled as the baseline design, so proposals are credited for the diesel they eliminate — often a large, overlooked saving.
Is EnergyOn Sim a panel-layout or CAD design tool?
No — EnergyOn Sim is the savings-analysis and proposal layer. Design the array in the tool you already use (HelioScope, PVsyst or similar), then import the hourly yield CSV. EnergyOn Sim does the part those tools don't: South African tariff maths, load shedding, diesel, financing and the bankable numbers that close the deal.
Which financing options can I present?
Cash purchase, Rent-to-Own, Lease and PPA — side by side, each with year-by-year cash flow tables, deposits, escalation and tax incentives such as Section 12B. Every design also reports IRR, NPV, payback and the effective cost of energy per financing option.
How does pricing work?
Plans are metered on projects, not seats. A project is one customer site; inside it, designs, simulations and optimisation runs are unlimited. Seats are included with every plan (2 on Starter up to 5 on Business), so your whole team can work without per-user fees. The Demo plan is free forever, paid plans start at R1,950 per month, all prices include 15% VAT, and a 14-day Professional Demo is available after a short intro call.
Who is EnergyOn Sim for?
South African solar installers, EPCs and energy consultants who need to size, prove and quote PV, battery and generator systems. Office staff can produce bankable designs without tying up engineers — and business owners evaluating their own site can use the free Demo.
Is EnergyOn Sim tied to a hardware distributor?
No. EnergyOn Sim is independent and hardware-neutral. It optimises the system that is best for your customer — any brand, any supplier — not the one a distributor's catalogue wants to sell.
Model your first site — free.
The Demo plan gives you the full engine on a real project: build the demand profile from monthly bills (or import logger data), pick the tariff, simulate the year and see the savings. No credit card.