Preliminary Solar Designer

Shape a solar system around your energy needs.

Optimize your equipment, review live PVWatts simulation and battery state-of-charge, then lay out panels on your roof satellite imagery.

Step 1 of 3

System sizing & simulation

Fine-tune your solar capacity, inverter, and battery storage with live hour-by-hour simulation before physical roof placement.

Target Solar: 0.0 kW (0 panels)Daily use: 0 kWh

1. Select System Architecture Mode

All-in-One Storage

Integrated battery & inverter in a single unit. No separate inverter required.

Built-in inverter included

Inverter + Modular Battery

Separate hybrid solar inverter paired with expandable modular battery storage.

Customizable capacity

Solar Only (No Battery)

Grid-tied solar for maximum daytime bill reduction with standard grid fallback.

Lowest upfront cost

2. Solar Panel Model & Sizing

Solar Panel Model

Number of Panels: 0 panels (0.00 kW)

Target for ~0 kWh/dayRecommended: 1 panels (0.7 kW)

Solar InverterMatched to ~0.0 kW

Battery StorageModular Unit

40 kWh storage · 20 kW charge / 20 kW discharge · 90% round-trip efficiency.

⚡ Electrical Stringing & Inverter Compatibility Check⚠ Sizing Warning

Allocation: MPPT 1: 1 panels

Max String Voc (Cold)✓ Safe

39 V / 600 V limit

Worst-case cold morning open circuit voltage.

MPPT Voltage Range⚠ Outside

28V – 32V

Inverter MPPT window: 40V – 560V.

Short-Circuit Current✓ Safe

18.30 A / 26.0 A limit

Panel Isc vs Inverter MPPT input ceiling.

DC / AC Ratio✓ Optimal

22% (0.7 kW / 3.0 kW)

Optimal sizing for tropical morning/evening shoulder yield.

PVWatts & Zero-Export Battery Simulation

Model the energy flow hour by hour.

Solar serves your property load first, then charges the selected storage unit. Surplus is curtailed; grid export is zero.

Active Storage Configuration

Reference Battery 40 kWh (40 kWh)

20 kW charge · 20 kW discharge · 90% efficiency

Load profileDaily target (kWh)

Calculate production to see annual solar, grid import, battery dispatch, and customer economics.

Stage 1 economics

Customer economics & financing

Calculate production to model the current utility cost, residual grid cost, annual savings, cash position, and financing scenario from simulated grid imports.

Domestic · EasipayK0.7686/kWh before VAT · PNG Power Q2 2026 · customer totals include 10% VAT

Keep or discuss this preliminary design

Save, download or send this preliminary design to our PNG technical engineering team.