Step 1 · Sunrise
Build your daily load
Add what you run — or start from your electricity bill.
| Appliance |
Watts |
Qty |
Hrs/day |
Backup |
kWh/day |
|
Total energy per day
0.0 kWh
Peak (connected) load
0 W
Step 2 · Morning
Size your solar panels
Sun hours vary by location. Pick your region, then choose a panel size.
Panels up to ~795 W ship today; enter whatever your datasheet says.
Covers wiring, heat, dust and inverter losses. 20% is a safe default.
Panels needed
0
Array size
0.0 kW
Roof area needed
0 m²
≈ 0 sq ft
⚡ Units generatedkWh from your sunlight
Per panel / day0.0 units
Whole array / day0.0 units
Per month0 units
Step 3 · Noon
Size your battery bank
The part most calculators skip: the same backup, compared across four battery chemistries.
Tubular ladders run 110–260 Ah; lithium cells now reach 314 Ah and beyond.
Battery should cover:
Sizes on the appliances you ticked “Backup” in Step 1 — how real grid-backup systems are specified.
“Usable depth” is why lithium needs fewer batteries: lead-acid only safely gives ~50% of its rating, lithium 80–90%.
🔋 Units stored per battery12V × 200Ah
Rated capacity0.0 units
Usable (lead-acid)0.0 units
Usable (LiFePO4)0.0 units
Step 4 · Afternoon
Inverter & charge controller
The inverter must carry everything running at once; the controller must carry your full array.
25–35% suits mostly electronics, lights and light appliances.
Continuous load
0 W
everything running together
Surge peak (motor start)
0 W
worst-case startup spike
Recommended inverter
0.0 kVA
Charge controller (MPPT)
0 A
Step 5 · Sunset
Your complete system
Everything sized — with upfront and 10-year cost, side by side. Prices are editable for your local market.
Adjust prices & currency
Estimates for planning only. Real systems depend on shading, roof, wiring runs and local equipment. Confirm with a qualified installer before buying.