Size.Solar
300W Solar Panel Production in Montevideo
A single 300W solar panel in Montevideo is estimated to generate approximately 405 kWh of electricity per year, averaging 1.11 kWh daily. This is a temporary planning estimate while the PVWatts provider is unavailable.
PVWatts data is temporarily unavailable for this page.
The calculator below is using a conservative latitude-based seasonal estimate so you can keep planning. Use it for early sizing, then rerun the page before accepting a final supplier quote.
Your system settings
Annual bill savings
$68,243
Save about $5,687 per month, capped to the 600 kWh/month use you entered.
Electricity use covered
56%
Produces an average of 338 kWh against 600 kWh of monthly use.
Annual output
4,050 kWh
Daily output
~11 kWh
System size
3.0 kW
Panels needed
18 panels*
Ready for a roof-specific design?
Turn this production estimate into a full project with roof layout, batteries, equipment, and supplier options.
Monthly production breakdown (kWh)
Project-ready estimate
Turn this result into a quote request
Start with 18 panels at 300W, about 5.4 kW, a 600 kWh/month bill target, and 14% modelled system losses. This gives suppliers the first inputs they need before roof layout, inverter limits, and battery choices are refined.
- Starter system
- ~5.4 kW
- Output per panel
- 405 kWh
- Bill value/year
- $6,824
- Weakest month
- Jun
18 panels for a 600 kWh/month home before roof, inverter, and battery constraints.
Estimated annual AC electricity from one 300W panel after modelled system losses.
Annual value at about UYU 16.85/kWh, capped to the electricity use you can actually offset.
24 kWh from one 300W panel; check this month before sizing essential loads.
Roof fit
Confirm usable roof planes, shading, inverter limits, and battery needs before accepting a final layout.
Bill fit
Adjust panel count and monthly use above so savings are capped to electricity you can offset.
Quote check
Ask suppliers to show winter output, assumed losses, and any export-credit value separately.
Production evidenceShow monthly output and model assumptionsOpen this when checking winter production, irradiance, losses, or the source assumptions behind the quote handoff.
Monthly model
Monthly output and winter risk
The calculator is useful when it shows the weak months, not just a flattering annual number. Use the table to check whether winter output still supports the loads you care about.
- Best month
- Dec
- Lowest month
- Jun
- Solar resource
- 4.5 kWh/m²/day
- Model checks
- 15.4%
44 kWh from one 300W panel
24 kWh from one 300W panel
1646 kWh/m² annual irradiance
Capacity factor, 24.6% performance ratio, 440 kWh DC before conversion
| Jul | Aug | Sep | Oct | Nov | Dec | Jan | Feb | Mar | Apr | May | Jun |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 25 kWh | 29 kWh | 34 kWh | 38 kWh | 41 kWh | 44 kWh | 41 kWh | 38 kWh | 35 kWh | 31 kWh | 27 kWh | 24 kWh |
Model basis
The model uses north-facing panels at 35° tilt, true north orientation, and 14% system loss. Typical 600 kWh/month electricity costs are $5,300 - $12,000 (typically $10,110) using 2024-2025 cost data.
Provider-backed PVWatts data could not be loaded, so these monthly values use a latitude-based seasonal estimate until the provider is available again.