Size.Solar

    370W Solar Panel Production in Pretoria

    A single 370W solar panel in Pretoria is estimated to generate approximately 634 kWh of electricity per year, averaging 1.74 kWh daily. This represents the actual AC power available for your home after system conversion losses.

    Solar Production Calculator
    Estimate solar production in Pretoria
    Adjust the controls to model annual output, monthly generation, and bill savings for a planned solar system.

    Current estimate

    Annual savings

    R23,176

    Use covered

    88%

    Start a roof project

    Your system settings

    370 W
    200WDefault: 370W700W
    panels
    1 panelTotal size: 3.70 kW150 panels
    kWh
    100 kWhTypical: 600 kWh5000 kWh
    14%
    5% (high efficiency)14% (standard)30%

    Annual bill savings

    R23,176

    Save about R1,931 per month, capped to the 600 kWh/month use you entered.

    Electricity use covered

    88%

    Produces an average of 528 kWh against 600 kWh of monthly use.

    Annual output

    6,338 kWh

    Daily output

    ~17 kWh

    System size

    3.7 kW

    Panels needed

    12 panels*

    Ready for a roof-specific design?

    Turn this production estimate into a full project with roof layout, batteries, equipment, and supplier options.

    Start a roof project

    Monthly production breakdown (kWh)

    Quote readinessThis estimate is strong enough for early planning. A supplier quote still needs roof space, shading, inverter limits, battery needs, and installation constraints.
    Planning notes* To cover 100% of your electricity use (600 kWh/month), we recommend about 12 panels rated at 370W each. Bill savings are capped at your entered use and do not assume export credits.

    Project-ready estimate

    Turn this result into a quote request

    Start with 12 panels at 370W, about 4.4 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.

    Start roof projectView supplier mapAdjust inputs
    Starter system
    ~4.4 kW

    12 panels for a 600 kWh/month home before roof, inverter, and battery constraints.

    Output per panel
    634 kWh

    Estimated annual AC electricity from one 370W panel after modelled system losses.

    Bill value/year
    R2,318

    Annual value at about ZAR 3.66/kWh, capped to the electricity use you can actually offset.

    Weakest month
    Dec

    48 kWh from one 370W 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
    Aug

    60 kWh from one 370W panel

    Lowest month
    Dec

    48 kWh from one 370W panel

    Solar resource
    6.3 kWh/m²/day

    2287 kWh/m² annual irradiance

    Model checks
    19.6%

    Capacity factor, 27.7% performance ratio, 664 kWh DC before conversion

    JulAugSepOctNovDecJanFebMarAprMayJun
    56 kWh60 kWh58 kWh58 kWh52 kWh48 kWh49 kWh48 kWh51 kWh50 kWh52 kWh52 kWh

    Model basis

    The model uses north-facing panels at 26° tilt, true north orientation, and 14% system loss. Typical 600 kWh/month electricity costs are R1,038 - R3,912 (typically R2,194) using 2024-2025 cost data.

    Solar production data provided by the PVWatts® API from NLR.

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