— panels
Sized to your daily demand
YOUR LOCATION. YOUR LOAD. YOUR SYSTEM.
Prices in Kenyan shillingsMake room for solar.
Build a practical solar estimate, grounded in where you live and what you power.
Supplier snapshot · 03 Oct 2026
01
Your energy needs
Loading Nairobi climate…
Include only the appliances this solar system should power. Use nameplate watts; fridge hours mean compressor running hours.
Appliance / wattsQtyh/day
Use a meter reading or an energy audit, for the loads you want on solar.
Average monthly use ÷ 30 days. For amounts, deduct arrears and fixed fees first. KES 30 is an editable assumption, not a current KPLC tariff.
Required for energy/bill mode.
Total peak during motor start.
02
Make it fit your home
Reliability margins & installation costs
Plan for extra demand and battery recovery. These are adjustable design assumptions, not a blackout guarantee.
The array supplies daily demand plus enough surplus to refill the selected usable battery capacity over this period. Shorter recovery needs more panels.
NURU planning allowances: labour is the higher of the minimum charge or the kWp rate. Increase transport for distant sites, accommodation or difficult access. Replace these figures with an installer quotation when available.
Roof, losses & cable distances
Use a documented design value. Manual entry overrides climate data.
YOUR SOLAR BLUEPRINTNairobi
A brighter plan starts here.
Adjust your loads, then calculate a system for your location.
Daily solar load—kWh / day
Solar resource—peak sun hours / day
— kW
Pure sine wave with MPPT
— kWh
LiFePO₄ storage
Sun through the seasons
kWh/m²/dayLocation-specific monthly averages, not a daily weather forecast.
Electrical design checks
Calculate to check strings and voltage drop.
Historical supply stress test
Run every hour of 2025 weather at your coordinates against an assumed day/night load profile. Results show solar + battery shortfall before grid or generator support.
Editable bill-based assumption, not an official tariff. Savings exclude grid export and fixed bill charges.
Savings estimate appears after the historical test.
Not run. Monthly sizing does not prove year-round reliability.
Horizontal irradiance model; roof tilt, directional shading, battery ageing and measured hourly loads still need professional modelling. Temperature is modelled with a 45°C NOCT assumption and −0.30%/°C panel power coefficient. Uses a repeated-year warm-up and 80% usable battery window. Default load is uniform within the day and night periods.
Equipment estimate
SOURCED + ALLOWANCES| Component | Qty | Unit KES | Total KES |
|---|---|---|---|
| Calculate to see your component list. | |||
Planning budget—
Equipment + site works + contingencyNot a supplier quotation
Retail snapshot checked 03 Oct 2026. Prices and stock can change. Tax treatment follows each listing; confirm VAT, delivery, warranty and authenticity with suppliers.
TURN YOUR ESTIMATE INTO A PROJECT
Get your solar plan reviewed.
Use the free calculator to explore. Request professional support before you buy.
Design & quote review
From KES 2,500Review of your loads, proposed equipment and supplier quote. Final scope and fee confirmed before work begins.
Survey & installation plan
Quoted per locationRoof, shading, cable routes and protection requirements. Travel and site conditions determine the fee.
UNDERSTAND THE NUMBERS
Transparent by design.
This is a preliminary residential, single-phase sizing tool. The professional review fee is a NURU starting offer, separate from equipment costs; no order or payment is created by submitting an enquiry. An installer must confirm the roof, load profile and electrical design before procurement.
How sizing is calculated
Energy = watts × quantity × running hours ÷ 1,000. Panels round up to whole modules. The default load-growth headroom is 20%, applied to energy, continuous load and start-up surge. Default battery autonomy is one day. The array also supplies battery-recovery energy: selected battery usable AC kWh ÷ recovery days ÷ 0.95 recharge efficiency. PV kWp = (growth-adjusted daily solar kWh + battery-recovery energy) × (1 + array reserve) ÷ [solar resource × (1 − losses) × (1 − shading)]. The default additional array reserve is 25%; recovery is two sunny days. PV/system losses default to 15%, with temperature calculated separately using mean ambient temperature + 25°C as a preliminary cell-temperature assumption and −0.30%/°C power coefficient. The hourly test instead uses ambient temperature plus 0.025 × irradiance (W/m²). Monthly-average sun cannot establish a zero-outage guarantee. Inverter target = simultaneous kW × 1.25, with a separate start-up surge check. Battery nominal kWh = daily solar load × autonomy ÷ (0.8 depth of discharge × 0.92 inverter efficiency). Battery count also considers discharge power at 48 V and 100 A per module; supplier verification is required.
Climate data & accuracy
NASA POWER monthly climatology provides horizontal solar irradiation and mean temperature at your coordinates. It accounts for regional cloud and weather patterns, but does not resolve roof shading or exact tilted-plane yield. The lowest-sun month is the default sizing basis. Long-term averages do not guarantee supply through consecutive cloudy days. Off-grid systems need a reliability study and a backup strategy.
NASA POWER documentationMarket sources & installation checks
Panels, Deye alternatives and JA Solar prices: SolarShop / Voltwise. Felicity battery, inverter and accessory prices: Voltwise. Mounting, AC wiring, earth system and labour are explicitly marked as allowances. Installation labour defaults to the higher of KES 40,000 or KES 10,000/kWp; commissioning to KES 15,000; transport to KES 20,000. A 10% contingency is added to the entire subtotal. These are NURU budget assumptions, not verified nationwide market rates; edit them for the project. Suppliers quote site works separately after assessment. Cable quantities include positive and negative conductors plus 10% slack. Cable cross-sections, DC/AC protection ratings, earthing, string voltage at low temperature, MPPT current and BMS protocols require a qualified installer. No grid export or net-metering income is assumed.
Jinko 580 W listing · SolarShop catalogue · Voltwise component prices · Deye catalogue