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Solar & Battery Strategy Optimizer

Guided Setup Auto-Save Ready

Follow the 4 simple input stages below to build your system and calculate your optimal Octopus Energy dispatch strategy.

Local-Only Privacy: Inputs stay 100% inside this browser (connect-src 'none', zero network telemetry). On a shared device, click Reset when finished.

New to Solar? Quick-Start with a Typical UK Home

Don't know all the technical numbers? Pick a standard home setup below — everything is pre-filled for you.

Looking for specific installer packages? (3.68kW to 8.0kW with 5.12kWh to 28.2kWh)

Step-by-Step Guided Setup Standard UK figures pre-filled

Solar Array 10 panels

Peak DC Size 4.65 kWp

Est. Annual Yield 5,754 kWh/yr

Battery Storage 9.4 kWh (8.9 kWh usable)

Est. Net Savings +£1,180/yr

Step 1 of 4 • Your Roof & Solar Panels Average UK settings ready

Where is your home & what solar panels can fit on your roof?

Don't worry if you don't know exact technical measurements — standard UK averages (10 panels, South-facing roof, 5 kW inverter) are already set for you below.

Where is your home located? (UK Region)

Sunlight varies slightly across the UK. Select your nearest area to get accurate local sunshine figures.

1,080 kWh/kWp

Select your installation region:

Your Roof Facing Direction & Number of Panels

Tell us which way your roof faces and how many panels will fit. Have panels on multiple roof faces (e.g. front & back)? Click + Add Another Roof Section.

Hybrid Inverter Size (Converts solar for home use)

5.0 kW is standard and recommended for most UK homes — you rarely need to change this.

kW AC

Quick Select Inverter Size:

1 Roof configured! Next step: choose your home battery size.

Step 2 of 4 • Home Battery Storage Optional but recommended for maximum savings

Would you like a home battery to store cheap solar & night electricity?

Home batteries store free solar energy during the day, or charge with cheap overnight electricity (e.g. 7p/kWh on Octopus), powering your home when grid prices are highest.

Choose your Battery Size

Select a common UK battery size below, or choose 0 kWh if you only want solar panels without a battery.

kWh

Fine-tune battery size with slider: 0 to 30 kWh

0 (Solar Only) 5.12 kWh 9.4 kWh (Typical) 18.8 kWh 30 kWh

Battery Charge & Discharge Speed (kW)

How fast your battery can fill during cheap overnight rates or run heavy appliances. 3.6 kW to 5.0 kW is standard and recommended.

Step 2 of 4 • Next: Your home electricity bills

Step 3 of 4 • Household Electricity Usage Average UK home uses 3,800 kWh/yr

How much electricity does your household use?

Enter your current annual electricity usage from a recent bill so we can accurately calculate your Before vs After Solar savings.

Current Annual Electricity Consumption

Don't know your exact annual kWh? Pick a typical house size below, or check your annual energy statement.

kWh/yr

Quick House Size Presets:

Comparing savings against (Current Baseline):

Daily Electricity Usage Routine

When do people in your home use the most electricity?

Add Planned Heavy Appliances (Optional):

Electric Vehicle (EV Home Charger) Adds ~2,200 kWh/yr (~8,000 miles/yr of charging)

Air Source Heat Pump Adds ~3,500 kWh/yr seasonal home heating load

Total Projected Annual Demand: 3,800 kWh/yr

Step 3 of 4 • Next: Choose smart tariff & cost

Stage 5 • Your Tailored Strategy & Savings Report

Optimal Dispatch Strategy & Financial Analysis

1. Recommended Seasonal Strategy Plan Optimised month-by-month across all 12 calendar months

Baseline was £1,250/yr

Seasonal Month-by-Month Optimal Strategy Plan

Maximum economic return by selecting the best operating strategy for each month

Net Annual Savings +£985/yr

New Net Bill £265/yr

Loading tailored month-by-month strategy analysis...

Recommended Seasonal Inverter & Battery Schedule

Net Annual Savings £980 vs baseline

Self-Consumption 78% solar used on-site

Grid Independence 84% home met off-grid

Simple Payback 7.2 yrs breakeven time

Est. System Cost £8,950 inc 0% VAT

CO2 Displaced 0.8 tonnes saved / year

2. Before vs After Solar & Battery Installation

Direct annual bill comparison against your pre-solar baseline

+£985/yr saved

Before Solar (Baseline) Standard Price Cap

Annual Consumption: 3,800 kWh

Grid Import Dependency: 100% (3,800 kWh)

Solar Export Earnings: £0.00

Total Baseline Annual Bill: £1,126/yr

With Solar + Battery Optimal Strategy

Total Projected Demand: 3,800 kWh

New Grid Import: 720 kWh (-81%)

Grid Export Revenue: +£345/yr

New Net Annual Bill: £141/yr

3. Best Operating Strategy for Each Month (Jan – Dec)

Solar generation and heating/lighting demand shift dramatically across the UK seasons. Below is the highest-saving strategy for each individual month — click any month to inspect its 24-hour dispatch profile.

View Full 12-Month × 4-Strategy Net Bill & Savings Comparison Table Show table

Month	Baseline	1. Eco Self-Use	2. Balanced 50%	3. Peak Export	4. Full 100% Hold	Winning Strategy & Savings

4. Compare Seasonal Optimal Plan vs Fixed Year-Round Strategies

Keep the recommended Month-by-Month Optimal Plan active, or click any single strategy below to inspect how it performs if locked all year:

5. 24-Hour Half-Hourly Power Dispatch Simulation

Explore half-hourly power flows between Solar, Battery, Home, and Grid across the year

Season: June (Midsummer)

Solar Generation Home Demand Battery SoC % Grid Import Grid Export

6. 12-Month Seasonal Breakdown

Monthly solar generation vs consumption, import & export

Solar Yield Consumption Import Export

7. 25-Year Cumulative ROI & Payback

Includes 2.5% inflation, 0.35%/yr degradation & mid-life battery service

8. Top 10 Energy Tariffs Ranked for Your System (UK Market Comparison)

We simulated 26 leading UK tariffs across Octopus, E.ON Next, OVO, British Gas, EDF, ScottishPower, Good Energy and more. Here are the 10 highest-saving options for your setup:

Top 10 of 26 UK Tariffs

9. Technical Assumptions & Calculation Methodology

Review all hardware specifications, yield deratings, efficiency factors, and tariff simulation assumptions used in this report.

View Assumptions

1. Solar PV Modules & DC Power Optimisation

High-Efficiency N-Type ABC Cells (+4.5% Yield Gain) 23.8%+ module efficiency with 0% front-grid contact shading and superior diffuse light capture under typical UK overcast conditions. Ultra-low temperature coefficient of -0.26%/°C minimizes summer thermal degradation losses.
100% Full-Array DC Power Optimisers (+5.5% Base Yield Gain) Dedicated module-level Maximum Power Point Tracking (MPPT) fitted to every panel eliminates string-current bottlenecking caused by partial chimney, gable, or tree shading. Extends generation window during dawn and dusk.
Oblique Orientation Bonus (Up to +2.5%) On non-optimal orientations (e.g. East-West splits or steep pitches), module-level optimisers recover up to an additional +2.5% of energy by independently harvesting each roof aspect without cross-string voltage drag.
Long-Term Linear Module Degradation (0.35%/yr) Modeled with a premium 0.35% annual linear degradation rate over the 25-year financial evaluation horizon, retaining over 91.2% of original generation capacity at Year 25.

2. Hybrid Inverter & DC Coupling Architecture

High-Efficiency Power Conversion (+2.0% Yield Boost) 97.6% maximum Euro-efficiency with 99.9% MPPT accuracy and ultra-low 50V start-up threshold, allowing early morning and late evening solar capture.
200% DC Array Oversizing Direct to Battery Hybrid inverter supports up to 200% DC array oversizing. Midday solar generation exceeding the AC grid power rating charges the DC-coupled battery directly on the DC bus before inverter clipping occurs.
Combined Base Yield Multiplier (1.1245× / +12.45%) The compounding combination of N-Type ABC cells (1.045×), 100% DC optimisers (1.055×), and high-efficiency inverter conversion (1.020×) yields a combined 1.1245× multiplier over standard legacy UK PVGIS baselines.
Grid AC Power Rating Limits Export and maximum continuous AC output are capped at the inverter rating (e.g. 3.68 kW for G98 fast-track domestic connection, 5.0 kW to 8.0 kW with G99 DNO approval).

3. Battery Storage & Round-Trip Efficiency

LFP Chemistry & 95% Depth of Discharge (DoD) Lithium Iron Phosphate (LiFePO4) chemistry operating with 95% usable DoD (reserving a 5% minimum State of Charge safety buffer for cell preservation and emergency standby).
94.5% DC-Coupled Round-Trip Efficiency Direct DC-to-DC solar charging into battery operates at 98% efficiency; battery discharge through inverter operates at 96.5% efficiency, yielding a 94.5% net DC-coupled round-trip efficiency.
Arbitrage Discharge Floor (20% SoC Reserve) During smart peak export arbitrage windows (16:00–19:00), forced grid discharge stops at 20% SoC to reserve the remaining 20% → 5% capacity to power household evening loads.
Cycle Life & Mid-Life Maintenance Allowance Rated for 6,000–8,000+ operational cycles. Financial ROI models include a £1,600 mid-life inverter/battery maintenance allowance at Year 15.

4. UK Regional Climate & Irradiance Modeling

MCS 003 & PVGIS Regional Insolation Datasets 13 UK regional climate zones with baseline annual yields ranging from 770 kWh/kWp in Northern Scotland to 1,080 kWh/kWp in the South West (scaling to 865–1,215 kWh/kWp with modern hardware).
MCS Pitch & Orientation Derating Matrix Continuous 2D bilinear interpolation across azimuth (0° North to 180° South to 360°) and roof pitch (0° flat to 90° vertical) applied per individual string.
12-Month Seasonal Insolation Curve Monthly solar generation weights model realistic UK seasons: Midsummer (June) produces ~15.1% of annual generation, whereas Midwinter (December) produces ~1.4%.
Seasonal Household Demand Variations Household electricity consumption dynamically varies from 80% of baseline in summer up to 125% in winter to reflect seasonal lighting, electronics, and heating loads.

5. 48-Slot Half-Hourly Simulation & Tariff Optimization

Half-Hourly Dispatch Simulation (48 Slots/Day) Simulates power flows across 48 discrete half-hour intervals for every representative calendar month, accounting for state of charge, charge rates, solar generation, and load curves.
Monthly Optimal Strategy Selection Independently evaluates 4 operating modes (Eco Self-Consumption, Balanced 50% Top-Up, Peak Export Arbitrage, and Full Charge & Hold) to identify the highest-saving strategy for each month.
26 UK Smart & Solar Export Tariff Models Half-hourly import and export schedules modeled for 26 leading UK tariffs across Octopus Energy, E.ON Next, OVO Energy, British Gas, EDF Energy, ScottishPower, Good Energy, Fuse Energy, So Energy, 100Green, and Utilita.
Baseline & Financial Cash Flow Modeling Direct before-vs-after comparison against Ofgem default price cap (or user benchmark). 25-year ROI incorporates 2.5% compound annual energy inflation, turnkey MCS pricing, 0% VAT on renewables, and 0.193 kg CO2e/kWh carbon displacement factor.

Engineering the Cloud Future

Azure Native

CI/CD & DevOps

Security First

Resume your Solar & Battery setup where you left off

Solar & Battery Strategy Optimizer

Solar & Battery Strategy Optimizer

New to Solar? Quick-Start with a Typical UK Home

Where is your home & what solar panels can fit on your roof?

Where is your home located? (UK Region)

Your Roof Facing Direction & Number of Panels

Hybrid Inverter Size (Converts solar for home use)

Would you like a home battery to store cheap solar & night electricity?

Choose your Battery Size

Battery Charge & Discharge Speed (kW)

How much electricity does your household use?

Current Annual Electricity Consumption

Daily Electricity Usage Routine

Which energy tariff & system quote are you modelling?

Choose your Energy Tariff (Octopus, E.ON Next, OVO, British Gas & more)

Estimated System Installation Cost

Optimal Dispatch Strategy & Financial Analysis

Seasonal Month-by-Month Optimal Strategy Plan

2. Before vs After Solar & Battery Installation

3. Best Operating Strategy for Each Month (Jan – Dec)

4. Compare Seasonal Optimal Plan vs Fixed Year-Round Strategies

5. 24-Hour Half-Hourly Power Dispatch Simulation

6. 12-Month Seasonal Breakdown

7. 25-Year Cumulative ROI & Payback

8. Top 10 Energy Tariffs Ranked for Your System (UK Market Comparison)

9. Technical Assumptions & Calculation Methodology

Admin Visitor Analytics

Engineering the Cloud Future

Azure Native

CI/CD & DevOps

Security First

Resume your Solar & Battery setup where you left off

Solar & Battery Strategy Optimizer

Solar & Battery Strategy Optimizer

New to Solar? Quick-Start with a Typical UK Home

Where is your home & what solar panels can fit on your roof?

1A Where is your home located? (UK Region)

1B Your Roof Facing Direction & Number of Panels

1C Hybrid Inverter Size (Converts solar for home use)

Would you like a home battery to store cheap solar & night electricity?

2A Choose your Battery Size

2B Battery Charge & Discharge Speed (kW)

How much electricity does your household use?

3A Current Annual Electricity Consumption

3B Daily Electricity Usage Routine

Which energy tariff & system quote are you modelling?

4A Choose your Energy Tariff (Octopus, E.ON Next, OVO, British Gas & more)

4B Estimated System Installation Cost

Optimal Dispatch Strategy & Financial Analysis

Seasonal Month-by-Month Optimal Strategy Plan

2. Before vs After Solar & Battery Installation

3. Best Operating Strategy for Each Month (Jan – Dec)

4. Compare Seasonal Optimal Plan vs Fixed Year-Round Strategies

5. 24-Hour Half-Hourly Power Dispatch Simulation

6. 12-Month Seasonal Breakdown

7. 25-Year Cumulative ROI & Payback

8. Top 10 Energy Tariffs Ranked for Your System (UK Market Comparison)

9. Technical Assumptions & Calculation Methodology

Admin Visitor Analytics

Where is your home located? (UK Region)

Your Roof Facing Direction & Number of Panels

Hybrid Inverter Size (Converts solar for home use)

Choose your Battery Size

Battery Charge & Discharge Speed (kW)

Current Annual Electricity Consumption

Daily Electricity Usage Routine

Choose your Energy Tariff (Octopus, E.ON Next, OVO, British Gas & more)

Estimated System Installation Cost