Home Battery Storage & Solar EV Charging: The Complete Guide for 2026

Solar panels generate electricity during daylight hours, but your home uses energy morning, evening, and night. This is where home battery storage transforms your solar investment from a daytime-only system into a round-the-clock energy solution.

Add electric vehicle charging into the mix, and you've got a complete energy ecosystem that can make you nearly energy-independent while driving down electricity bills by up to 70%.

Let's explore how these systems work together and why they make such a difference.

How Home Battery Storage Works

A home battery system stores excess solar electricity generated during the day for use when the sun isn't shining. Here's the flow:

1. Your solar panels generate electricity (morning to late afternoon)
2. Your home uses what it needs immediately
3. Excess electricity charges your battery instead of being exported to the grid (or exported later if the battery is full)
4. When the sun sets, your battery supplies electricity to power your home
5. If the battery empties, you draw from the grid (or from your EV, if vehicle-to-home is supported)

A typical home battery ranges from 5kWh to 15kWh. A 10kWh battery stores roughly one day of typical household energy use—enough to cover evening and night consumption for most homes.

Real Savings: With vs Without Battery

The numbers tell the story.

Solar Alone (No Battery)

• Annual energy bill savings: £400-£600
• Self-consumption rate: 30-40% (much of your solar goes to the grid)
• Payback period: 15-20 years

Solar + Battery Storage

• Annual energy bill savings: £1,200-£1,800
• Self-consumption rate: 70-85% (you use most of your solar generation)
• Payback period: 10-14 years (battery adds cost but dramatically improves returns)
• Added benefit: Energy independence during power cuts

The difference is significant. Battery storage triples your annual savings because you're no longer exporting cheap electricity to the grid—you're using it yourself at peak rates.

Smart Tariffs: The Battery Game-Changer

Smart electricity tariffs have revolutionised battery economics. Companies like Octopus Energy offer rates that vary by hour.

Octopus Go (Popular Example)

• Off-peak rate: ~7p per kWh (midnight to 5am)
• Peak rate: ~30p per kWh (rest of day)

With a smart battery system, you can:

• Charge your battery during off-peak hours (cheap night rates)
• Use that battery during peak hours instead of buying expensive grid electricity
• Keep your solar generation for daytime use or export

This arbitrage alone (buying cheap, using expensive) can save £300-£500 per year, on top of your solar savings.

Solar-Priority EV Charging

If you own an electric vehicle, integrating it with your solar carport creates an elegant energy loop.

Standard EV Charging

Plug in your EV any time, and it charges from the grid (or slowly from solar if directly connected). You're paying grid rates (typically 25-30p/kWh).

Solar-Priority Charging

Smart systems can schedule EV charging to prioritise your solar generation:

• Sunny day? Charge your EV directly from solar (free energy)
• Cloudy afternoon? Hold off charging until your battery has surplus
• Evening? Charge during off-peak hours if on a smart tariff
• Battery low? Minimal grid charging

The result: EV charging costs drop from £0.06-£0.10 per mile (grid charging) to £0.01-£0.03 per mile (solar + smart tariff).

Real Example

A typical EV with a 60kWh battery costs:

• Grid charging (30p/kWh): £18 per full charge (200 miles)
• Solar + battery + smart tariff: £3-£5 per full charge
• Annual saving (10,000 miles): £2,000-£2,500

That's the power of integration.

Battery Storage Technologies

At Oak Frame Solar, we integrate leading battery systems. Each has different strengths:

GivEnergy 9.5kWh

Affordable, reliable, good for standard households. Smart controls available for time-based charging.

MyEnergi Libbi 5kWh

Excellent smart tariff integration. Designed specifically to work with smart grids and time-based rates. Smaller capacity but intelligent.

SolarEdge Home Battery 10kWh

Premium option. Integrated inverter/battery, excellent app, vehicle-to-home ready. Best for advanced users wanting maximum control.

All are paired with our solar systems and integrated into your oak frame carport's electrical architecture.

EV Charging Hardware

Standard charger options for a solar carport:

• 7kW wallbox: 30-40 miles range per hour of charging. Standard home charging speed
• 11kW wallbox: 40-50 miles per hour. Faster charging, requires upgraded electrics
• Smart controllers: Enable solar-priority and tariff-based scheduling

Most of our customers choose a 7kW charger with smart controls. It's fast enough for daily commuting and integrates perfectly with solar + battery systems.

System Integration in Your Carport

Here's how everything connects in an Oak Frame Solar installation:

1. Solar panels (roof): Generate electricity in daylight
2. Inverter (usually wall-mounted): Converts DC solar to AC household power
3. Battery (usually wall-mounted): Stores excess energy, discharges when needed
4. EV charger (carport wall or post): Connected to system, receives smart charging signals
5. Smart meter/monitoring: Tracks generation, consumption, battery status, charging

All managed by a single control system, often accessible from your phone. You can watch your solar generation, battery charge level, and EV charging in real-time.

Planning for Your System Size

How much solar and battery do you need?

• Annual electricity use: Check your last 12 months of bills. Average UK home: 3,000-4,000 kWh/year
• Solar size: A 4-6kW system (typical 2-3 bay carport) generates 3,200-4,800 kWh/year, covering most household use
• Battery size: A 9-10kWh battery stores one day's typical use, ideal for 2-3 person households
• EV charging: If you drive 10,000 miles/year, you need 3,000 kWh for EV + 2,500-3,000 kWh for home = 5,500-6,000 kWh total. A 6kW solar + 10kWh battery covers this comfortably

Our team sizes systems during the design phase based on your actual usage and location.

Why Carports Are Ideal for Integration

A solar carport is the perfect platform for battery + EV charging integration:

• Roof space: Integrated solar tiles cover the full roof area
• Location: Over your car, naturally near where you'd charge
• Electrical infrastructure: Easy to run wiring from panels down to carport wall for battery and charger
• Aesthetics: Everything stays tidy and integrated, no separate installations
• Turnkey: One team handles solar, battery, and EV charging as one system

A traditional roof solar system requires separate decisions on battery location and charger placement. A carport integrates everything naturally.

Monitoring & Control

Modern systems give you full visibility and control through mobile apps:

• Real-time generation, consumption, battery status
• Schedule EV charging by time or by solar availability
• Export data to track environmental impact
• Receive alerts if something needs attention

Most customers check their system once a week. After initial setup, it runs almost entirely automatically.