Charging e-bikes and e-scooters from solar in Perth

Electric bikes and e-scooters have small battery packs compared to electric cars — typically 0.25–1.0 kWh. Charging them from your home solar system is straightforward, and because their charging draw is low (100–250W), they fit easily into your solar surplus during the day.

The numbers: e-bike and e-scooter energy use

Typical e-bike battery:

• Commuter/cargo e-bike: 0.4–0.7 kWh (most common range)
• Mountain e-bike: 0.5–1.0 kWh
• Budget e-bike: 0.25–0.4 kWh

Typical e-scooter battery:

• Personal commuter scooter: 0.25–0.5 kWh
• Performance scooter: 0.5–1.5 kWh

Charging draw: Most e-bike and e-scooter chargers draw 150–300W from the wall. A full charge from empty takes 2–6 hours depending on battery size and charger output.

Cost of a full charge on grid:

• 0.5 kWh × 33.2621c/kWh (A1 tariff) = 16.6c per full charge
• In context: Perth petrol for an equivalent 10km commute costs approximately $1.50–$2.00

Even on the grid, e-bike charging is very cheap. Charged from solar, it's effectively free — the surplus generation that would otherwise export at DEBS 2c/kWh is instead powering your commute.

Charging strategy for maximum solar benefit

Plug in during solar generation hours: The simplest approach is to plug your e-bike or e-scooter into a standard GPO (power outlet) during the middle of the day (9am–3pm). If your home's solar is generating more than the base load, the charger draws from solar surplus rather than the grid.

Most people charge at home in the evening after returning from a commute — this is the least efficient time (drawing grid power after solar has stopped generating). Switching to daytime charging:

• If you're home during the day (working from home, weekend): plug in when you get home, then immediately move it to daytime charging the next day
• If you commute and return in the evening: plug in immediately, let it charge overnight, but consider leaving a partial charge for the next morning and completing it the following day from solar — this reduces grid draw slightly

Practical reality: Because e-bike charging costs under 20c per full charge regardless of grid vs solar, the financial optimisation is genuinely trivial. The more meaningful benefit is that e-bike charging has essentially zero impact on your solar self-consumption strategy — a 200W draw for 3 hours uses 0.6 kWh, well within normal solar surplus for any Perth system.

E-bikes and Midday Saver tariff

If you're on the Midday Saver tariff (8.8511c/kWh from 9am–3pm), e-bike charging during those hours costs:

• 0.5 kWh × 8.8511c = 4.4c per full charge

Even cheaper than standard A1. For households on Midday Saver, any daytime-pluggable device (e-bike, laptop, phone) is worth charging between 9am and 3pm regardless of solar.

What about charging from a portable power station?

If you don't own your home and can't access a rooftop solar system, a portable power station (see separate guide) with portable panels can charge an e-bike:

• A 200W portable panel in Perth generates ~700Wh/day in summer, ~400Wh/day in winter
• A 0.5 kWh e-bike battery needs 0.5 kWh ÷ 0.7 (charger efficiency) = ~0.7 kWh of solar input per full charge
• A 200W panel can charge a typical e-bike battery from empty in one sunny Perth day in summer

This is a viable setup for renters in a unit with a balcony or courtyard.

E-bike battery care in Perth's heat

E-bike lithium batteries (typically LFP or NMC chemistry, same as home batteries) are affected by Perth's summer heat:

• Don't charge in a hot car: Charging at temperatures above 40°C accelerates battery degradation. Perth summer cars quickly reach 60–80°C inside — don't leave your e-bike or its battery in a parked car and charge immediately on return.
• Storage in direct sun: Don't leave your e-bike in direct sun for extended periods. Store in shade or indoors.
• Optimal charge level for storage: If leaving the bike unused for more than a week, store the battery at 40–60% charge rather than fully charged or fully depleted — this extends battery cycle life.

These apply to e-scooter batteries equally.

Perth cycling infrastructure and solar charging

Perth has a growing cycling path network (Principal Shared Path network along Swan River, coastal paths, suburb connectors). The ability to charge an e-bike from home solar turns longer commutes (20–30km) into genuinely zero-cost, zero-emission journeys in Perth's flat metro geography.

For Perth households with existing solar, adding an e-bike or e-scooter requires no additional infrastructure beyond the standard GPO that any home already has. Unlike EV cars (which may require a dedicated EV charger), e-bikes and e-scooters charge from a standard 10A outlet.

E-bike electricity savings vs petrol

For a Perth commuter replacing a petrol car with an e-bike for a 15km daily commute:

• Petrol cost: ~$2.50/day (1.5L at $1.65/L)
• E-bike solar charging cost: ~$0.10/day (0.5 kWh at 20c/kWh grid, or near-zero from solar)
• Annual saving: ~$885/year

Combined with solar, the effective charging cost approaches zero — making the annual saving roughly equal to the full petrol cost ($912/year).

E-bike and e-scooter charging is one of the simplest solar self-consumption wins for Perth households — small draw (150–250W), flexible timing, and meaningful transport fuel savings. Plug in during solar hours for daytime commuters, or use standard overnight charging for evening commuters (the trivial cost makes it low-priority for optimisation compared to hot water and air conditioning).