The right timing.
The full picture.

ONTARIO • 14 OCTOBER 2026

One cycle, with the losses included.

This illustration uses OEB Time-of-Use prices effective 1 November 2025, as listed on the OEB page when reviewed on 14 October 2026: off-peak 9.8¢/kWh and on-peak 20.3¢/kWh. It is a dated example, not a prediction of future rates. Check current OEB prices and time periods before making a decision.

Assume the battery delivers 10 kWh to eligible household loads during on-peak hours, with a hypothetical 90% AC round-trip efficiency. This efficiency is an illustration, not a manufacturer claim. Enough charging time, storage after backup reserve, inverter output and on-peak household demand must all be available.

Calculations use unrounded values; displayed figures are rounded. The $0.94 difference is for this single assumed cycle, not total bill savings, annual savings or investment payback.

When shifting makes the result worse.

If those same 10 kWh replace electricity that would also cost 9.8¢/kWh, the avoided purchase is only $0.98. Charging still costs about $1.09: the energy-only result is about $0.11 more cost. Losses can outweigh a small or absent price spread.

What this leaves out.

This compares only the stated electricity prices. It excludes delivery and regulatory charges, taxes, rebates (including the Ontario Electricity Rebate), equipment, installation, financing, maintenance and battery degradation. Additional standby consumption beyond the assumed efficiency is also excluded. Actual whole-bill results and ownership costs require a separate assessment.

Outside Ontario, use your own utility plan. Even within Ontario, a retailer contract or a different rate plan changes the calculation.

Can a battery lower electricity costs?

It may help where a suitable time-of-use plan charges less during some hours and more during others. The battery can charge during lower-rate periods and supply stored energy later. This is often called energy shifting.

A rate difference alone is not proof of savings. Your home must have enough suitable usage to shift, the system must support that operation, and the benefit must be considered alongside losses and equipment costs.

Start with your actual electricity plan.

Ontario’s Time-of-Use and Ultra-Low Overnight plans vary prices by time. Tiered pricing depends on monthly consumption rather than the hour of use. An electricity retailer contract may use different pricing again.

Check your current bill and utility’s plan information. A low overnight price can be paired with a higher peak price, so compare the effect on your whole household’s pattern rather than one rate in isolation. See the Ontario Energy Board’s current electricity-rate information.

Outside Ontario, the same timing opportunity may not exist. Provincial, utility and customer-specific plans differ. Ask the team to review the local plan before applying an Ontario example to your home.

Stored energy is not returned without losses.

Charging, storage and conversion use some electricity. Round-trip efficiency describes how much energy is retrieved relative to what went into storage. It is not the same as an inverter’s peak efficiency figure.

The relevant performance is for the complete proposed system and operating conditions. Do not substitute a global product headline or a utility-scale benchmark for your home’s expected result.

Available capacity and power also limit how much demand can be shifted. A battery reserved for backup may have less energy available for daily cycling. Read the difference between kW and kWh before comparing proposals.

Energy-charge savings are not total bill savings.

A household electricity bill can include more than energy consumed at a time-based rate. Delivery, fixed charges, taxes and other items may respond differently or remain payable. A battery does not simply remove the entire bill.

A purchase decision also needs a written equipment and installation price, any site work, operating assumptions and the relevant warranty terms. A savings illustration is not a quote, financing offer or guaranteed payback period.

Consider backup resilience and electricity-cost goals separately. Both may matter to you, but they are different reasons to choose a system.

Use an estimate as a starting point.

The Quick Savings Estimate uses Ontario-rate assumptions. It is illustrative, not a nationwide prediction or a personalised engineering assessment. Review its assumptions before relying on the result.

For a more useful conversation, bring a recent bill, your rate-plan name, usage history if available, and major electrical loads or planned changes. Do not assume floor area alone describes how your home uses electricity.

The bill scanner is an optional starting tool. Review its data notice before uploading. A specialist should resolve uncertain inputs and local rates.