Compare annual EV energy offset with direct solar charging windows, review actual tariff and circuit limits, then retain measured charging results.
Record driving distance, battery-side energy consumption, actual AC-to-battery charging efficiency and the hours the vehicle is connected. Keep vehicle AC acceptance, configured EVSE power and the site electrical limit as distinct constraints. Decide whether the objective is annual energy offset or direct daytime solar use.
Use a site model or measured AC production profile with orientation, shading, weather and inverter assumptions recorded. For a module operating-point estimate, distinguish irradiance and cell temperature from an integrated yield. Record available array area and actual module ratings for the design team.
Calculate the DC nameplate needed for annual EV energy using the site’s annual AC yield. Then use chronological PV and household-load intervals to compare solar-only modulation with grid-assisted charging. Include minimum stable charge power and stop at the intended battery-energy target.
Value self-used solar and exported energy under the current utility tariff, including credit usability and additional charges. Coordinate the actual PV, inverter, EVSE, metering, permits and interconnection with the project team. Review service demand and the configured EV circuit before equipment selection is finalized.
Have the completed installation commissioned under the equipment and utility requirements. Verify configured current, meter direction, controller compatibility and charging behavior through changing solar conditions. Compare measured PV AC energy, household use, EV AC input and battery energy over the same time window.
Export the accepted charging settings, actual tariff version, interval assumptions and measured results. Record whether grid assistance is enabled and what happens when the target cannot be met. Compare later seasons, changed driving patterns or tariff revisions using separate saved cases.
Separate annual driving energy from interval solar-charging availability. · Compare annual offset, solar contribution, EV grid energy and unmet charging target. · Replace planning intervals with measured charging and production observations. · Save measured solar-only and grid-assisted cases with the same energy target.
Estimate the accepted charging window using actual vehicle and EVSE limits. · Check configured AC current against the reviewed circuit limits.
Check instantaneous operating conditions or integrate AC output intervals. · Reconcile measured AC interval energy over the same commissioning window.
Retain a transparent nameplate and peak-sun-hour arithmetic case where that simplified basis is appropriate.
Compare self-use and realizable export value at the applicable time-band rates. · Retain dated tariff and credit assumptions for the next comparison.
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An instantaneous module model and an annual site-energy simulation answer different questions.
Verify local utility eligibility, rates and credit design when valuing exported solar.
PV, house and EV energy must cover the same timestamps to reconcile the energy balance.
A solar-only case that falls short is useful evidence for a schedule change or explicit grid-assist choice.