Plan wallboxes and EV charging in an offer

A wallbox changes the energy balance, not just the line-item total. The EV draws extra kWh, the solar covers part of that draw, and the customer's payback math shifts. Reonic treats the wallbox and EV pair as a load source in the self-consumption simulation, then prices the hardware into the bill of materials.

This guide covers planning a wallbox inside a residential offer. You need offer-editing rights and an editor role or higher. Viewers see the actions disabled.

Before you start

• Decide whether the wallbox is part of the same project as the PV install, or a standalone wallbox-only offer. Both work; the planning steps differ slightly.
• Know whether the customer already drives an EV or is planning one. Either way you can add a vehicle. Use a placeholder if they haven't decided yet (see step 3 of Add the customer's electric vehicle).
• For households with two cars, decide whether both will charge at home, and whether they'll ever charge at the same time. That drives wallbox sizing and load management.
• Check the household's available grid connection capacity (Hausanschluss). A 22 kW wallbox on a 35 A connection without load management trips the main fuse. Most German one-family homes need either a smaller wallbox or load shifting.
• The offer must be in draft to change wallbox hardware or pricing. Once a signature request is sent, that snapshot is locked. Withdraw it or wait for it to expire before editing.

Add a wallbox to the offer

1. Open the offer in the Portal and select the variant you want to modify.
2. Go to the Planning view and open the Wallbox section (or the dedicated Wallbox sub-step in the planning navigation).
3. Click Start planning (the wallbox add button).
4. Pick a wallbox model from your workspace's package library. Each entry carries the maximum charging power (for example 11 kW or 22 kW), the connection type (single-phase or three-phase), and the price.
5. Click Save. The wallbox is added as a line item. There is no charging-power field on this planned-add step — the wallbox's charging power comes from the catalog component you picked. To plan a different charging power, pick a catalog component rated at that power.

The wallbox now appears in the variant's bill of materials, and the total price recomputes immediately.

Pro tip: When the customer wants a future-proof 22 kW wallbox but their grid connection is borderline, plan the higher-power wallbox and a load-management module. The hardware can do 22 kW; the load manager keeps the house from tripping.

Add the customer's electric vehicle

The wallbox is a hardware line item; the EV consumption is a separate input the simulation uses. Adding the EV is what makes the profitability math reflect reality.

1. In the planning view, open the EV consumption (or Vehicle) section.
2. Click Add vehicle.
3. Choose the model from Reonic's curated vehicle database (pure EVs only — hybrids aren't listed). If the customer hasn't decided yet, pick a representative model as a placeholder. You can swap in the real model later without redoing the plan.
4. Enter the annual mileage the electric motor will cover. If you leave it blank, the field defaults to 20,000 km/year (minimum 2,000). As a rule of thumb, a second car used daily sits around 15,000 km/year, and a primary household car often at 20,000+ km/year.
5. Click Save.

Reonic derives the additional electricity consumption in kWh from model and mileage, feeds it into the total energy balance, and routes part of the EV demand to the wallbox in the self-consumption simulation.

Note: The EV consumption appears on the Annual energy costs page of the customer-facing offer as a dedicated Electric car row. This row shows once you have planned both a wallbox and a vehicle. Plan both so the simulation counts the customer's actual electricity bill.

Plan multiple wallboxes (two cars, multi-car households)

Reonic supports more than one wallbox in a single residential planning.

1. Add the first wallbox as above.
2. Click Start planning again.
3. Pick the second model (its charging power comes from the chosen catalog component).
4. Click Save.

If both cars charge at home at the same time, plan a load-management module (often offered by the wallbox manufacturer) or pick wallboxes that talk to each other natively. That keeps the cars from sharing the grid connection naively and throttling one of them.

Note: Modelling an EV fleet's consumption — a vehicle catalogue with per-vehicle weekly usage patterns — is a commercial capability. On a residential offer you add wallbox hardware line items and a single vehicle's charging; full fleet modelling lives in commercial planning, and the day-to-day charging schedule is handled in the wallbox manufacturer's own app.

Pro tip: For business projects, give each wallbox an explicit name (Wallbox 1 — Service van, Wallbox 2 — Director) so the bill of materials reads cleanly.

Size the wallbox for the household's grid connection

The most common cause of wallbox-planning regret is sizing the hardware higher than the grid connection supports. Sizing is the planner's call, so confirm it at offer time.

Rule of thumb for German one-family homes:

• 35 A grid connection (most common) — 11 kW wallbox is safe; 22 kW needs load management.
• 63 A grid connection — 22 kW wallbox is usually safe; still confirm with the electrician.
• Below 35 A — 7.4 kW single-phase wallbox, or upgrade the connection.

The customer's electrician (or your team's electrical sign-off) makes the final call. The offer reflects the plan, so catch a mismatch at offer time by asking about the Hausanschluss size.

Note: The wallbox's charging power is a property of the catalog component you pick, and its price comes from the same catalog entry. To plan a lower operating power (for example 7.4 kW instead of 11 kW), pick a catalog component rated at that power.

Add load management / overload protection

For households where the wallbox could trip the main fuse — most 22 kW installs and many 11 kW plus heat-pump combos — plan an overload-protection or energy-management module. Two ways:

1. As a wallbox accessory. Some wallbox brands sell their own load manager (KEBA, go-e, Wallbe). Add it as a line item in the wallbox section, alongside the main charger.
2. As a separate energy-management component. Brand-agnostic modules (SMA Sunny Home Manager, openWB controllers) sit in the Additional components section — see Plan additional components.

Either way, tell the customer's electrician what the planned load-management approach is. The hardware is necessary but not sufficient; the electrician wires it into the panel correctly.

Smart-charging and PV-surplus charging

Customers buying solar and a wallbox often ask whether the car will charge from the sun. The answer depends on the wallbox and the energy-management setup.

• PV-surplus charging — the car charges only when the solar produces more than the house needs. Requires a wallbox that talks to an energy manager (SMA, KEBA, openWB), or a wallbox with built-in PV-surplus mode.
• Time-of-use charging — the car charges only during cheap-tariff hours (night, dynamic tariffs). Some wallboxes support this natively; others rely on a smart-tariff manager.
• Manual / cable — the car charges whenever it's plugged in, at full configured power. The fallback for any wallbox.

Reonic's planning step records the hardware. The simulation builds a weekly charging profile for the EV and models smart-charging during low-tariff and excess-solar windows. When the customer plans to grid-charge at night exclusively, or to charge purely from solar, flag it to the install team so the wallbox and energy-manager combo matches the intended behaviour.

Pro tip: When a customer says they want to charge purely from solar, tag that explicitly in the offer notes so the install team knows which wallbox and energy-manager combo makes the surplus-charging path work.

Price the wallbox and apply discounts

The wallbox and its accessories are normal line items, so the full discount stack applies. There are three discount layers, applied in order:

1. Line-level rebate — select the wallbox line item and apply a rebate via the line-level discount control.
2. Option-level global rebate — apply a rebate across the whole option; it's stored at option level and applied after the line-item math.
3. Custom deal value — override the total with a fixed agreed price.

See Apply a global discount for the full pricing model.

Note: The per-component price column on the customer-facing Components Overview page shows the unrebated list price for each component, including the wallbox. Any global or line-level rebate shows on a separate rebate row beneath, so the customer reads "Wallbox — €Y … Rebate: –€R, Total: €N". Verify the breakdown with the customer's-view preview before sending.

Note: Your own team sees margin % on the offer. The customer-facing view never shows margin. Once you set a custom deal value, margin drops out of your team's view too, since the agreed deal value is then the figure that matters.

Wallbox-only offers (no PV, no battery)

You can build an offer that contains only a wallbox — no solar, no battery, no heat pump. This is the workflow when an existing solar customer wants to add a wallbox separately, or when a customer buys just a wallbox to prepare for a future EV.

1. Create the offer (see Create an offer).
2. Skip PV, battery, and heat-pump planning.
3. Go straight to the Wallbox section.
4. Add the wallbox, EV, and optionally load management.

The customer's PDF shows the wallbox bill of materials and any EV-consumption simulation. Pages that need PV input (yield, self-consumption from solar) either drop out or show zero PV. Preview the customer's-view PDF before sending. If a wallbox-only offer reads oddly because of empty solar pages, contact your Reonic account manager to set up a PDF layout tuned for wallbox-only offers.

Wallbox in country-specific planning

Wallbox planning works across all countries Reonic supports — DE, AT, CH, FR, UK, NL, ES, PT, SE, IT, BE, BR, and others. A few country-specific behaviours:

• France (streamlined planning) — wallbox handling is included in the simplified planning flow, and existing-wallbox detection is supported. If the customer already has a wallbox installed, you can flag it for the load calculation without adding a hardware line item.
• UK / PT / ES / SE — solar and wallbox is the supported planning combination; wallbox planning itself is unrestricted in these markets.
• DE / AT / CH — full planning surface. Any applicable EV-charging subsidies are handled outside Reonic; mention them to the customer as relevant.

The EV-consumption layer is the same across countries — Reonic uses the same model database and the same kWh-per-km approach regardless of where the customer drives.

How wallbox planning affects the customer's offer PDF

The wallbox appears in three places on the customer-facing offer:

1. Bill of materials — the wallbox and any accessories are line items, with article numbers and prices.
2. Annual energy costs page — the Electric car row shows once you have planned both a wallbox and a vehicle, showing the cost-side impact of the EV alongside the household's other consumption. That figure is a 20-year average with tariff escalation applied, not a year-one number, so it reads higher than the customer's current charging cost. Point the customer to the Annual Energy Costs explainer if they ask why.
3. Self-consumption simulation — the EV demand profile is part of the household load curve the simulator uses to compute self-consumption rate, payback, and CO2.

Plan both the wallbox and the EV so the simulation counts the customer's future bill, and the payback math reads accurately for a household that's about to add an EV.

Things to know

• The simulation models EV charging as a weekly load, with smart-charging in low-tariff and excess-solar windows. When the customer intends to charge purely at night or purely from solar, flag it to the install team and talk it through with the customer so the wallbox and energy-manager combo matches the intended behaviour.
• EV consumption needs both wallbox AND vehicle. A wallbox without an EV gives you a hardware line item but no simulation impact. An EV without a wallbox includes the consumption in the household total but not in the wallbox-specific math. For a customer prepping for a future EV, add an EV placeholder (Brand default plus an estimated mileage) so the simulation reflects the realistic future state.
• Charging power comes from the catalog component. Each wallbox catalog entry carries its charging power and its price. Charging power isn't a separate field on the planned wallbox — the planned-add step takes a catalog line item only, and the power comes from the component you picked. To plan a lower operating power, pick a catalog component rated at that power.
• Two wallboxes share the grid connection unless you plan a load manager. Add two wallboxes and the main fuse trips if both cars draw at the same time. Always plan load management for two-EV households unless the grid connection is unusually large.
• Wallbox sizing is the planner's call, not an auto-recommendation. Reonic doesn't suggest "for this EV, an 11 kW wallbox is optimal" and doesn't flag a 22 kW wallbox on a 35 A grid connection. Use the rule of thumb (charging power ≈ grid connection capacity ÷ 1.5), confirm with the electrician, and catch a mismatch at offer time by asking about the Hausanschluss size.
• A representative model works as a placeholder. When the customer hasn't picked a model, choose a representative EV from the database plus a conservative mileage estimate. Swap in the real model later — the wallbox line item doesn't need to change.
• Pricing updates as you edit. The wallbox discount stack (line-level rebate, then option-level global rebate, then custom deal value) updates immediately and locks when the customer signs.
• Battery plus wallbox in one offer is supported. The simulator includes both the battery and the wallbox in the self-consumption model. Payment mode is set per component within a single variant, so you can mix modes — for example battery on financing while the wallbox is a straight purchase — without building separate variants. See Plan battery storage.
• The EV is modelled as a load, not a virtual battery. You can add a V2H/V2G-capable wallbox as a line item and describe the benefit in the component description (use Show description to customer on the catalog component to control whether that description appears on the offer). The simulation counts the EV as additional consumption on the Annual energy costs page. It does not yet credit energy flowing back from the car to the house, so plan around the charging benefit rather than a discharge-to-home return.
• Snapshotted at signature. Wallbox model, EV inputs, charging power, and pricing all freeze when the customer signs. Changes after that require forking to a new variant.

Related

• Plan additional components — load-management modules and energy-management hardware that complement the wallbox.
• Offer optional components as an upsell — wallbox-related upsells (service plan, extended warranty).
• Add PV components manually — the solar side of the simulation.
• Plan battery storage — when the customer wants battery and wallbox together.
• Build a custom load profile — household consumption profile, including EV.
• Apply a global discount — rebates, custom deal value, and what the customer sees.

Need help?

• Step-by-step questions about this flow → contact your Reonic account manager.
• Feature requests / something missing → send a note to your account manager.
• Bug reports → include a screenshot and the URL where it happened in your support email.

Last updated on August 4, 2026