Should I install solar, a heat pump or an EV charger first in South Africa?

Answer first: Kill the expensive, always-on loads first (geyser → heat pump or solar water), then size PV to the new daytime shape, then add battery for the outages you actually live through, then add the EV wallbox on a managed circuit. Reversing that order is how households buy too much inverter for yesterday’s geyser and too little roof for tomorrow’s car.

Why order matters for rand saved

A resistive geyser can dominate winter morning and evening kWh. Swap or hybridise that load and your residual profile changes — which changes PV size, battery size and whether a 5 kW inverter is enough. An EV added later without load management can recreate the same evening spike you just paid to remove. Sequence protects the savings story you take to the bank or HOA.

Recommended sequence (most SA suburban homes)

1. Measure. Last 12 months of bills, prepaid token history, or a clamp meter on geyser / stove / pool. Note Stage 4–6 habits.
2. Water heating. Heat pump or solar thermal / PV-ready element strategy — see water heating and heat pump + solar + EV.
3. Efficiency quick wins. LEDs, geyser timer, pool timer, seal obvious drafts. Cheap negawatts beat panels.
4. PV + hybrid inverter sized to the new daytime load with honest export assumptions (panel count, inverter size).
5. Battery for essential loads / shedding — usable kWh, not sticker kWh (Stage 6, do I need a battery).
6. EV wallbox on a dedicated circuit with amperage cap / dynamic limit so it soaks midday surplus when possible (EV from solar, TOU / prepaid).
7. SSEG / CoC close-out so the system is legal to claim and insure (SSEG steps).

When to break the sequence

Sizing cues (illustrative, not a quote)

• Heat pump water: often cuts geyser kWh sharply; leave headroom in the inverter for morning recovery if you shift to cheaper TOU windows.
• PV: size primarily to self-consumption after the heat-pump and daytime loads; export credits ~108–185 c/kWh incl. VAT across major metros in 2026/27 are a bonus, not the business case.
• Battery: essentials first (lights, Wi-Fi, fridge, gateway, selected plugs). Emptying a house battery into an EV overnight needs intentional design.
• EV: most commuting fits single-phase ~7.4 kW; do not buy 22 kW three-phase “for future proofing” without supply and car limits checked.

Money order vs anxiety order

Buyers often flip the stack: Stage 6 anxiety → huge battery → leftover cash → undersized PV → geyser still roasting money. Flip it back. Bill savings fund resilience. A slightly smaller compliant system that is registered and monitored beats an oversized grey-import stack that never finishes SSEG — red flags.

Estate and sectional-title wrinkle

HOA solar aesthetics, EV conduit rules and body-corporate bay permissions can force parallel paperwork tracks. Start those emails the same week you measure loads so hardware does not sit in a box awaiting a trustee meeting — estate EV, sectional-title solar.

Quick FAQ

Can I install everything in one weekend? Rarely if SSEG and HOA are involved — plan weeks, not days.
Heat pump or PV first if cash is limited? Usually water-heating efficiency first if the geyser is the villain on the bill.
Does a heat pump remove the need for solar? No — it changes the shape of the load solar should hit.

Worked example (illustrative suburban home)

A Johannesburg household uses ~850 kWh/month, with the geyser an obvious winter spike. They drive 1 200 km/month in a car due next quarter. Path: (1) heat-pump geyser swap scheduled first; (2) two months of post-swap bills; (3) PV sized to daytime residual plus future midday EV soak; (4) 5–10 kWh-class usable battery for essentials through Stage 4; (5) 7.4 kW wallbox with a 20–25 A evening cap on TOU peak. They skip 22 kW three-phase because the supply and onboard charger do not justify it. Export is modelled at City Power’s published 2026/27 embedded-generator energy credit (~143 c/kWh incl. VAT class figures on our metro desk) — useful, not the hero.

TOU and prepaid timing

If you are on a time-of-use tariff, shifting heat-pump recovery and EV charging into cheaper windows can out-earn a few extra panels. Prepaid exporters in some metros face meter migrations — confirm before you assume netting works the way a salesperson sketched on a napkin (TOU / prepaid EV, prepaid + solar). Order still matters: know the tariff rules before you freeze hardware.

Contractor sequencing on site

One scaffold / one DB opening / one CoC wave is cheaper than three separate circuses. Even when cash is staged, ask installers whether heat-pump plumbing, PV DC runs and EVSE AC circuits can share a mobilisation. Estate access permits often have lead times — lodge them against the whole programme, not each trade.

What success looks like at month six

• Geyser kWh down meaningfully on the bill breakdown or clamp readings.
• PV self-consumption high enough that export is a rounding line, not the pitch.
• Battery cycles covering the outages you planned for — not flattening every afternoon for vanity 100% backup.
• EV mostly charged before 17:00 or inside off-peak windows without tripping the main.
• SSEG file closed; CoCs filed; monitoring alerts go to an email you actually read.

Checklist you can hand an installer

1. Attach 12 months of bills and a note on geyser type.
2. State EV arrival date and onboard AC kW limit.
3. Ask for two designs: (A) heat-pump-first then PV; (B) PV-only with geyser unchanged — compare 5-year rand.
4. Require load management on any EVSE sharing the house main.
5. Name the metro SSEG path and who files it.
6. Reject soft rankings and “best in SA” stickers without datasheets — named facts only.

Bring the same checklist to every bidder so differences are scope, not storytelling. Structured comparison is the point of get quotes.

Related answers

• Heat pump + solar + EV whole home
• Water heating guide
• Home solar guide
• Is solar worth it?
• Installer red flags
• Solar finance