BYD Dolphin Charging Cost Guide for NZ

One of the biggest draws of the BYD Dolphin is how cheap it is to keep charged. Here's the actual breakdown of what it costs to run one in New Zealand, and how the two battery options compare.

Charging hardware

Both Dolphin variants use an onboard AC charger — 7 kW on Standard Range, 11 kW on Premium — and both support DC fast charging, capped at 60 kW on Standard Range and 88 kW on Premium. That gap in DC speed is worth knowing before a road trip: the Premium tops up noticeably faster away from home.

What a full charge actually costs at home

Using a typical NZ residential rate of around $0.30/kWh:

Variant	Usable battery	Cost to fill from empty	Real-world range per charge
Standard Range	44.9 kWh	~$13.50	260–290 km
Premium	60.48 kWh	~$18.20	350–380 km

That works out to roughly $4.70–$5.20 per 100 km on either variant — among the cheapest running costs of any new car sold in NZ, EV or otherwise. Switching to an off-peak or EV-specific power plan (many retailers now offer these) can bring the cost per 100 km down closer to $3.50.

Home charging time

• Standard Range on a 7 kW home wallbox: roughly 6.5 hours for a full charge
• Premium on an 11 kW home wallbox: roughly 5.5 hours for a full charge (assuming the wallbox and household connection support 11 kW single or three-phase supply)

A standard household 3-pin plug will charge either variant, but slowly — plan on 15–18 hours for a full charge, which only really works as an overnight top-up rather than a primary method if you're driving significant daily distances.

Public fast charging costs

Public DC charging costs more per kWh than home charging, typically $0.65–$0.85 depending on the network and time of day. A 10–80% top-up:

• Standard Range: around 30 minutes, costing roughly $16–$21
• Premium: around 35 minutes, costing roughly $22–$28

The lesson here is the same for almost every EV: home charging is dramatically cheaper than public fast charging, so the Dolphin rewards owners who can charge overnight at home most of the time and reserve public DC charging for longer trips.

Annual running cost estimate

For a driver covering 12,000 km a year almost entirely on home charging, expect to spend somewhere around $550–$650 a year on electricity for the Dolphin — compared with $2,200–$2,800 a year in fuel for a comparable petrol hatch covering the same distance. Servicing costs are also lower, since there's no engine oil, timing components, or transmission fluid to maintain.

Tips to minimise your charging bill

• Charge overnight on an off-peak plan where available
• Avoid habitually charging to 100% — charging to 80–90% for daily use is gentler on the battery and rarely necessary given the real-world range on offer
• Precondition the cabin while still plugged in on cold mornings, using grid power rather than battery charge to warm the car
• Reserve public DC fast charging for road trips rather than routine top-ups, given the higher per-kWh cost

For most owners doing typical NZ commuting distances, the Dolphin's charging costs are close to negligible compared with what they replaced — which is the whole point of buying one.