How future-proof and expandable is the system, can I add an EV or will it suit a bigger family without starting again?

Modern modular platforms — Sigenergy among them — are built to grow with the property.

Battery expansion: Extra modules can be added within roughly the first 1–3 years while models stay compatible.

Solar expansion: More panels on available roof or ground-mount space without re-engineering the core inverter layout.

EV charging: Bidirectional DC chargers can charge from daytime solar and, where the vehicle supports it, feed the home during low solar or peak evening load.

Expansion works when the system is sized with growth in mind upfront — oversized array (cheap), modular battery bank (expandable). That’s how you add EV load or family size without starting over.