Not everyone can buy a big system at once. That is fine. You can start small and grow, if you plan it right.
Buy these for the future
1. The inverter
Inverters are hard to "add to". If you think you will run an AC within a year, start with 5kVA, not 3kVA. Read 3kVA vs 5kVA.
2. A 48V system
48V is easy to grow. Read 12V vs 24V vs 48V.
Add these later
Batteries
Start with 5kWh. Add another 5kWh later. Use the same model and voltage.
Panels
Add panels up to the inverter's solar limit. Leave roof space. Read how many panels for 5kVA.
A sample plan
| Stage | What you buy | What you get |
|---|---|---|
| Year 1 | 5kVA inverter, 5kWh lithium, 6 panels | Lights, fans, TV, fridge all night |
| Year 2 | +5kWh lithium | AC for part of the night |
| Year 3 | +2–4 panels | Faster charging in rainy season |
Tips
- Keep your invoice and battery model.
- Tell your installer your future plans.
- Do not mix lithium and lead-acid.
