Here's the single most expensive mistake businesses make with solar: getting the size wrong. Buy too small, and your system fails you during peak hours — and you blame "solar." Buy too big, and you pour money into capacity you never use. Getting it exactly right is everything. Here's how to think about it, without the jargon.
Why Sizing Is the Make-or-Break Decision
A solar system is sized around two things: how much power your equipment draws, and how long you need it to run. Get those two right and your system feels effortless. Get them wrong and no amount of panels will fix it. This is exactly why a proper assessment beats buying a "package" off a shelf.
Different Businesses, Different Sizes
Let's make this concrete. Here's roughly how power needs scale by business type — your real number depends on your exact equipment, but this shows the logic:
- Supermarket / retail store: refrigeration and POS systems run constantly, so storage matters as much as panel size.
- Hotel / guesthouse: ACs, water pumps, and 24/7 lighting mean high, round-the-clock demand — usually a larger system.
- Restaurant / lounge: cold rooms, freezers, and evening AC loads need strong battery backup for night-time hours.
- Cold storage / frozen foods: the most demanding of all — a single outage can spoil your entire inventory, so reliability and capacity are non-negotiable.
The One Concept That Trips Everyone Up: Day vs Night
Solar panels produce power during the day. To use that power at night, you need batteries to store it. So a business that runs heavily after dark (like a lounge or a 24-hour cold room) needs more battery storage than one that's busiest at noon. This single distinction explains why two businesses of the "same size" can need very different systems.
Don't guess — assess. The cost of getting sizing wrong is far higher than the cost of getting it checked. A proper load assessment is the difference between a system you love and one you regret.
How YST Gets It Right for You
We start with a free assessment of your actual load and runtime needs, then match you to the right system from our ten package sizes — from compact setups to our 100kW enterprise solution. You never overpay for capacity you don't need, and you never get caught short when you need power most.