Transformer Sizing — Apartment Society
Recommended standard kVA for a apartment society from connected load, diversity and growth.
Lifts, pumps, common areas plus flat-wise diversity — societies habitually size on connected load and buy twice the transformer they need. The calculator applies diversity, converts at your power factor, adds growth and lands on the next standard rating sized for 75% day-one loading.
kVA = kW ÷ PF, then diversity discounts the connected total and the 75% loading target leaves thermal headroom (see the hot-spot tool for why). Oversizing wastes no-load losses 24×7; undersizing eats insulation life — 65–80% day-one loading is the sweet spot.
Planning estimate only — interconnection, protection settings and compliance must be reviewed and signed off by a licensed electrical engineer and your utility before energisation.
Use the free Transformer Sizing — Apartment Society online — Recommended standard kVA for a apartment society from connected load, diversity and growth. Runs instantly in your browser: no signup, no upload, mobile-friendly.
About Transformer Sizing — Apartment Society
Lifts, pumps, common areas plus flat-wise diversity — societies habitually size on connected load and buy twice the transformer they need. The calculator applies diversity, converts at your power factor, adds growth and lands on the next standard rating sized for 75% day-one loading.
How to use Transformer Sizing — Apartment Society
- 1Enter the connected load and the facility-appropriate diversity.
- 2Set power factor and growth margin.
- 3Read the recommended standard kVA and day-one loading.
Why use Transformer Sizing — Apartment Society?
- ✓Diversity-honest demand math — connected load is not demand
- ✓Standard ratings ladder with a 75% day-one loading target
- ✓Growth margin handled explicitly, not by silent oversizing
- ✓Facility-typical diversity defaults from field practice
Frequently asked questions
How do I size a transformer for my building or facility?+
Demand = connected load × diversity factor; kVA = demand ÷ power factor; add growth; pick the standard size that puts day-one load near 65–80%. The classic error is sizing on connected load — paying for (and losing core-loss energy in) capacity that never gets used.
What diversity factor should I use?+
Field-typical: homes 40–60% (everything never runs at once), offices 65–75%, hotels 60–70%, continuous industry 75–85%, EV chargers ~90–100% unless managed. The preset here matches this facility type; refine with measured maximum demand where any exists.
Why target 75% loading instead of using full capacity?+
Three returns: thermal headroom (insulation life — see the hot-spot tools), efficiency (transformers peak near 50–60% load), and contingency room. Above ~85% sustained, you're trading transformer life for capex deferral, usually unknowingly.
Is oversizing a transformer harmful or just wasteful?+
Both, mildly: core (no-load) losses burn 24×7 in proportion to size — an oversized unit wastes energy at 3 a.m. forever (the loss tools price it). It also costs more upfront and can worsen protection sensitivity. Size for demand + honest growth, not for fear.
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