For the question of what kVA genset a house needs, the rough guide is: a small home (lights, fridge, fans) needs 5–10kVA, a medium home with 1–2 air conditioners needs 10–15kVA, and a large home with several air conditioners needs 15kVA and up. Always total your full load and add a margin for aircond starting load.
Pick a genset that is too small and it trips the moment the aircond kicks in; too large and you overpay on diesel and rental. Work out your load properly before you book.
What kVA genset for a house by size?
Quick guide: small home 5–10kVA, medium home 10–15kVA, large home 15kVA and up. These are estimates only — the real size depends on what you want to run at the same time.
A small home usually only needs lights, a fridge, fans and a few basic sockets — a low load, where a small genset is plenty. Once air conditioning enters the picture the load jumps sharply, because the aircond is the single biggest power draw in any house.
For a large home with 3–4 air conditioners, a big fridge and a water pump, it is safer to go for 15kVA and up. Better to have headroom than to have the genset overload and trip in the middle of the night.
- Small home (lights, fridge, fans, TV): around 5–10kVA
- Medium home (+ 1–2 air conditioners, water pump): around 10–15kVA
- Large home (3–4 air conditioners, lots of appliances): around 15kVA+
- Bungalow / high load: can reach 20kVA or more
| House Type | Main Load | Estimated kVA |
|---|---|---|
| Small | Lights, fridge, fans, TV | 5–10kVA |
| Medium | + 1–2 air conditioners, water pump | 10–15kVA |
| Large | 3–4 air conditioners, many appliances | 15kVA+ |
How do you calculate your home's load?
The most accurate way: list every appliance you want to run at the same time, add up the watts of each one, then convert to kVA. This is your load list — a must before booking a genset.
Most appliance labels show power in watts (W). Add them all up, divide by 1000 to get kW, then divide by the power factor (typically 0.8) to get an estimated kVA.
Add a 20–30% buffer on top of the total load so the genset is not running at full capacity all the time. A genset that is constantly maxed out heats up quickly and burns more diesel.
- List every appliance running at the same time (not the whole house)
- Add up the watts → divide by 1000 = kW
- kW ÷ 0.8 (power factor) = estimated kVA
- Add a 20–30% buffer for safety
| Appliance | Estimated Watts (running) |
|---|---|
| LED light (each) | 5–15W |
| Fridge | 100–250W |
| Ceiling fan | 50–80W |
| 1.0HP air conditioner | ~900W |
| Home water pump | 250–750W |
Why does aircond starting load matter?
Air conditioners and water pumps draw several times their normal running power just to start up — this is called the starting load or surge. Ignore it and the genset can trip even when the running load looks low.
For example, an aircond running at ~900W might pull 2–3 times that for a moment as the compressor kicks in. When several air conditioners start at once, that spike can overload a genset that is sized too tight.
That is why we size a genset by its peak, not its average. Give your appliance list to the supplier so they can recommend a size that accounts for this surge.
- Motors (aircond, pump, fridge) have a surge spike on startup
- Surge can be 2–3× the running load for a brief moment
- Size the genset by peak load, not average
- Don't start every aircond at once if the genset is sized tight
| Load | Effect on Genset Size |
|---|---|
| No air conditioning | Size by running load only |
| With aircond/pump | Add margin for starting load |
Which genset is right for home use?
For home use, most cases fall in the 20kVA-and-below range, though large homes or events can need more. PowerRent offers a 20kVA–500kVA+ range, so there's a size for the home end too.
A diesel genset suits continuous loads and is built tough — the usual choice for home standby and events. Every unit is DOSH certified and can be delivered same-day across the Peninsula.
For Sabah, Sarawak and Labuan, delivery follows unit availability. Send us your load list and we'll match the right size — not sell you more than you need.
- Available range: 20kVA–500kVA+ (homes are usually at the lower end)
- Diesel genset — handles continuous loads
- DOSH certified, same-day delivery across the Peninsula
- Rental from RM80/day — cost depends on kVA, duration & delivery
| Rental Cost Factor | Why It Matters |
|---|---|
| kVA size | Bigger size, higher rental |
| Rental duration | Daily / weekly / monthly |
| Delivery & diesel | Depends on location & usage |
- Small home ~5–10kVA, medium ~10–15kVA, large 15kVA and up — all estimates only.
- Always build a load list: total watts ÷ 1000 ÷ 0.8 = estimated kVA.
- Air conditioners and pumps have a 2–3× starting load — size by peak, not average.
- Add a 20–30% buffer so the genset isn't running at full load all the time.
- PowerRent range 20kVA–500kVA+, DOSH certified, rental from RM80/day.
Contact Us Now — Reply Within 1 Hour
What kVA genset for a house? Small homes 5–10kVA, medium 10–15kVA, large 15kVA+. Calculate your load first and allow for aircond starting load. WhatsApp for a quote.
WhatsApp NowFAQ
What kVA genset do I need for a house with air conditioning?
For a house with 1–2 air conditioners, around 10–15kVA is usually enough, while 3–4 air conditioners need 15kVA and up. Remember air conditioners have a high starting load, so always add a margin. Send your load list for an accurate quote.
Is a 5kVA genset enough for a house?
A 5kVA genset is usually enough for a small home with lights, a fridge, fans and basic sockets, with no air conditioning. As soon as you add one aircond, it most likely won't be enough. Total your watts first to be sure.
How do you convert watts to kVA?
Add up all the watts, divide by 1000 to get kW, then divide by the power factor (typically 0.8) for an estimated kVA. Example: 8000W ÷ 1000 ÷ 0.8 = 10kVA. Then add a 20–30% buffer.
Why does my genset trip when the aircond starts?
An aircond pulls 2–3 times its normal power for a moment as the compressor starts up (starting load). If the genset is sized by running load alone, that spike can overload it and trip. The fix: size the genset by peak load.
How much does it cost to rent a genset for a house?
Rental starts from RM80/day, but the real cost depends on the kVA size, rental duration, delivery and diesel usage. A larger genset and a longer duration change the price. Contact us for a quote based on your needs.
What type of genset is best for a house?
A diesel genset is usually the best choice for home use and standby because it's built tough and stable for continuous loads. Our units are DOSH certified with a 20kVA–500kVA+ range. Send your load list and we'll recommend a suitable size.