Saturday night. The master bedroom AC is on, the kids have a second AC running next door, someone is cooking rice, and you switch on the water heater. Click. Everything goes dark. Most people blame PLN or the wiring. More often the cause is plainer: the total load running at once is above the installed capacity.
Two-storey homes use power differently from single-storey ones. There is usually more than one AC, a pump to fill the rooftop tank, and a water heater is turning into a basic need. So before you call PLN and pay for extra capacity, do the math. Sometimes you really do need an upgrade. Sometimes a few habit changes are enough.
What MCB size goes with each PLN power class?
Your capacity is enforced by the MCB (miniature circuit breaker) at the PLN meter. The calculation is simple: VA divided by 220 volts. So 2,200 VA equals 10 amperes. These are the MCB sizes commonly used for homes.
| Installed capacity | MCB | Roughly suits |
|---|---|---|
| 900 VA | 4 A | Lights, TV, fridge, fans |
| 1,300 VA | 6 A | Add one small AC, washing machine |
| 2,200 VA | 10 A | Two small ACs plus kitchen appliances |
| 3,500 VA | 16 A | Three ACs, water heater, pump |
| 4,400 VA | 20 A | Induction cooktop plus many ACs |
The last column is only a rough guide. The real answer depends on what you run at the same moment, which is what we total below.
How to work out your own load
- List every big appliance. Check the sticker on the back or underside for the wattage. You only need the heavy ones: AC, water heater, induction cooktop, washing machine, iron, rice cooker, fridge, water pump.
- Mark what runs together. At night, for example: bedroom AC, fridge, TV, lights, router. The water heater and iron tend to be morning loads.
- Add up the watts. Total watts is roughly the VA you need. Leave about 20 percent headroom.
- Compare with your MCB. If the total keeps brushing the limit, the breaker will keep tripping.
As rough ranges (check your own stickers, brands differ): a 1/2 HP inverter AC draws about 300 to 450 watts, a 1 HP about 600 to 900, a fridge 100 to 200, a rice cooker 300 to 400, a small electric water heater 300 to 450, a washing machine 300 to 500, and an induction cooktop 1,000 to 2,000. Non-inverter ACs pull a surge several times higher when the compressor starts, which is why the breaker so often trips right as the AC switches on.
Worked example: a two-storey home with three ACs
Take a family of four in a two-storey house on 2,200 VA. At night: three 1/2 HP ACs (about 1,200 watts), the fridge (150), the rice cooker on warm (350), a water heater for the kids' evening shower (400), plus lights, TV and router (300). That is roughly 2,400 watts, or about 10.9 amperes, above the 10 A breaker. Run it all at once and the breaker will trip. It is a matter of when, not if.
There are three ways out:
- Shift your timing. Shower before the third AC goes on. Free, but it takes discipline.
- Swap the heavy users. Inverter ACs and LED lights cut the load compared with older units.
- Upgrade. If the routine can't change, moving to 3,500 VA makes sense.
Before you apply: what to check
An upgrade isn't only about paying. The wiring has to carry it too. A house's installation is designed for a certain capacity. Before upgrading, ask an electrician or the developer what the installed cable and panel can handle, and whether there is room for extra branch breakers (a dedicated AC circuit, for instance). Raising capacity without checking the cabling can mean overheating in the installation.
Applications go through the PLN Mobile app, the PLN 123 call center, or your local PLN office. Fees follow PLN's official tariff at the time you apply, so read them in the app and not from a third party. Never pay through a broker who promises a cheaper route, because that is how scams start. From application to the breaker being swapped usually takes a few working days, depending on the queue in your area.
Rule of thumb: if the breaker trips more than twice a month at about the same hour, simultaneous load has passed the limit. Write down the time and the appliance you switched on just before. The pattern shows which one to move to another hour.
Not every trip means overload
If the breaker only drops when it rains, or when one particular appliance is on, the cause may be leakage current instead. That is a different problem, covered in our guide to MCB and ELCB tripping in the rain. If you plan to add an electric motorbike, also see how to charge it safely in the carport, since that adds to the night-time load.
For a new home, ask for the installed capacity and the number of breaker circuits at handover. Emerald 70 at Kingspoint (land 47.25 m2, building 70 m2, two storeys) sits on Jl. Raya Perjuangan in North Bekasi, and our team can show you the panel during a visit so you can size your needs before signing.
So the order is: total the load, shift your hours, check the wiring, and only then apply to PLN if you still need to.
Want to see the Emerald 70 panel and breaker circuits?
The Kingspoint team can schedule a visit and walk you through the unit's electrical setup on WhatsApp.
Ask on WhatsApp