The battery discharges during your highest-demand moments, so the grid sees a lower peak. For factories and large buildings, that lowers the maximum demand charge on every monthly bill.
Surplus midday solar is stored and used in the evening, when air conditioning, cooking and lighting push usage up. Each unit you use yourself is worth more than a unit you export.
With a hybrid inverter and backup circuit, essential loads keep running during an outage: lights, fridge, Wi-Fi, security, servers or a production line's controls.
Time-of-use tariffs, EV charging and rising demand all reward flexible energy. A battery, or a battery-ready system, keeps your options open.
Generate electricity on your roof during the day.
Converts power between DC and AC, so the battery can charge and discharge.
Store energy, from surplus solar or off-peak grid power, until it is needed.
Decides when to charge and when to discharge: shaving peaks, covering the evening or holding a reserve for outages.
Still supplies whatever the solar and battery don't cover, so you are never without power.
Medium-voltage customers pay capacity and network charges on their maximum demand: the highest average power drawn in any 30 minutes of the month. Several large machines starting together, or a hot afternoon with every chiller running, can set that figure even if it lasts only half an hour.
Since July 2025, those demand charges are RM89.27 per kW on the medium-voltage general tariff and RM97.06 per kW on medium-voltage time-of-use, where the peak counts between 2pm and 10pm on weekdays.
A battery watches your load and discharges only when demand approaches the target you set, so the spikes never reach the grid.
A large manufacturer using about 25 million kWh a year, with maximum demand of about 5,000 kW set by short spikes when furnaces, compressors and lines start together. A battery of around 1,000 kW / 2,000 kWh holds the peak at 4,000 kW.
A shopping mall or hotel using about 6 million kWh a year, with peak-hour demand of about 1,500 kW. Solar covers the afternoon, but demand stays high from 6pm to 10pm, still inside the peak window. A battery of around 400 kW / 1,600 kWh, charged by midday solar, carries the evening.
About 24,000 kWh a year (2,000 a month) with most use after dark, and a solar system that exports at midday. A battery of around 15 kWh stores about 12 kWh of that surplus each day for the evening air conditioning, and keeps essentials on during outages.
Scenarios are illustrations using TNB's tariffs in force since July 2025. Savings shown are before the cost of the battery. Actual savings depend on your load profile, tariff, battery size and how the system is operated; for homes, they are higher if your exported solar would otherwise go unused. We model your own data before recommending anything.
Under the green investment tax allowance rules in force until 31 December 2026, battery energy storage for a company's own use falls in the top tier, at 100% of qualifying spending. Budget 2027 extends green technology incentives to 2030; the new rates are still to be confirmed.
Read the guide →If a battery doesn't pay off for you today, we can install a hybrid inverter and leave space and cabling, so adding one later is simple.
Send us your last 12 months of bills. We'll tell you plainly whether solar alone, solar with a battery, or a battery-ready system makes the most sense.