BESS Sizing & Validation Software for Malaysia (TNB)

Software and validation first — not another EPC

Search "BESS Malaysia" and you get installers and EPCs quoting hardware. EWISER sits a step earlier, and independent of any equipment vendor: it sizes the battery, optimises the investment case, and validates it — then works with hardware partners to deliver at the lowest cost. You decide on evidence, not a supplier's pitch.

Because EWISER is vendor-neutral, the sizing is driven by your TNB load and tariff, not by whatever stock a supplier wants to move. That independence is the point: the number you see is the number for your site — and it is a software and validation service, not a hardware sale.

Prove the TNB Maximum Demand saving before you buy

The largest lever on a Malaysian C&I bill is the TNB Maximum Demand charge — set by the single highest half-hour of the month. EWISER's Live Shadow runs a virtual battery on your real TNB-metered load and logs the would-be MD reduction in real time, so the demand-charge saving is proven on your own site before any capital is committed.

This is running today at InverPower in Kuala Lumpur, where a virtual 5 kW / 20 kWh battery holds a 2.9 kW MD ceiling and logs an −11.3% MD shift. Prove-before-you-buy turns a TNB demand-charge projection into measured evidence — see the Live Shadow page for how it works.

EWISER + InverPower: intelligent storage, delivered locally

For Malaysian C&I sites, EWISER partners with InverPower to deliver a complete intelligent-storage solution for Maximum Demand shaving. EWISER brings the control intelligence — the EDM reserve-aware dispatch that holds a reserve for the exact half-hour that sets the monthly TNB Maximum Demand charge — and the Live Shadow validation that proves the saving on your real load first. InverPower delivers, installs and services the system on the ground.

This is the difference between owning a battery and owning a battery that reliably lowers your Maximum Demand: intelligent MD shaving, sized on evidence and controlled by EDM, delivered locally. The EDM reserve-aware control framework and the Live Shadow validation framework are documented in EWISER's technical white papers, linked below.

TNB tariffs and Maximum Demand

Tenaga Nasional Berhad (TNB) bills Medium Voltage commercial and industrial customers (tariffs such as C1 and C2) on both energy and Maximum Demand — the highest half-hour of demand in the month. Because a single peak sets that charge, battery peak shaving targets it directly, and the software models MD reduction against your interval load.

NEM 3.0 solar and self-consumption

Net Energy Metering (NEM 3.0) lets eligible C&I customers offset consumption with rooftop solar and net exported energy against imports. Pairing solar with storage raises self-consumption and shifts midday generation into the evening, which EWISER co-optimises so the combined payback is captured, not an optimistic sum.

Incentives: GITA

The Green Investment Tax Allowance (GITA) can improve project economics for qualifying green assets, including storage and solar. The software lets you reflect available incentives in the capital case so the payback shown is the one your project would actually see — stacked with MD reduction and NEM 3.0, not each stream valued in isolation.

Maximum Demand, ratchets and load factor

Because TNB Maximum Demand is set by a single half-hour, a plant with a poor load factor — brief spikes over a low average — pays disproportionately. Storage improves the effective load factor by clipping those spikes, lowering the billed MD across the months that set it.

The software shows the MD basis month by month, so you can see how much of the annual charge a given battery removes and whether pushing for a deeper shave is worth the extra capacity on a TNB Medium Voltage tariff.

What you need to size a Malaysian site

A TNB bill gives a preliminary estimate; an interval load profile plus your tariff gives an accurate one; and Live Shadow validates it on live metering before you buy. The engine applies TNB MD logic and MYR pricing automatically, and produces an investment-ready report you can take to a client or committee.

Frequently asked questions