A battery lets your home use daytime solar at night. Here is how the current export rules change the maths, and what to check before you buy one.
A home solar battery stores surplus daytime solar so the house can use it in the evening instead of exporting it. Whether that pays depends on how exports are credited. Under SEDA’s Solar ATAP programme, which replaced NEM, a domestic consumer’s exported energy earns bill credits based on the energy charge only, may offset only the same billing period, and any unused export is forfeited, not carried forward. That makes storing surplus more useful than it was under NEM, but a battery is still a large cost that has to be weighed against your own bills. A battery also only keeps lights on in a blackout if the system is designed with a backup output.
Rooftop solar produces most in the middle of the day, while many households use most electricity in the evening and at night. Without a battery, daytime surplus is exported to the grid and night-time use is bought from the grid. A battery (called a BESS, battery energy storage system, in SEDA’s guideline) shifts that surplus: it charges from the panels during the day and supplies the house after sunset.
A battery can also provide backup during a power cut, but only when the inverter and wiring are designed for it. A normal grid-connected system switches off when the grid goes down, for the safety of people working on the lines, so do not assume a battery equals backup.
SEDA’s Solar ATAP page describes the programme as a continuation of the Net Energy Metering (NEM) programme, which concluded at the end of June 2025. The Solar ATAP Guidelines (as of 30 December 2025) set out how exports are treated for homes:
Older articles describing surplus credits rolling over month to month describe the NEM era. Check the current guideline, and ask your installer to state in writing which scheme and terms apply.
| Situation | Battery value | Why |
|---|---|---|
| Household mostly out by day, high evening use | Higher | Daytime surplus can be stored and used after sunset instead of exported |
| Exports regularly exceed what you import in a month | Higher | Under Solar ATAP, the excess beyond your use in the billing period is forfeited |
| Home occupied all day, most solar used directly | Lower | Little surplus to store; the panels already cover daytime use |
| Frequent power cuts and a need for backup | Depends | Only with a system designed for backup; plan which circuits it runs |
| Small system that rarely exports | Low | Nothing much to shift; spend on panels or efficiency first |
A quick way to see where you stand is to look at your latest bill after solar: how many units were exported, how many were imported, and whether the export in that billing period was larger than what you bought. If exports regularly outrun imports, part of your solar is being forfeited and a battery, or using more power in the day, recovers it.
Battery size should come from your own load pattern, not a brochure. A sensible installer asks for your electricity bills and, ideally, how much you use in the evening. The aim is usually to store roughly the surplus you would otherwise export on a typical day, so it can cover the evening. A battery much larger than your surplus sits partly empty; one much smaller leaves surplus exported.
Also ask whether the battery can be added later. Some systems use a hybrid inverter that accepts a battery from the start; others need extra equipment to retrofit one. Our solar panel cost guide covers sizing the panels themselves.
Home batteries today are mostly lithium-based. Rather than comparing chemistry names, ask the installer for the facts that decide value and safety, in writing:
| Ask about | Why it matters |
|---|---|
| Usable capacity (not just total capacity) | What you can actually draw each day |
| Expected cycle life and how capacity declines over time | Decides how many years of value you get |
| What the manufacturer covers, and for how long, in writing | Batteries are the part most likely to need replacing |
| Backup function and which circuits it supports | Many systems give no power at all in a blackout |
| Where it will be installed and how it is ventilated | Heat shortens battery life; location affects safety |
| Who services it and how faults are reported | A battery is a long-term commitment |
The honest answer is that it depends on your numbers. To judge it, compare the battery’s installed cost with what it saves: the electricity you would otherwise buy in the evening, minus whatever credit you would have received for exporting that surplus, over the years the battery is expected to last. Ask for that calculation using your own bills. Be wary of anyone who promises a fixed payback without looking at your consumption.
ClickBina does not publish a battery price or a payback figure, because both depend on the system and the household. What we can say is that the Solar ATAP export rules make stored self-consumption more valuable than it was when NEM credits could be carried forward.
Choosing the right installer matters more than the brand. Our guide to choosing a solar installer explains how to check SEDA registration before signing.
A battery adds weight and equipment inside the house, but the panels still sit on the roof. Leaks around panel fixings are a common after-effect of poor installation; our solar panel roof leak guide explains what goes wrong. If the roof needs work, do it before panels and batteries go in, not after.
Solar and batteries touch the roof, the electrical board and the rooms where equipment goes. ClickBina handles whole-house refurbishment and coordinates the trades around a solar project. WhatsApp us your job details for a quote: your house type, roof, current system if any, and a recent bill. We reply within the hour, the price we agree is a flat price with no hidden charges, and a site visit is RM150, waived if you go ahead.
Method: scheme rules on this page are quoted from the SEDA documents above as they read when we opened them. Schemes change; confirm the current terms with SEDA and your installer.
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