A Johor precast concrete factory put 573 kW of solar and a 522 kWh battery on site - about two hours of battery at full push, built in roughly three months
Hoymiles says a remote concrete prefabrication factory in Johor now runs 572.88 kW of solar with 250 kW / 522 kWh of battery, installed with local partner PATHGREEN ENERGY. Survey to grid connection took about three months. The factory is not named, and no savings figure is published.
A concrete factory in Johor got tired of its power bill.
Hoymiles published a case study this month on a remote concrete prefabrication manufacturer in Johor. The company says rising tariffs were eating into the factory's profit. The fix was 572.88 kW of rooftop solar and 250 kW / 522 kWh of battery storage, delivered with Malaysian partner PATHGREEN ENERGY. Hoymiles says the job went from site survey to grid connection in about three months.
First, the terms. kW is how hard the system can push. kWh is how much energy the battery holds. Think of kW as the width of the tap and kWh as the size of the tank. A 250 kW / 522 kWh battery can run flat-out for about two hours (522 divided by 250). Run it at half that power and it lasts about four.
The hardware. The solar side uses 116 Hoymiles microinverters, each handling up to eight panels. Hoymiles says the DC wiring stays below 140 volts, which cuts arc and shock risk on a factory roof. The storage is two liquid-cooled HoyUltra 2 cabinets. Hoymiles says they hold rated power at 50 C ambient and reach up to 90.3% round-trip efficiency. That means for every 100 kWh you put in, about 90 comes back out.
Analogy: the solar is the tap that only runs in daylight. The battery is a two-hour bucket under it. Fill the bucket at lunch, pour it into the late-afternoon shift or the evening peak.
Workplace meaning. This is the size of job a real Malaysian factory owner can picture: under 1 MW of roof, about 0.9 kWh of battery for every kW of solar, built in one quarter. Remote sites have one more reason to like it. Hoymiles says cloud monitoring and remote fault alerts were a big part of the pitch, because a technician is a long drive away.
Good: Real sizes. Real hardware. A build time. A climate-specific spec (heat and humidity) that matters in Johor.
Bad: The factory is unnamed. There is no ringgit saving, no tariff, no payback period. "Saves significantly" from an unnamed client quote is not a number you can plan with. "Malaysia's first microinverter plus C&I storage project" is the vendor's own claim.
Ugly: This is a sales case study, not an independent audit. A two-hour battery covers a shift change or an evening peak. It does not carry a 24-hour factory through the night.
Soft next step: before you copy this shape, pull 12 months of interval data and see when your peaks land and how many hours after sundown you actually run. Then a short consult at Sovryn Energy /consult if you want that read against your load.
Source: Hoymiles case study (Hoymiles Designer journal, Oct 2026) - Malaysia's First "Microinverter + C&I Storage" Project: Hoymiles Empowers Manufacturing with Energy Independence. Primary for Johor location, concrete prefabrication manufacturer, PATHGREEN ENERGY partner, 572.88 kW PV, 116 x MIT-5000-8T microinverters, 2 x HoyUltra 2, 250 kW / 522 kWh, ~3 months survey to grid connection, <140 V DC, rated power at 50 C, up to 90.3% round-trip efficiency, IP55. Client name, savings and payback not disclosed.