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Inverter, battery and whole home backup in one cabinet, warranted by SAJ for 15 years.
Most home batteries we install carry a 10 year warranty. The SAJ EK90 carries 15 on the inverter and battery together, and its cells are rated for 12,000 cycles. Designed, installed and commissioned from our Nambour workshop by the licensed contractor.
Free estimate within 1 business day of receiving your photos and power bill. We can't estimate without photos, and we don't visit to estimate. Want the price locked in? Book a $299 design visit, credited back if you go ahead within 30 days of the visit.
The federal battery rebate steps down on 1 January 2027. Installs finished by 31 December keep the current rate.
15 year warrantyTwo warranties sit on every EK90 we install: SAJ's on the product, ours on the work. Here is what each one covers, straight from the documents.
On the inverter and battery together, from the day it is installed. SAJ repairs or replaces anything faulty in that time.
Our lifetime workmanship warranty (conditions apply, see our Terms) covers the installation itself: the cabling, the connections, the mounting and the switchboard work we do.
SAJ needs the system connected to the internet and registered with them for the full 15 years. We register it at commissioning. If it is never connected or registered, SAJ only promises 7.5 years.
SAJ's warranty needs the system installed and commissioned by a professional installer. That is us: a licensed electrical contractor with SAA accreditation for batteries.
If the app shows a fault, tell us within 30 days and we lodge it with SAJ for you. If your internet drops out for a month or more, let us know so it does not count against you.
One cycle is emptying the battery and filling it again. The EK90's cells are rated for 12,000 of them. That is the cell maker's lab figure, tested at 25°C at a gentle half rate, until the cells are down to 60 per cent of new.
It tells you the cells are built for a very long life. The warranty is what SAJ puts in writing for your home: 15 years, or 4.4 MWh of throughput for every kWh of usable capacity, whichever comes first. Both numbers matter, and here is how they fit together.
The throughput works out to about 4,400 full cycles. A battery that empties and refills completely every single day would reach it in about 12 years. If yours only half empties overnight, that is half a cycle, so it takes twice as long. That is one more reason we size the battery to your evenings.
Cell rating: tested by the battery maker at 25°C, half rate charge and discharge, to 60% state of health. Warranty: SAJ Limited Warranty for EK90 HS5 Residential Product (AU).
The inverter sits on top, the battery modules stack underneath and plug together with no cabling between them. Single phase or three phase, from one module to six.
A single phase home takes 10 kW of total inverter capacity and a three phase home 30 kW, counting every inverter on the property. If you already have solar, the old inverter sometimes comes off the wall and your panels connect to the EK90.
The price assumes your board has the space and is in a condition to take the work. We confirm it from clear photos before anything is ordered. Any board work is quoted separately and approved by you first.
A battery on its own needs no new safety switches. Backup does: each circuit it keeps running needs a Type A safety switch, so whole home backup usually means switchboard work, quoted separately.
10 metres of cable from the main switchboard is included. Past that it is $50 per metre including GST, covering cable, conduit and labour.
The person who quotes your EK90 is the licensed contractor who designs it, fits it, commissions it and answers for it afterwards. No franchise rep and no sales script.
Australian owned and operated. Local crew on the Sunshine Coast. No overseas call centres.
The whole system. SAJ's Australian warranty for the EK90 HS5 gives the inverter and battery together 15 years as standard, starting from the day it is installed. The smart meter and accessories carry 2 years. SAJ also warrants the battery still holds at least 60 per cent of its capacity at 15 years, or until it has delivered 4.4 MWh for every kWh of usable capacity, whichever comes first.
One cycle is emptying the battery and filling it again. 12,000 is the cell maker's rating, tested at 25°C at a gentle half rate charge and discharge, until the cells are down to 60 per cent of their original capacity. It tells you the cells are built for a very long life. The warranty is what SAJ puts in writing for your home: 15 years, or 4.4 MWh of throughput for every kWh of usable capacity, whichever comes first.
Keep the system connected to the internet so SAJ can monitor it and update its software, and have it registered with SAJ. We do the registration at commissioning. Without the internet connection or registration, SAJ only commits to 7.5 years. If your internet goes down for a month or more, let us know.
It can. Whole home backup is built into the EK90 through a 63A bypass, so there is no separate backup gateway to buy, and it switches over in 10 milliseconds or less. Any circuit the battery backs up needs a Type A safety switch, so whole home backup usually means switchboard work. We check your board from clear photos and quote that separately, before anything is ordered.
Not for the battery itself. A battery that stores your solar and cuts your bill does not need a new switchboard or new safety switches. It is backup power that brings in Type A safety switches, on the circuits being backed up. If your board has no spare space, that can mean a new enclosure, and we tell you up front.
Yes. The EK90 stacks 7 kWh or 9 kWh modules, one to six in a stack, up to 54 kWh. Each module has its own DC to DC optimiser, which SAJ designed so every module charges and discharges on its own and the stack can grow later. We size it to your evenings first, not the biggest stack a rebate allows.
The rebate needs the battery on the Clean Energy Council approved list. We check the exact EK90 model against the list on the day we quote and apply the rebate in your written quote. The federal battery rebate steps down on 1 January 2027, so the value that applies is the one in force when your system is installed and commissioned.
Often, yes. The EK90 is an all in one hybrid, so its inverter runs the solar and the battery together. A single phase home can take 10 kW of total inverter capacity and a three phase home 30 kW, counting every inverter on the property, so sometimes your old solar inverter comes off the wall and your existing panels connect to the EK90. We work it out from photos of your current setup.
We do. SAJ's warranty says to start any claim with the installer who sold you the system, so you call us, we diagnose it and we deal with SAJ. SAJ also has an Australian company, SAJ Digital Energy Australia, with a local support line. Our own installation work carries our lifetime workmanship warranty (conditions apply, see our Terms).
SAJ (Guangzhou Sanjing Electric) designs and builds it in Guangzhou, China, and has been in business since 2005. Here in Australia it is backed by SAJ's own Australian company, SAJ Digital Energy Australia, on the product, and by us on the installation.
Send clear photos of your switchboard and meter, and your latest power bill. We size the EK90 to your evenings, apply every rebate you are eligible for, and send a written estimate. Nothing is ordered until the details are confirmed.
Takes 30 seconds. If it is urgent, call 0494 826 740.
SAJ EK90 batteries are installed across the Sunshine Coast and Brisbane, from our two bases in Caloundra and Nambour.
Approved by Daniel Carmont, founder and licensed electrical contractor (QLD Lic 92489). Last updated .