Essential rangeSAJ EK70 and H2
A big battery, without the big price.
SAJ has made inverters since 2005 and has sold in Australia since 2013, with an office in Point Cook. We fit two systems: the new EK70 all in one, and the H2 hybrid with SAJ's B2S battery. Both stack up to a lot of storage for the money.
54 kWh
EK70 stack, six 9 kWh modules
10 ms
switch to backup
200%
solar on the EK70 inverter
10,000
cycles in the EK70 battery cells
Why we fit SAJ
More kWh for your dollar.
If you want to cover the evening, the night and a cloudy day, you need kilowatt hours, and SAJ gives you more of them for the money than anything else in our designer.
The EK70 puts the inverter and up to six 9 kWh LFP modules in one stack, with a DC optimiser in every module and 10 ms switchover in a blackout. The H2 is the proven option, paired with SAJ's B2S modules. Both report to the elekeeper app, and to us.
- Essential range in our designer: the most storage for the money
- LFP cells, the safest common home battery chemistry
- Takes plenty of solar, so you can grow the array
Datasheet
The models we install.
The SAJ systems in our book, single and three phase. Your design picks the size; we confirm it against your switchboard.
EK70 all in one (HS5 inverter + BU5 battery)
| Model | Phase | Inverter | Solar it can take | Backup | Efficiency |
|---|---|---|---|---|---|
| HS5 5K S3 | Single | 5 kW | 10 kW | 5 kVA, 10 kVA for 10 s | 98.0% |
| HS5 8K S3 | Single | 8 kW | 16 kW | 8 kVA, 16 kVA for 10 s | 98.0% |
| HS5 10K S4 | Single | 10 kW | 20 kW | 10 kVA, 20 kVA for 10 s | 98.0% |
| HS5 10K T3 | Three | 10 kW | 20 kW | 10 kVA, 20 kVA for 10 s | 98.2% |
| BU5 9.0 module | 9 kWh usable | 1 to 6 per stack | 4.6 kW per module | IP66 |
H2 hybrid + B2S battery
| Model | Phase | Inverter | Solar it can take | Backup | Efficiency |
|---|---|---|---|---|---|
| H2 5K S2 | Single | 5 kW | 7.5 kW | 5 kVA, 6 kVA for 60 s | 97.6% |
| H2 8K S3 | Single | 8 kW | 12 kW | 8 kVA, 9.6 kVA for 60 s | 97.6% |
| H2 10K S3 A | Single | 10 kW | 15 kW | 10 kVA, 12 kVA for 60 s | 97.6% |
| H2 10K to 30K T3 | Three | 10 to 30 kW | Up to 200% | Equal to rated power | 98.0% |
| B2S BU2 6.4 module | 6.4 kWh usable | 2 to 6 per stack (12.8 to 38.4 kWh) | Up to 19.2 kW from 6 | IP65 |
- LFP (lithium iron phosphate)
- 10 ms backup switchover
- elekeeper app
- Wi-Fi, Ethernet and 4G options
Figures from SAJ’s own datasheets, as published 2025 to September 2026 (AU versions). The maker’s PDF opens on their website. Your design picks the model that suits your roof and your usage, and we confirm it on site.
Every feature
All of it, grouped.
EK70 all in one
- Inverter and battery in one IP66 stack
- 1 to 6 modules of 9 kWh, up to 54 kWh
- A DC optimiser in every module
- Twice the inverter's rating in solar
- Up to 4 MPPTs on the 10 kW single phase
H2 + B2S
- The proven SAJ hybrid
- B2S modules of 6.4 kWh, all of it usable
- Up to 38.4 kWh on single phase
- Three phase models from 10 to 30 kW
Blackout backup
- 10 ms switchover
- EK70 surges to twice its rating for 10 seconds
- Whole home backup on the EK70 through its 63 A bypass and a changeover switch, or chosen circuits
The elekeeper app
- Live solar, battery and grid flows
- Remote diagnosis, so we often spot a fault first
- Time of use and backup reserve settings
- SAJ lists Origin, Amber, Evergen and GloBird among its VPP partners
Warranty
- EK70: 10 years, 70% capacity at year 10
- B2S: 10 years, 60% capacity at year 10
- H2 inverter: 10 years, extendable to 20
- Claims go through us, not you
Every system comes looked after.
Whichever brand you pick, the same things come with it. Our licensed electricians install it, we watch it from here, and a fault under warranty is fixed at no cost to you.
Included with every system
- High quality installation by licensed electricians
- All-black panels on black rail
- Remote monitoring, set up on install day
- Fault alerts that come straight to us
- Warranty repairs at no cost to you
- Warranty claims handled by us
- Rebates and paperwork done for you
Straight answers
Questions we get asked.
Something not here? Ring or text 0468 179 539 any hour and ask.
Who is SAJ?
A Guangzhou inverter maker founded in 2005, selling in Australia since 2013 through the big wholesalers, with an Australian office in Point Cook, Victoria.
Does it need the internet?
For the full EK70 warranty, yes. SAJ asks that the system stays online and registered; offline, its cover can drop to 5.5 years. We connect it and register it on install day.
Can it back up my whole house?
The EK70 can, through its 63 A bypass and a changeover switch, or it can back up just the circuits you choose. A 5 kW model runs about 5 kW of load, so big ducted air conditioning is usually left off the backup.
Will it get the federal battery rebate?
We confirm the exact battery against the approved list on your quote, and the designer prices the rebate for your install date. The rebate steps down on 1 January.
See an SAJ battery sized for your home.
Draw it, price it, too easy. Design your own system on your own roof and get a real installed price in minutes. Rather talk it through first? Request a call back and we will size it on your actual usage.