SAJ Inverter Review 2026: H2 Hybrid and R6 Specs, Price and Verdict

SAJ (Guangzhou Sanjing Electric) is a Chinese inverter maker that has become a regular name on budget battery quotes in Australia. Most homeowners will see the H2 hybrid inverter paired with SAJ’s B2 or B2S high-voltage battery. Some solar-only quotes use SAJ’s R5 or R6 string inverters instead.

This review covers the H2 hybrid range in detail, with notes on the R6 string range and the matching batteries. It is based on manufacturer documentation, warranty terms, published pricing and owner and installer feedback; Solar Cobber did not test the product and was not paid by the manufacturer.

What it is and how it works

The H2 is a transformerless hybrid inverter: it runs your panels, charges and discharges a high-voltage battery directly over DC, and switches to backup when the grid fails. The R6 is a grid-only string inverter with no battery port.

Here is what SAJ Australia currently lists, and what the Clean Energy Council (CEC) approved inverter list showed when we checked on 14 October 2026:

Two details matter. First, SAJ’s AU R6 datasheet lists 5, 6, 8 and 9.9 kW single-phase models that we could not find on the CEC list, so for a small single-phase string system the R5 is the SAJ model with a current listing. Second, the H2-15K-T2-AU and H2-20K-T2-AU in SAJ’s 10 to 30 kW datasheet were not on the list either. Listings are often renewed, but an inverter installed after its listing lapses cannot attract STCs.

SAJ also sells all-in-one systems (HS2, HS3 and the new HS5), which sit outside this review.

Specs that matter in Australia

Panels and trackers. The H2-S3 has three trackers taking 16 A each, so an installer can put east, west and north roof faces on separate inputs and use today’s high-current panels without clipping. The smaller H2-S2 has two 16 A trackers and a 550 V limit. SAJ quotes 150% DC oversizing, but the STC rules cap you at 133% for the rebate, so a 5 kW H2 normally gets about 6.6 kW of panels.

Heat. All H2 models are IP65. The single-phase and 5 to 10 kW three-phase units are fanless and start derating above 45°C; the 10 to 30 kW model uses fans and is rated under 50 dB. Mount it out of afternoon sun on west and north walls.

Backup. This is a real strength. On the H2-S3, the backup output equals the inverter’s rated power (5 kW on the 5 kW model up to 10 kW on the 10 kW model), with a 60-second peak of 6 to 12 kVA and a switchover SAJ puts at 10 ms. Even the 5 kW H2-S2 is rated for about 5 kVA of backup. Whether that covers your whole house or selected circuits depends on how the installer wires it.

Battery limits. The single-phase H2 models accept 85 to 450 V batteries with 30 A (H2-S2) or 50 A (H2-S3) of charge current. Installers on Whirlpool report 20 kWh as the largest single B2 stack on single-phase H2 models, with parallel stacks needed beyond that. The three-phase H2-T3-AU takes two battery inputs from 180 to 800 V.

Three phase. SAJ says the H2-T2 supports 100% three-phase imbalance, which helps homes whose loads sit mostly on one phase. See our guide to single vs three phase solar.

VPPs and export limits. SAJ’s 10 to 30 kW datasheet mentions VPP-rate battery charging, but we could not confirm which Australian VPPs support SAJ. A Solar Choice reviewer complained of no Amber-style automation. Ask the installer which VPPs and dynamic export schemes the H2 has been approved for in your network area. Our VPP explainer covers the basics.

Price in Australia

SAJ does not publish retail prices, and we found no current independent range for the inverter alone. What is published:

Solar4Ever does not say whether its list is supply-only, and the Whirlpool posters did not say whether their figures were before or after the battery discount, so treat these as rough guides only. SolarQuotes’ Finn Peacock says SAJ is “pretty much bottom of the market” on price.

Rebates. The federal Cheaper Home Batteries Program applies to the battery, not the inverter. DCCEEW says the STC factor is 6.8 per usable kWh for the first 14 kWh from May to December 2026, 60% of that from 14 to 28 kWh and 15% from 28 to 50 kWh, falling to 5.7 from 1 January 2027. A B2-10.0 (9.6 kWh usable on the CEC list) would create about 65 certificates, roughly A$2,600 at a A$40 certificate price. Both B2 and B2S are on the CEC battery list until 31 December 2027. See our battery rebate guide.

Warranty: the fine print

Inverters. SAJ’s Australian limited warranty covers the R5, R6, H1, H2, HS2 and AS2 series for 10 years from commissioning or 10 years and 6 months from shipment, whichever is earlier, so old stock can arrive with time used. You can buy an extension to 15 or 20 years, but only within 18 months of installation or 30 months of shipment. Note that the H2 datasheets list “5/10/15/20” years and older reviews (Solar Choice, 2024) describe a 5-year standard term; the current AU policy says 10.

SAJ repairs or replaces at its discretion and may supply a non-new replacement. The policy says SAJ covers “approved repair or replacement costs” but does not spell out labour for your installer, so ask who pays for the swap. The warranty excludes damage from an incompatible battery, poor ventilation, grid overvoltage and lightning. Claims go through your installer first.

Batteries. SAJ’s AU battery warranty (V4.0) gives the B2, B2S and BU2 10 years, retaining 60% of usable capacity, or a minimum throughput of 3.06 MWh per usable kWh, whichever comes first. SolarQuotes works out that at one full cycle a day the throughput runs out just before 8.4 years. Faults must be reported within 30 days, the battery must be installed within 6 months of leaving SAJ’s factory, and it must operate between -10°C and 50°C. SolarQuotes’ review describes 70% retention and says the warranty drops to 5.5 years if the battery is not registered and online; we could not find either condition in the V4.0 document, so ask your installer to confirm in writing.

SAJ’s Australian entity is SAJ Digital Energy Australia Pty Ltd in Melbourne. Its own documents give two different Victorian addresses (Point Cook and Docklands). Australian Consumer Law rights apply on top.

What owners and installers report

SAJ’s inverter has about 60 owner reviews on SolarQuotes (49 five-star, 3 one-star), and Solar Choice shows 4.52 out of 5 from 60 reviews. The battery has 27 reviews on SolarQuotes. SolarQuotes does not include SAJ among its recommended brands because it lacks long-term reliability information, and Finn Peacock’s short verdict reads: “Cheap like a Growatt”, but without “the solidness of a GoodWe”. Whirlpool posters in 2025 describe it as a long-running niche brand that is “very good value”.

Praise centres on price, a simple install and an easy app for basic monitoring. Complaint patterns:

• Support speed. SolarQuotes reviewers describe support that took more than three days to reply with the wrong answer, no help over holiday periods, and 17 days to replace an inverter that failed during a firmware update.
• Settings and firmware. Owners report time-of-use charging that exported instead of charging, settings that take about five minutes to apply in the elekeeper app, a battery that would not charge to full, and a firmware fault that stopped charging for a day.
• Inverter stalls. Owners on SolarQuotes and Solar Choice report the inverter cutting out on sunny days or sitting in wait mode after an error until it is restarted manually.
• App rating. The elekeeper app rates 3.3 out of 5 from about 1,675 ratings on Google Play (a global figure).

No SAJ product appeared on the Clean Energy Council’s product recalls page when we checked in October 2026.

SAJ H2 vs alternatives

Choose SAJ H2 if price comes first and you want strong backup output, ideally from an installer who will handle support for you. Sungrow SH-RS costs similar money with a much larger Australian installed base. GoodWe suits three-phase homes wanting the ET G2, and Solis suits those happy with a 48 V battery.

Questions to ask your installer

• Which exact H2 model are you quoting, and is it on the CEC list now and on my install date?
• If it is an H2-S3 or R6, has the CEC listing been renewed past November 2026?
• Which SAJ battery is included (B2 or B2S), and how many kWh usable per the CEC list?
• Will the backup cover the whole house or selected circuits, and what is the backup rating?
• Who pays for labour if the inverter or battery needs replacing under warranty?
• Will you register the warranty, and does SAJ require the battery to stay online?
• Which VPPs and dynamic export schemes is this system approved for in my area?
• Where will it be mounted, and will it be out of direct afternoon sun?

FAQ

Is SAJ a good inverter brand?

It is a budget brand with competitive specs and a 10-year warranty. SolarQuotes does not yet recommend it because of limited long-term reliability data, and owners report patchy support.

Is SAJ approved in Australia?

Yes, many SAJ models are on the CEC approved inverter list, but listings for the H2-S3 and most R6 models expire in November 2026. Check the exact model on install day.

How long is the SAJ inverter warranty?

Ten years from commissioning under the current AU policy, extendable to 15 or 20 years for a fee if you apply within 18 months of installation.

Which battery works with the SAJ H2?

SAJ’s B2 HV and B2S HV batteries. Using an incompatible battery is excluded from the inverter warranty.

Does the SAJ H2 work in a blackout?

Yes, with a battery it switches to backup in about 10 ms (SAJ’s figure) and can supply up to its rated power, depending on how the backup circuits are wired.

Is SAJ the same as Sungrow or GoodWe?

No. SAJ (Guangzhou Sanjing Electric) is a separate Chinese manufacturer with its own inverters, batteries and the elekeeper app.

Find an installer

With a budget brand, the installer’s support matters as much as the hardware, because your warranty claim starts with them. Use our installer directory to find SAJ installers near you, and check our guide on how to compare solar quotes before you sign.