SAJ review

SAJ - Inverter Reviews

4.9

Based on 19 ratings

Finn's SAJ Inverters Review & Verdict

Finn Peacock has been a Chartered Electrical Engineer since 1998, and is ex-CSIRO

I'm not going to judge these because I have no experience with them.  All I know at the moment is that they are very cheap at the wholesalers compared to the other inverter brands. If you get one of these, just be aware that price-wise they are pretty much bottom of the market. It will be interesting to see how they hold up over time.

SAJ Inverters: Pros & Cons

  • Cheap like a Growatt
  • Doesn't seem to have the solidness of a GoodWe

About SAJ

SAJ is a Chinese producer of low cost solar inverters. Its full name is Guangzhou Sanjing Electric Co. LTD. The first word stands for Guangzhou City, which is where its headquarters are located.

In addition to solar inverters, SAJ also supplies batteries and electric pumps, but I’ll only describe their residential solar inverters here.

A Melbourne Office

SAJ has an Australian office in Melbourne. Its address is:

  • 1 Precision Lane, Notting Hill, VIC 3168

An Australian office is always an advantage if there is a problem with an overseas product. If you have an issue with your inverter your first port of call should be the installer you bought it from. But if they’re no longer around you can make a warranty claim from the manufacturer – provided they have an Australian office. If they don’t, then the importer is responsible for the warranty.

SAJ Solar Inverters

SAJ produces two main series of residential solar inverter:

  • R5 single-phase inverters
  • R6 3-phase inverters

I’d normally recommend homes with 3-phase power use a 3-phase inverter, but 3-phase properties can use single-phase inverters.

R5 Single-Phase Inverters

Capacity: These single-phase inverters range from a tiny 0.7kW up to 12kW. As few manufacturers make very small inverters, SAJ is an option for applications that require them.

MPPTs: All R5 inverters under 3kW have a single Multiple Point Power Tracker (MPPT) This means that, in normal circumstances, panels will only be able to face one direction. All R5 inverters over 3kW have two MPPTs. If you want a 3kW inverter, they make one with a single MPPT and another with two.

Efficiency: Higher capacity R5 inverters tend to have higher efficiency. Their average efficiency ranges from 96.4% to 98.3%. For a 5kW inverter it’s 98% or 98.7% depending on the model. While not bad, this isn’t exceptional for inverters like this that don’t have fans and rely on natural convection for cooling.

Operating Temperature: Their operating temperature ranges from -40° to 60°C. Inverters normally derate and reduce their maximum power output when they approach their maximum operating temperature. Their derating temperature is not given on their datasheets or in their installation manual, but I would expect them to derate from 45-60°, as SAJ’s 3-phase inverters do. Assuming this is correct, they have a suitable temperature range for Australia.

SAJ R5 Inverter

R6 3-Phase Inverters

Capacity: SAJ’s 3-phase inverters range from 3kW to 50kW, with the larger ones for commercial installations rather than residential. Not many 3kW and 4kW 3-phase inverters are on the market, so if you want a small one, SAJ is an option.

MPPTs: The number of MPPTs depends on the size and model of inverter. The MPPT number and associated capacities are:

  • 2 MPPTs = 3-15kW
  • 3 MPPTs = 5-10kW
  • 4 MPPTs = 25-50kW

Efficiency: The datasheets for SAJ’s 3-phase inverters say their average efficiencies range from 97.8% to 98.7%. But the datasheet for their R6-(5-10kW)-S3 inverters says their maximum efficiency is 98.2% but also says its Euro efficiency figure – an average value calculated in a set way – is 98.7%. Since its average value can’t be higher than its maximum value they have clearly made a mistake and the real efficiency of these inverters is a mystery.

Operating Temperature: The operating temperature is given as -40 to 60 degrees. But the 3-phase inverters will derate at temperatures over 45 degrees. This means between 45 and 60 degrees its maximum power output will decrease. While it’s not good that they derate, this temperature range is still suitable for Australian conditions.

SAJ R6 Inverter

Oversizing

It’s normally a good idea to have solar panels with a total capacity greater than the inverter’s capacity. This is referred to as “oversizing”. In practice, most rooftop installations can oversize up to 133%. But in some circumstances, it may be possible to oversize up to what the inverter can handle. Some SAJ inverters can only be oversized up to around 133% but most can accept up to 150%. The exact figure will depend on the specific model.

Installation Location

According to their installation manuals, SAJ inverters must be installed out of direct sunlight. But they don’t say they have to be located out of direct rain.

10 Year Warranty

SAJ’s R5 and R6 series of inverters come with 10-year warranties. This is a standard period for solar inverters these days.

A Low-Cost Inverter

SAJ inverters are low-cost, so I don’t think it’s reasonable to expect them to be as reliable as higher-end inverters. But some may consider a greater chance of failure a reasonable trade-off against their low price. But note the labour cost involved in replacing an inverter can be high.

Currently, SAJ aren’t among the inverter brands we recommend because we don’t have good information on their long-term reliability. If you want to see a chart of the inverters we do recommend, you can check out our Solar 101 Guide.

If you have a SAJ inverter and would like to leave a review, the information will be appreciated.

Reviewers report paying:
$3,000 - $6,750

For a

solar system with a
SAJ inverter

Depending on hardware choice and installation difficulty

SAJ has no solar inverters in our database

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SAJ Reviews (19)

Show Most Relevant reviews from All time

  • 5 star 17
  • 4 star 2
  • 3 star 0
  • 2 star 0
  • 1 star 0

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It runs quiet even at full speed.

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

Hasn’t missed a beat. The performance we were expecting has been achieved . Very happy with it.

Panel Brand

Seraphim

System Cost

$6,000 to $8,000

System Size

6.6kW

Installed By

Panel Brand

TW Solar

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

Panel Brand

Jinko Solar

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

An incentive was offered by Empower Solar Australia for this review. Learn more here.

Pretty quiet during operation.

Panel Brand

TW Solar

System Cost

$4,000 to $6,000

System Size

6kW

Installed By

Seems to be working well but only had it a week

Panel Brand

Risen

System Cost

$2,000 to $4,000

System Size

6kW

Installed By

Panel Brand

JA Solar

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

An incentive was offered by PSW Energy Perth Solar Warehouse for this review. Learn more here.

So far so good. Has a good length warranty on it so if anything does go wrong it can be dealt with

Panel Brand

I don't know

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

An incentive was offered by Hello Solar for this review. Learn more here.

No problems - the app to use with it was great - even found a YouTube video on how to set it up with no problems.

Panel Brand

LONGi Solar

System Cost

$2,000 to $4,000

System Size

10kW

Installed By

An incentive was offered by PSW Energy Perth Solar Warehouse for this review. Learn more here.

Panel Brand

Risen

System Cost

$2,000 to $4,000

System Size

5kW

Installed By

System Cost

$4,000 to $6,000

System Size

6kW

Installed By

System Cost

$4,000 to $6,000

System Size

5kW

Installed By

Panel Brand

HT-SAAE

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

Allan is so helpful, he resolved all my problems and made things smooth and easy.

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

Excellent customer service! Allen and Dali are very professional and helpful. Thanks a lot!

System Cost

$4,000 to $6,000

System Size

1.5kW

Installed By

Very reliable inverter, which generates more power than I expected

System Cost

$4,000 to $6,000

System Size

6.6kW

Installed By

System Cost

$8,000 to $10,000

System Size

13kW

Installed By

Panel Brand

Canadian Solar Inc

System Cost

$2,000 to $4,000

System Size

6.6kW

Installed By

Panel Brand

Canadian Solar Inc

System Cost

$4,000 to $6,000

System Size

9kW

Installed By

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