Axpert vs Sunsynk

[Isetech]

I have some experience installing Axpert inverters, but only seen a Sunsynk inverter.

A few things that come to mind when deciding which one to offer a customer:

1/ Do you require a backup system? Axpert switching time is very fast, Sunsynk not so fast.

2/ Axpert cannot feed back into the grind (I do believe the newer version are hybrid), Sunsynk can.

3/ The cost of an Axpert is a lot cheaper compared to the Sunsynk.

4/ Remote viewing, both units can link remote viewing. I have installed solar assistant on all the Axpert inverters I manage, Sunsynk can also work with Solar assistant, but now has a data logger and remote viewing. It is a no brainer using remote viewing.

I will update this thread as I become more familiar with the Sunsynk unit.

[Isetech]

Keith made an interesting comment in one of his training videos about " changeover switch" requirements, you dont need it for a Sunsynk because it is bi directional and doesnt switch like an Axpert unit.

Do you have to install a changeover switch when installing Sunsynk inverters, will we see an amendment to this rule in future regs ?

[Isetech]

Bidirectional inverter - like installing a suicide cord for a generator? How do the protective devices work if the flow in in reverse?

[Isetech]

Let the challenge begin, trying to find a 5 KVA Sunsynk inverter

[Justloadit]

Let the challenge begin, trying to find a 5 KVA Sunsynk inverter

See www.enway.co.za, he is based in Durban, he has 5.5Kw Deye's in stock.
Give Devon a call, he is extremely knowledgeable and will guide you.

[Justloadit]

1/ Do you require a backup system? Axpert switching time is very fast, Sunsynk not so fast.

There is no switching over time, it is permanently connected to the grid.
You do not even notice when the supply drops.
There is a beep to let you know, and you can program a beep during the power failure if you like.

[Justloadit]

Keith made an interesting comment in one of his training videos about " changeover switch" requirements, you dont need it for a Sunsynk because it is bi directional and doesnt switch like an Axpert unit.

Do you have to install a changeover switch when installing Sunsynk inverters, will we see an amendment to this rule in future regs ?

No change over switch required, the inverter does all that for you.
I would suggest having a double pole circuit breaker/disconnect, in the case you wish to do a service to the unit.
I would suggest a double pole breaker/disconnect on the load side of the inverter, again for servicing.
I would also recommend a change over switch on the load which can switch between the inverter and the mains supply, in the event of servicing.
Use an ELU after the inverter to your loads

[Justloadit]

Bidirectional inverter - like installing a suicide cord for a generator? How do the protective devices work if the flow in in reverse?

You are misunderstanding the statement. Bidirectional can only operate, if an external CT is used on the DB supplying the inverter, and the loads have been separated as essential, and non essential, and you have PV panels connected.. The essential loads are supplied through the inverter.
If you are using PV panels, and there is more energy available than your essential loads are using, and the battery is fully charged, the inverter measures the total current that the DB is supplying, it then subtracts the current that the non essential loads are drawing, then if there ia balance left over, the inverter then supplies back to the mains the same amount of left over current which the non essential loads are pulling.
If there is too much PV energy, the inverter pulls back so that the current drawn from the supply is zero Amps.
If there is insufficient PV power to supply all the non essentials are using, then the inverter will supply what it can to your non essential loads, and the balance will be from the mains.

All in all your are still saving on this extra energy which other inverters can not do.

[skatingsparks]

Bidirectional inverter - like installing a suicide cord for a generator? How do the protective devices work if the flow in in reverse?

Triple fail safe on on any inverter that back feeds - They will have 'Anti Islanding' - google it.

[Justloadit]

Triple fail safe on on any inverter that back feeds - They will have 'Anti Islanding' - google it.

Correct, I never mentioned the anti-islanding. If there is no mains, then there will be no bidirectional facility.
Not only that, if there is a power failure, all the loads that are currently connected to the mains connection, all the way up to the transformer would be 'huge', which would trip any small system attempting to back feed to the mains.
Irrespective, all these inverters have circuitry to detect when there is a mains failure and will disconnect the inverter via a DPDT internal relay.