How does Axpert bypass work? Does it mean the full mains can be powered without interrupting the inverter? Or is that load limited by the maximum power rating of the inverter? What can cause the inverter to go to overload when there is no loadshedding? 

11 minutes ago, Tim003 said:

How does Axpert bypass work? Does it mean the full mains can be powered without interrupting the inverter? Or is that load limited by the maximum power rating of the inverter? What can cause the inverter to go to overload when there is no loadshedding? 

The maximum the Axpert can bypass is still limited by its size. The PCB tracks cannot pass through 60A. Also the relays that do the bypass is limited to the rating of the inverter. 

It works just like any UPS would during grid on and grid off. 

A 3kw Axpert would trip it's thermal overload just over 3kw. This needs to be reset by hand. 

@BritishRacingGreen

did post the whole circuit during the last week. These relays also does the N to E bonding when running from battery in the versions after I think Mks2. 

Edited July 6, 20232 yr by Scorp007

Thanks @Scorp007

The manual shows the inverter can handle 150% of load for 5s before going into overload, that is 4500W for 24V 3000w inverter, is this the absolute maximum? Does it mean if I want to power multiple loads at once (kettles, microwaves, washing machine) I have to manually bypass the inverter thorough the changeover switch (by changing to Eskom)? 

 

Overload alarm starts at 110% of load which is 3300W for 24V 3000W...this is rather low 

Yes the 150% will just be to start things with motors and 5 sec is very short.

Yes you will have to transfer to grid to run kitchen appliances.

It is only recently that we have seen higher than inverter rating when on bypass like the Sunsynk 5kW that can do about 35A and the 8kW good for 53A.

Which other inverters are not as low as the Axpert?

12 minutes ago, Scorp007 said:

Which other inverters are not as low as the Axpert?

I'm running Victron Multiplus II 48V 3000VA and I never have an overload problem running multiple kitchen appliances. The datasheet shows 'maximum feed through current of 32A' and 'peak power of 5500W' but doesn't show how long it can endure these ratings. 

11 hours ago, Scorp007 said:

he maximum the Axpert can bypass is still limited by its size. The PCB tracks cannot pass through 60A. Also the relays that do the bypass is limited to the rating of the inverter.

Yes, and one must also remember if machine is in USB mode and grid is also charging  the battery, that adds to total grid current. 

BYPASS term has become a bit of a misnomer nowadays. Because the later machines are actually on-grid topology (bidirectional inverter), the grid is  connected to the load even in SUB mode while PV may be supplying the bulk or even the entire load. This is the topology required for AC blending where the gid is online in order to add the shortfall when pv cannot cope with total load requirement. Example a 4kW load gets 2.5kW from pv, and simultaneously 1.5kW from grid. So thats not entirely BYPASS mode, but the legacy terms has been retained. 

So grid is always connected in USB (hard bypass) and SUB ('partial' bypass)  and disconnected in SBU mode. In latter mode the grid will connect automatically though if both pv and battery are not available anymore, typically when battery becomes flat. 

Note also because the machine is bidirectional, the grid CANNOT charge your battery when in SUB and SBU modes, even if charge priority includes grid. 

 

Everything BritishRacingGreen said above is true. In my observation, in SBU mode the grid gets connected when the battery will reach the back to grid voltage. However this does not need the battery to be flat. In my case, 48V battery, Pylontech us5000x2. 100% can be reached as low as 51.5V. I have set the back to grid at 48V which can be touched if all of a sudden there is 70%-80% load on the inverter, like the water pump starting when the dishwasher is running, even if there is sufficient PV. The grid is connected briefly, the inverter switches from Solar/Battery to Hybrid (as indicated by Solar assistant), then when the surge has passed it will linger for a while (1-2mins) in Hybrid despite the voltage rise to above 50V (back to discharge setting in my case is 49V), and finally back to Solar/Battery.

Hi,
i have also a question about the Axpert King 5K. I have 3 of them running in 3Ph. Mode with SBU. My Problem is, that i can´t run it in Bypass mode. The only thing what work is Line mode, so  AC to DC and DC to AC . I also use solar assistant and there i also have no other mode for bypass.
Is this the problem of 3 phase mode or have anyone an idea to fix this.

18 hours ago, TwoFaceXX said:

My Problem is, that i can´t run it in Bypass mode.

Weber and I tried to understand all the various King settings last Friday, and failed utterly.

I assume you have fiddled with the bypass, operation logic, and charge source priority settings.

I have no experience with 3-phase, so I don't know if this is compounding your problem or not.

Hi,

settings

1. USB -> so, utility first

10. ECO -> so, bypass when utility available

23.BYE-> bypass enable

but didn´t work. the only thing what i didn´t test was without 3 phase mode because therfore i must uninstall the addon platine´s in the inverter. But i have build around the inverter air ducts for better cooling and don´t want to remove them.

20 hours ago, TwoFaceXX said:

i have also a question about the Axpert King 5K. I have 3 of them running in 3Ph. Mode with SBU. My Problem is, that i can´t run it in Bypass mode

Bypass(ECO) mode is not available on paralleled Kings.  This is mentioned in a version of the manual available on the AEVA site. (USER’S MANUAL (mppsolar.com see bottom of page 29)

Edited August 1, 20232 yr by Calvin

OK thanks. That's not written in my manual, then I'll probably install an automatic switch. The standby consumtion is to high in winter without sun.

On 2023/08/01 at 5:05 PM, Calvin said:

Bypass(ECO) mode is not available on paralleled Kings.

On 2023/08/01 at 7:18 PM, TwoFaceXX said:

That's not written in my manual,

Actually, I think that you can have bypass mode with paralleled Kings, but it's not then called ECO mode.

Edit: I'm basing this on some weird code in the King DSP firmware that tries to drive an old-style display. Maybe it's actually active in a Rack Mounted King. The old displays have separate icons (LCD segments) for ECO and BYPASS, and ECO is only ever displayed if there exists only one machine (none paralleled or 3-phased). Since this code is never actually drives a display (except perhaps for the Rack Mounted Kings), this may not be a valid point.

Edited August 4, 20232 yr by Coulomb

7 hours ago, Coulomb said:

Actually, I think that you can have bypass mode with paralleled Kings, but it's not then called ECO mode.

Hi @Coulomb,

Like you and Weber, I have spent many hours trying to understand the settings and terminology of these inverters (also with limited success 😑).

I would be very happy if I am wrong, but I have never found any difference between ECO and Bypass modes on the King.  Irrespective of the terminology, my 3 Kings (parallel single phase) always power the loads from the inverter stage.

The settings that make it bypass as a standalone simply have no effect when paralleled.

So, if you have any ideas about how this could be achieved I would be very happy to test it on my setup.

 

Edited August 4, 20232 yr by Calvin