Good morning,

I really hope that someone can help me.  Firstly I would like to apologize if this has been covered before in this forum but I sometimes find it hard to find the right information with a snippit of info here and another snippit there.  Thus the reason I decided just to create a new post.  I have the following system and setup as follows:

SYSTEM:
Synapse 5.0K+ (Axpert King)
Firmware: 71.70
Pylontech 3000B
9 x 275W solar panels

WHAT I WANT SYSTEM TO DO:
Although utility is available, I would like to run my household (Load) on Solar Panels. If not enough power generated by panels, then I would like the battery to assist panels. If not enough supplied by both or battery falls to minimum level, I would like the Utility to kick in. I would like to have enough battery power to support load shedding if utility goes down. I would like solar to charge battery and support load if enough sun.

CURRENTLY:
If I switch the mains off or when load shedding, Inverter switches to Panels to support the load. It also switch to battery in the evening when there is no sun. I am happy, it works fine. Today is a bright sunny day, Panels generate at 11A and is enough to support household and no back from the full battery is required.

  

PROBLEM:
If I switch the mains on and the utility becomes available, the Pylontech shows as fully charged, the system somehow remains in Bypass mode and uses only the Utility power to support the household load demand. Nothing from the Battery or Solar Panels.

  
    
 

QUESTION:
How can I run my system on sun and battery as first priority and ONLY to use the Utility if there is no sun or when the battery is too low? Why does the system into bypass mode when the utility becomes available?  Currently I don't reap the benefit of solar when utility is available.

MY CURRENT SETTINGS:
01 -> SbU
02 -> 20A
05 -> PYL (works fine with cable)
06 -> Overload Enabled
07 -> High temperatures Enabled
09 -> 50Hz
10 -> ECO
11 -> 20A
12 -> 48v
13 -> 51v
16 -> SbL/ UCb
18 -> bOF
19 -> ESP
20 -> LON
22 -> AON
23 -> bYE
25 -> FEN
26 -> 53,2v
27 -> 53,2v
28 -> SIG
29 -> 47.0v
32 -> AUt
33 -> EdS
34 -> 58,4v
36 -> 60
36 -> 120
37 -> 30d
39 -> AdS
40 -> nfe
93 -> nfe
94 -> 10
95 -> 6
 

Thanks so much in advance.
 

3 hours ago, Japie Muller said:

  
PROBLEM:
If I switch the mains on and the utility becomes available, the Pylontech shows as fully charged, the system somehow remains in Bypass mode and uses only the Utility power to support the household load demand. Nothing from the Battery or Solar Panels.

Thank you for providing all the information to answer your question; it really is refreshing.

I don't operate a King yet; it's testing on the bench. But my understanding is that your problem is setting 10, operation logic. The dirty little secret about ECO mode is that it's really just bypass mode. How can they call that ECO? Well, if you're using utility power most of the time, it saves energy, because you don't do double conversion while in bypass mode. But you want to minimise utility usage, so that means ECO is not appropriate. You should try AUt or OnL; as long as your utility is clean and stable, these should do the same thing. Pick AUt because it's the default.

Once you've done that, it's possible that you may have to play with other settings, especially 01 and 16, to get it to do what you want. To make the most use of your King's hardware, I think you'll want SBU mode (setting 01). This will have the utility available, but don't panic, it's not in bypass mode (no BYPASS line), and it should only use utility power when needed, and as little as needed.

3 hours ago, Japie Muller said:

02 -> 20A

You could increase that to 30 A safely, charging the battery a bit quicker when you have good sun, and making more use of the panels when the loads are low.

I am facing the same problem. I am failing to switch off utility mode untill I restart the system. I am using SAKO inverter, on the user manual setting 10 is output voltage

On 2021/03/29 at 12:53 AM, SMI said:

on the user manual setting 10 is output voltage

Setting 10 (operation logic) is unique to the Axpert King (known by many names) only. Most Axperts don't have double conversion, which requires this setting.

What is your exact SAKO model? The sakopower.com website isn't responding for me today.

Edit: I got through via Google Cache. It looks like an Axpert King clone to me, which possibly explains the different meaning for setting 10. Maybe operation logic is just a different setting number?

Edited March 30, 20215 yr by Coulomb

This is an older thread, but I want to post about a recent discovery.

Most of the above problems are likely fixed with later firmware and appropriate settings.

However, it seems to me that when attempting to blend AC-in and solar, with a low battery voltage and high mains voltage, it will not be possible for the King to blend AC-in and solar. The problem rests with the PWM module module, which is unique to King models, is a boost converter. That means that the bus voltage is at least as high as the peak of the line voltage. The King is also a 64 V model, so the transformer turns ration has been turned down from 1:8 to 1:7. That allows for high voltage batteries like the flooded lead-acid Trojan batteries that require occasional equalisation at 64 V. But it means that for relatively low voltage batteries, in particular 15S LFP batteries like the Pylontech, the battery voltage is often around 50.0 V, and so the output of the DC-DC converter would be around 350 V.

But if the mains  happens to be over about 247 V (the exact value depends on several factors), then the bus voltage will already be at 350 V or more. There is no way that the DC-DC converter can push power into the bus. For the King 1 with the max 145 V PV, solar power goes directly to the battery, and can only support the load via the DC-DC converter. So it seems to me that in these conditions (high mains voltage, low battery voltage), the King 1 can't blend AC power with battery or solar power.

The King II (with 500 V max PV voltage) is different; it has a boost converter that boosts the PV voltage up to the bus voltage. But that means that any time that the PV voltage is higher than 7 times the battery voltage (around 350 V for a battery like a Pylontech, certainly by 54.0 x 7 = 378 V because the Pylontechs are 54.0 V max), the bus voltage will be too high for the battery to contribute power towards the load. This might mean that the King II will have to use utility power to make up any shortfall in solar power.

This is all theoretical. Those who use Kings and King IIs on a daily basis, I'd value your comments on what you experience. At the very least, this post may give you soe clues as to what to look out for if and when the King doesn't behave as you expect it to.

 

Edited June 9, 20233 yr by Coulomb