Discharging Setting is not working

[ericlyuhui-ai]

Hi Stanus74,
Thank you for the SAJ-H2-Modbus tool. It is great.
I am new here and do not know much. Please help me on the below.

I recently had a SAJ H2-10K-T2 installed together with a B2 battery.
I have been trying to set up the automation to get the battery discharge based on Dynamic export pricing.
After I set up the automation via changing Discharging setting with power output level, it was working fine for a couple of days.
And then, the below happened.

The discharging function seems stopped working. It shows as 100% power but the battery is not discharging.
Not sure what went wrong and how to make it work again

In the screenshot, it shows that the discharging power is 100%, Discharging is enabled but the battery is charging instead of discharging.

It seems that the system is now stays as Self consumption mode although the Discharging Control is on.
In SAJ app, the battery is also showing as Time-of-use Mode. This should work, right?
Have I done something wrong?

All your helps are highly appreciated.

Regards
Eric

[ericlyuhui-ai]

Before I tried to use discharge power level to control battery, I also tried the passive discharging method. I could not have it work. Not sure if I had all boxes ticked right.

[ericlyuhui-ai]

By the way, the discharge depth was set to 8%. In screen shot, battery SOC is at 27%. Battery discharging is not limited to this.

[ericlyuhui-ai]

Please see the screenshots from SAJ APP as well.

[ericlyuhui-ai]

a quick update. I believe my setting of negative pricing might be the reason. I am not 100% sure. It is a maybe.
I do not know how to control it other than manually change the rate in SAJ APP. I will wait till the sun is down to see if the export resume after manually make the export price showing as positive.
Will update here after that.

BTW, I am in Sydney Australia. Sun will go down in 10 hours after this post.

[cryptominerht]

Discharging is a challenge. I am also in Sydney and I am also using Amber. I found that making it charge the battery at full power using passive mode worked for me. but i am yet to get it working with discharging.

[stanus74]

Thanks for the detailed description and screenshots.

One very important prerequisite is often overlooked:

➡️ In the SAJ eSolar SET app, under Working Mode,
“Battery exports to the grid” must be explicitly enabled.

If this option is not active, the inverter will never discharge the battery to the grid, even if:

• Discharging power is set to 100%
• Discharging is enabled in Home Assistant
• Modbus registers are written correctly

In addition:

• If the SAJ app is using automatic / AI-based control, dynamic pricing, or negative export prices, the inverter’s internal logic can override manual Modbus control.
• In that case, Home Assistant can still write the registers, but the inverter will simply ignore them.

⚠️ Note:
It is generally not recommended to charge or discharge the battery at 100% power on a regular basis. Lower power levels are usually better for battery health, efficiency, and long-term lifespan.

Important clarification:
My integration does write the corresponding Modbus registers. If these writes are successful — which can be verified directly in the SAJ eSolar app — and the inverter still does not behave as expected, then the issue is not caused by the integration, but by SAJ firmware or app-side logic.

Please double-check:

1. Working Mode → “Battery exports to the grid” = enabled
2. No conflicting SAJ app automation (AI / TOU / pricing logic)
3. No restrictions due to negative export pricing

If it still doesn’t work after disabling SAJ’s automatic control and enabling battery export, we can investigate further.
In most cases like this, the limitation comes from SAJ firmware or app behavior, not from the integration.

Best regards

[ericlyuhui-ai]

Thanks stanus74 for the reply. Really appreciated.
It is the negative export pricing constraint the export. All I know is how to manually amend the price to make it match the dynamic pricing from my electricity provider at the moment.

May I ask how to use own supplier dynamic pricing (via the automatic/AI-based control? maybe)?
My electricity supply provides API for pricing which imported to HA with no problem. However, I could not figure out how to import the price to SAJ APP or web portal.

Could you provide me with a hint?

Thanks
Eric

[cryptominerht]

Also you should disable your the time of use, and it should work. I had the same problem before. Or check your value for Battery Discharge Power Limit (Input). If you have it at 0 and on time of use mode. The battery will not discharge

[ericlyuhui-ai]

Do you mean that I should change the mode? If it cannot be time of use mode, do I need to change it to self consumption mode?

[cryptominerht]

Yes, use HA to change the APP Mode to 0.

[ericlyuhui-ai]

Thank you. I will try tonight.

[ericlyuhui-ai]

Hi Cryptominerht,
I tried just now. Somehow it is not working.
I have the APP mode changed to 0, Discharge control disabled, discharge time lot unticked, SAJ Solar export limit set to 1100 and export limit in Esolar APP enabled.
However, Battery is still not discharging.

is there anything else should be amended?

Thanks

[bierma1966]

Have you tried to clean your browser cache before you make your test ?
.
Try to test following:
Enable dicharging time slot 1
Set time from 1:00 to 23:00
Power 50%

Check if APP mode is chanded
Open the elekeeper APP and check if the values are changed at the Inverter site.

[cryptominerht]

You want to discharge the battery. You need to set to APP mode 1, and set the time and discharge rate. At the moment, you have solar more than your consumption and it is exporting , your battery of course not discharging.

[ericlyuhui-ai]

There is a bit of confusion here.
I am trying to control the PV output and battery discharge at the same time.

When Export price is good, I want PV to generate as much as possible and export it all. This function is current limited by the Australia Dynamic price used by APP. (When Amber price is good but Price APP is using shows differently, PV will stop working. vice versa).

I was trying to turn on Export/Generation Limitation Settings in eSolar APP and control export that way. it seems to be working during the day but Battery will not discharge at night.
As I can only change this export control setting via Bluetooth connection and I cannot always stay close to inverter, automation cannot be done.

I am currently using discharge time and power to control export based on Amber pricing. But this seems to limit export to maximum of SAJ invertor's maximum power. What I mean by saying that? let me explain a little further.

I have a pre installed system and current SAJ is Hybrid Coupled to the old system.
When SAJ is on Self consumption model and SAJ export price is positive, PV panels will work up to SAJ inverter's max power and export will equal to SAJ PV output + old system PV out put.
When SAJ is on Time of use mode, Total export will be limited to SAJ inverter's max output regardless. For example, SAJ PV can generate 15KW, old system can generate 8KW, total output under self consumption mode will be 15KW + 8KW = 23KW. but Time of use mode will generate 10KW only which is the inverter max output by spec.

So, what I am trying to achieve is to control SAJ PV output based on Amber's price not the price in SAJ App. At the same time, I want to be able to control battery's discharge as well.

Sorry for such a long one.

[stanus74]

Hi Eric,

Thanks for your detailed explanation – you're clearly putting a lot of thought into this!

From what you've described, there are two major points that could explain the behavior you're seeing:

---

1️⃣ Hardware Limitation of the SAJ Inverter

Your inverter model (H2-10K-T2) has a maximum output capacity of 10 kW (AC).

This means that the combined total of:

• Grid export,
• Household consumption,
• Battery charging/discharging
  must never exceed 10 kW at any given moment – this is a physical hardware limit, not a software setting.

Example:
If your household is consuming 3 kW, only 7 kW are available for battery charging or grid export.

Even if your PV array is generating 15 kW and your battery is ready to discharge, the inverter cannot process more than 10 kW total.

This also means that if your old PV system is connected separately and feeds into the grid independently, only that system can contribute to higher export – the SAJ inverter will always cap at its rated 10 kW.

---

2️⃣ Internal SAJ Logic / External Control

The SAJ inverter firmware and app logic can override external control via Modbus or Home Assistant, especially if:

• You're using Time-of-Use mode, AI control, or Dynamic Pricing in the SAJ app
• The SAJ app receives a different price signal than Amber (or interprets it differently)
• The export price is negative, or below a threshold that blocks discharging/export

Even if Home Assistant writes the correct Modbus values (e.g., discharging power = 100%), the inverter may ignore those commands if it decides – based on its own logic – that export is not allowed.

This is why you may see:

• Battery showing "discharging = 100%" but still charging
• No export, even when your Amber automation says it should export
• Unexpected fallback to "Self-Consumption" behavior

---

🔄 Suggested Actions

• In the SAJ eSolar Set App, verify:
  • "Battery export to grid" is enabled
  • APP Mode = 1 (Manual Time Control)
  • No internal pricing automation is active
• Make sure the export price in the SAJ app is not negative
• Consider reducing discharge power to 50–80% instead of 100% for battery health and better stability

---

Unfortunately, there currently doesn’t seem to be a way to inject Amber pricing directly into the SAJ system (e.g., via API). That means your HA automation is "fighting" against the internal logic of the inverter.

Until SAJ exposes a pricing API or full external control is possible, you may be limited to:

• Manual price adjustment in the app
• Or fully disabling SAJ's internal control and relying only on scheduled discharging

Let me know if that helps – happy to assist further if needed!

Best regards,

[cryptominerht]

"When Export price is good, I want PV to generate as much as possible and export it all. This function is current limited by the Australia Dynamic price used by APP. (When Amber price is good but Price APP is using shows differently, PV will stop working. vice versa)." This is the problem. as I said in my earlier reply, you have to switch it off and manually using the export limit input to control Grid export. as soon as you have that Negative pricing thing enabled in the APP, you lost control of your inverter.

[ericlyuhui-ai]

Hi Cryptominerht,
thank you for replying me so many times.
I know what you have been trying to tell me but I could not make it work somehow.
There must be something that I missed. I will check again when I can.

Regards
Eric