Good afternoon and thanks for your help.

I have this inverter with 2 x 5kW (200Ah) lipo batteries.

A month or so you guys helped me to change the settings so that I can get the best economics out of my setup. It makes a noticeable difference on electricity consumption.

Here are the settings:

• 1 : SOL

• 12: b2AC - 25%

• 13: AC2B - 70%

• 14: OSO

This means the batteries only charge to 75%. We battle in our area with unexpected power outages. This has happened at, let's say 16:00 and power only came back on the next day.

In the light of this, I need to be able to randomly, because we never know when it happens, to have the batteries fully charged by 17:00. I am battling to find the correct settings for this. When I got the inverter I remember I had setting 1 on SBU or SOL; I cannot remember. It changed over to the batteries and solar till the sun sets and utility charged it to 100%.

But now I cannot get the inverter charging the batteries past 79%. And there is no setting with that value. Will you kindly please help me with the correct settings to have the batteries charged to 100%? 95% is also good.

Thank you very much.

23 minutes ago, deonholt said:

Good afternoon and thanks for your help.

I have this inverter with 2 x 5kW (200Ah) lipo batteries.

A month or so you guys helped me to change the settings so that I can get the best economics out of my setup. It makes a noticeable difference on electricity consumption.

Here are the settings:

• 1 : SOL

• 12: b2AC - 25%

• 13: AC2B - 70%

• 14: OSO

This means the batteries only charge to 75%. We battle in our area with unexpected power outages. This has happened at, let's say 16:00 and power only came back on the next day.

In the light of this, I need to be able to randomly, because we never know when it happens, to have the batteries fully charged by 17:00. I am battling to find the correct settings for this. When I got the inverter I remember I had setting 1 on SBU or SOL; I cannot remember. It changed over to the batteries and solar till the sun sets and utility charged it to 100%.

But now I cannot get the inverter charging the batteries past 79%. And there is no setting with that value. Will you kindly please help me with the correct settings to have the batteries charged to 100%? 95% is also good.

Thank you very much.

Change 14 to SNU if you have this setting.

See if you have a SUB on setting 1.

I would rather not guess 13 as it seems like Growatt use letters to describe the function and I am not sure.

Take these as a starting point. May be @zsde can help you out.

3 minutes ago, Scorp007 said:

Change 14 to SNU if you have this setting.

See if you have a SUB on setting 1.

I would rather not guess 13 as it seems like Growatt use letters to describe the function and I am not sure.

Take these as a starting point. May be @zsde can help you out.

Hi. Yes, 14 has SNU. Setting one has SOL, SBU, SUB and Uti. I will change all accordingly. Thanks for your time & help.

56 minutes ago, deonholt said:

Hi. Yes, 14 has SNU. Setting one has SOL, SBU, SUB and Uti. I will change all accordingly. Thanks for your time & help.

Set 19 Bulk charge voltage to 100%

I my case I run my system on voltage settings ((setting 5 on USE mode)

I charge my battery 16 cells to 56 V, float at 53 V see attached

Edited November 13, 2025Nov 13 by Antonio de Sa

Can we assume you are running Li-BMS, i.e. the BMS sets your vital parameters?
What is your max charge current set to in program code 02? Could it be that your Inverter is set to a single battery max charge? If it is, the charge rate may limit a potentially higher charge, i.e. throttle available solar energy unnecessarily
If 14 is set to OSO, then it will only ever charge from Solar.
If your battery only gets to around 75%, then it could be that your daily solar production may be insufficient to recharge the used battery energy.
Perhaps you can monitor your typical morning SOC and then check your day's solar production. Do your calculations and see if the production is enough to recharge the consumed energy.

On 2025/11/14 at 8:27 PM, zsde said:

Can we assume you are running Li-BMS, i.e. the BMS sets your vital parameters?
What is your max charge current set to in program code 02? Could it be that your Inverter is set to a single battery max charge? If it is, the charge rate may limit a potentially higher charge, i.e. throttle available solar energy unnecessarily
If 14 is set to OSO, then it will only ever charge from Solar.
If your battery only gets to around 75%, then it could be that your daily solar production may be insufficient to recharge the used battery energy.
Perhaps you can monitor your typical morning SOC and then check your day's solar production. Do your calculations and see if the production is enough to recharge the consumed energy.

Hi again. I have not sorted this out completely.

Battery type, setting 05 = Li 005

I need to force the inverter to charge my battery to 95%. I have two x HINA ESS Hi-5 5kW batteries but disconnected one for this. I am only running one and see if I can force the inverter to charge it to 95% in setting 13. For some reason I don't understand it doesn't go past 81%.

Settings:

• 01: SUB (for some reason the charging keeps switching between Charging and Batt output)

• 02: Max AC Charge current: 60A

• 12: B2AC : 35%

• 13: AC2B : 95%

• 14: SNU

I need to change the settings no charge the battery to 95% as first priority and it can use solar/and or utility, as long as charging is the first priority.

I will appreciate it if you can assist in pointing out what I am doing wrong.

Much appreciated.

6 hours ago, deonholt said:

Hi again. I have not sorted this out completely.

Battery type, setting 05 = Li 005

I need to force the inverter to charge my battery to 95%. I have two x HINA ESS Hi-5 5kW batteries but disconnected one for this. I am only running one and see if I can force the inverter to charge it to 95% in setting 13. For some reason I don't understand it doesn't go past 81%.

Settings:

• 01: SUB (for some reason the charging keeps switching between Charging and Batt output)

• 02: Max AC Charge current: 60A

• 12: B2AC : 35%

• 13: AC2B : 95%

• 14: SNU

I need to change the settings no charge the battery to 95% as first priority and it can use solar/and or utility, as long as charging is the first priority.

I will appreciate it if you can assist in pointing out what I am doing wrong.

Much appreciated.

If you change only AC2B from 95 to 100% see if it still stops charging at 81%.

8 hours ago, deonholt said:

Hi again. I have not sorted this out completely.

Battery type, setting 05 = Li 005

I need to force the inverter to charge my battery to 95%. I have two x HINA ESS Hi-5 5kW batteries but disconnected one for this. I am only running one and see if I can force the inverter to charge it to 95% in setting 13. For some reason I don't understand it doesn't go past 81%.

Settings:

• 01: SUB (for some reason the charging keeps switching between Charging and Batt output)

• 02: Max AC Charge current: 60A

• 12: B2AC : 35%

• 13: AC2B : 95%

• 14: SNU

I need to change the settings no charge the battery to 95% as first priority and it can use solar/and or utility, as long as charging is the first priority.

I will appreciate it if you can assist in pointing out what I am doing wrong.

Much appreciated.

The answer to your problem lies with the post from @Antonio de Sa your bms communication between the Hina and Growatt is not working correctly. Most probably packets being dropped in your communication protocol. Your issue is not AC2B or B2AC. Those are changeover thresholds, not charge targets.

In Li mode the Growatt obeys the battery BMS, and if comms or SOC calibration is off, charging will stop around 80–82%.

The reliable fix is to switch battery type to USE, set correct bulk/float voltages for the Hina batteries, and run SBU mode. This removes BMS charge blocking and allows full 100% charging.

Edited January 2Jan 2 by TaliaB
Spelling

If you want to use Can or RS485 communication check your existing comms cable to the HINA ES diagram.

Hina manual link below.

https://jcsolarpanels.co.za/wp-content/uploads/2024/06/HinaEss-PowerGem-5.12kWh-Battery-User-Manual.pdf

14 hours ago, Scorp007 said:

If you change only AC2B from 95 to 100% see if it still stops charging at 81%.

Thanks. I changed it to 100% and it now sites at 85%. What bugs me is that it still uses battery even though I have setting 1 (Output source priority) at UTI.

I will keep on trying.

12 hours ago, TaliaB said:

If you want to use Can or RS485 communication check your existing comms cable to the HINA ES diagram.

Hina manual link below.

https://jcsolarpanels.co.za/wp-content/uploads/2024/06/HinaEss-PowerGem-5.12kWh-Battery-User-Manual.pdf

Thanks for the reply.

1. I use the cable supplied by HINA.

2. The only think I am not 100% sure about, is the protocol for the battery. I will keep on searching.

Thanks very much.

22 hours ago, TaliaB said:

The reliable fix is to switch battery type to USE, set correct bulk/float voltages for the Hina batteries, and run SBU mode. This removes BMS charge blocking and allows full 100% charging.

I was very hesitant to suggest USE like I and @Antonio de Sa are using if one can use the more accurate method via comms cable but for sure it's worth a try.

47 minutes ago, Scorp007 said:

I was very hesitant to suggest USE like I and @Antonio de Sa are using if one can use the more accurate method via comms cable but for sure it's worth a try.

Thanks for the reply. In my head, and maybe it is because I am wired like that: If the book/manual recommends something, I lean towards that rather that something else. So, the question in my head: "By changing battery type to User, will it not be less efficient than choosing Lithium and let the inverter's BMS handle the charging of the battery?" I have two Hi-5 batteries but disconnected the one to first see if I can find the problem with one, resolve it and then connect the other again. By changing battery type to "Use", will I still need the coms cable between the batteries themselves and between the batteries and the inverter?

I really appreciate your time and help together with @Antonio de Sa . Thanks very much.

17 minutes ago, deonholt said:

By changing battery type to "Use", will I still need the coms cable between the batteries themselves and between the batteries and the inverter?

No remove the communication cable between battery and inverter and also the communication between the 2 batteries. Are you using RS485 or Can? What protocol is program 36 set to currently.

On 2026/01/02 at 9:10 PM, TaliaB said:

The answer to your problem lies with the post from @Antonio de Sa your bms communication between the Hina and Growatt is not working correctly. Most probably packets being dropped in your communication protocol. Your issue is not AC2B or B2AC. Those are changeover thresholds, not charge targets.

In Li mode the Growatt obeys the battery BMS, and if comms or SOC calibration is off, charging will stop around 80–82%.

The reliable fix is to switch battery type to USE, set correct bulk/float voltages for the Hina batteries, and run SBU mode. This removes BMS charge blocking and allows full 100% charging.

Good morning.

Just some feedback. I changed the Batt Type to USE and changed charging & floating voltages as suggested and removed the COMS cable. Battery shows 100% and everything seems good.

Thank you very much for your patience & help. Mush appreciated.