I have a Hubble Am-2 on a hybrid 5.6Kw inverter. I noticed that when the grid goes off the battery level quickly drops to 94% but thereafter it seems to have normal discharge. During the day when solar is available, the same happens but it then stays at 94%. Whenever the grid returns it charges up back to 100% fairly quickly. Is this something I need to be concerned about, is it maybe caused by a setting?

The inverter settings is in line with the Hubble specs.

Perhaps a setting on your Inverter that allows you set a "Voltage point Back to Battery" and/or "Voltage point Back to Grid/Utility" that allows to manipulate the battery charge level to be maintained?

 

Thanks @zsde, none of those sound/look familiar to me and I went through all the settings to see if there is something that might point to this but I found nothing.

Is your setup with comms between BMS and Inverter in Lithium mode or are you using Voltage control mode?

5 minutes ago, zsde said:

Is your setup with comms between BMS and Inverter in Lithium mode or are you using Voltage control mode?

If I understand your question correctly @zsde , I use the User setting, i.e. I do not specify a specific battery type, so that I can override the float etc., so that is probably what you refer to as Voltage Control mode?

14 minutes ago, Anton64 said:

refer to as Voltage Control mode?

Correct, thats it, i.e. user mode.
Hubble has a host of Inverters that they provide the settings for. If your Inverter is part of that list and your results are unexpected then perhaps send them a mail to ascertain  what their suggestions are.
 

1 minute ago, zsde said:

Correct, thats it, i.e. user mode.
Hubble has a host of Inverters that they provide the settings for. If your Inverter is part of that list and your results are unexpected then perhaps send them a mail to ascertain  what their suggestions are.
 

As in my original post - the settings are correct as per the Hubble specs. No issue there.

6 minutes ago, Anton64 said:

No issue there.

Understand that. What I am suggesting is that you advise Hubble of your observed results so that they can confirm that it is normal or else investigate if they perceive it to be out of the ordinary.
From my own experience with Growatt, I eventually got confirmation from Growatt China that their algorithm actually runs the battery down to 95% and then recharges to 100% if in Li mode. Nothing the user can do about that except to apply Voltage control mode.

Edited April 25, 20233 yr by zsde

50 minutes ago, zsde said:

Understand that. What I am suggesting is that you advise Hubble of your observed results so that they can confirm that it is normal or else investigate if they perceive it to be out of the ordinary.
From my own experience with Growatt, I eventually got confirmation from Growatt China that their algorithm actually runs the battery down to 95% and then recharges to 100% if in Li mode. Nothing the user can do about that except to apply Voltage control mode.

Thanks I will try that

15 hours ago, Anton64 said:

If I understand your question correctly @zsde , I use the User setting, i.e. I do not specify a specific battery type, so that I can override the float etc., so that is probably what you refer to as Voltage Control mode?

Sounds like it's a normal voltage drop that's caused by load that the inverter reads as decreased SoC. Getting a perfectly accurate SoC reading from lithium batteries using voltage alone is near impossible. 

 

 

16 minutes ago, MeepMoop said:

Sounds like it's a normal voltage drop that's caused by load that the inverter reads as decreased SoC. Getting a perfectly accurate SoC reading from lithium batteries using voltage alone is near impossible. 

 

 

@MeepMoop Yes it is just too consistent not to be some predefined behavior. I'll continue investigating to find if there is some inverter or battery setting that is causing it.

Ok, just an update. I reached out to Hubble and got a response within minutes, very impressive. But basically what they said is that it is normal behavior and nothing to worry about. Thanks for all the comments, at least now I know it's not going to detonate

What are your following two settings?

1. Float

2. Battery Cut off, or Battery low voltage point (Not the low alarm Voltage)

40 minutes ago, Eurard said:

What are your following two settings?

1. Float

2. Battery Cut off, or Battery low voltage point (Not the low alarm Voltage)

Float = 53.6v

Low DC Cut Off = 44v

29 minutes ago, Anton64 said:

Float = 53.6v

Low DC Cut Off = 44v

Set your cut off at 43.4V

15 minutes ago, Eurard said:

Set your cut off at 43.4V

@Eurard Ok will do thanks. That is an odd number. Is there a specific reason?

Edited April 26, 20233 yr by Anton64

6 minutes ago, Anton64 said:

@Eurard Ok will do thanks. That is an odd number. Is there a specific reason?

The inverters are stupid lol.

Your previous settings:

[53.6v - (44+0.2)] x 10 = 94%

With that change it will be:

[53.6v - (43.4+0.2) x 10 = 100%

 

We litterally have the same settings, my float is also 53.6

Edited April 26, 20233 yr by Eurard

4 minutes ago, Eurard said:

The inverters are stupid lol.

Your previous settings:

[53.6v - (44+0.2)] x 10 = 94%

With that change it will be:

[53.6v - (43.4+0.2) x 10 = 100%

 

We litterally have the same settings, my float is also 53.6

Cool thanks man. I have changed it and will monitor it. For the money you'd think these things are moerse clever

3 minutes ago, Anton64 said:

Cool thanks man. I have changed it and will monitor it. For the money you'd think these things are moerse clever

No that would be Coulomb here, if it wasnt for his post, I would still be scratching my head.

 

Pleasure man, I know how bloody frustrating it can be seeing 100% and then 51%. For me thinking a cut off of 48V would be lekker. Lol