Growatt SPF5000ES Low voltage cut off can not be set higher than 45,9

[Hermanvanveen]

Hi people,

I would like to set the low voltage cut off to 48V. in order to keep the batteries in good condition.

Manual tells me it could be set from 42 to 48.
In reality the inverter does not let me set it higher that 45,9. If I set 46, 47 or 48 it changes it back to 45 when I press the enter button.

Does anyone have a solution for this?
I prefer not to deal with new firmware, since I've read some horror stories about people messing up their inverter with this.

many Thanks

Setup:
- Growatt SPF5000ES
- 8x 200 ah. Gel batteries in series of 4. (charge voltage acc. to supplier 14,4 - 14,9)
- No grid available

Used settings:
001: SOL
002: 50
003: GEN
004: dis
005: USE
006: dis
007: dis
008: 220
009: 60
010: 4
011: 30
012: 46
013: 54
014: SNU
015: ON
016: OFF
017: OFF
018: dis
019: 57,6
020: 55,2
021: would like to set 48

 

[MisterSandals]

Growatt SPF5000E

I’d put “Growatt SPF5000E” in your title to attract folks who know about them.

 

[Hermanvanveen]

I’d put “Growatt SPF5000E” in your title to attract folks who know about them.

Good suggestion. I just did.
Thx

 

[Mattb4]

I don't have the Growatt but on my Easun 3kw unit there are a few voltage settings that will act as you describe. I have to use my computer and monitor software from SRNE (different names but same inverter) and set the voltages with it. The one strange aspect is the monitor program reports the settings in 12v amounts instead of the 24v so I need to allow for that. For instance if I want Bat to Util at 25v, I enter 12.5v into the settings before writing to inverter.

 

[Hermanvanveen]

Unfortunately the unit did not came with a software disk. Still looking to find it online

 

[octal_ip]

Try adjusting setting 12 (B2AC) to something above 48v. It doesn't have any functional effect in your configuration, but it might then allow changing 21 to your preferred value as the two are related.

If you have no grid, you should probably also change 14 (charger source priority) to OSO.

220v/60hz is also an unusual combination for settings 8 and 9. Are you sure this is correct?

 

[Hermanvanveen]

Try adjusting setting 12 (B2AC) to something above 48v. It doesn't have any functional effect in your configuration, but it might then allow changing 21 to your preferred value as the two are related.

If you have no grid, you should probably also change 14 (charger source priority) to OSO.

220v/60hz is also an unusual combination for settings 8 and 9. Are you sure this is correct?

Thanks!
I will try your tips.

In Peru, we have 220 volt and 60hz.

 

[Hermanvanveen]

Thanks!
I will try your tips.

In Peru, we have 220 volt and 60hz.

It worked, thanks!

If I make OSO at setting 14, will I then stil be able to charge the batteries using a generator in case of very bad weather for days

 

[octal_ip]

It worked, thanks!

If I make OSO at setting 14, will I then stil be able to charge the batteries using a generator in case of very bad weather for days

No, if you have an AC input you'll need to use one of the other modes. SNU is a bit strange in the way it behaves, I haven't completely figured this one out.
CSO might do the job.

 

[Hermanvanveen]

Thanks

 

[Dskvid]

Watch this if you haven't it may help.

 

[Hermanvanveen]

I was wondering.
Imagine this scenario:

- night time
- battery resting voltage 50,0
- low cut off setting 48,0

When you apply a reasonable large load and the battery voltage drops temporary because of this load to 47,5. Does the inverter shuts down immediately, or does it take into account the heavy load and wait with shut down?

 

[octal_ip]

I'm not sure if Growatt have implemented a delay for their cutoff, it would be best practice (most BMS do this). Why not test and report back?

 

[remus74]

When you apply a reasonable large load and the battery voltage drops temporary because of this load to 47,5. Does the inverter shuts down immediately, or does it take into account the heavy load and wait with shut down?

I have that question too.