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Battery voltage does not make sense


MalDyl

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So I have a Must branded 1000W inverter connected to a 12V First Life04 Hubble 100ah battery, think its a s100a model. Bought brandnew at end of January 2023(bought this from Geewiz.co.za) 

Firstly I had issues with high voltage readings I contacted Hubble as Geewiz lithium setting were incorrect. Hubble gave me the correct settings as followed.

 

Bulk - 14v

Float - 14v

Cutoff - 12v

After those settings inverter worked awesome. We only use the inverter for the TV and soundbar so it’s doesn’t pull as much load. I decide I’m just going to do a run test on how long this battery can infact last so I did add a bit of load by playing Xbox.

after 2hours I get a error 04 which means low voltage. What just doesn’t make sense is the Cut off Voltage is set to 12V but according to the picture I’ll be adding this doesn’t make sense at all as battery is reading 12.9V but error 04 low voltage is displaying a continuous beeps are made.

 

battery indicator still shows full 4 bars which is just weird.

IMG_0063.thumb.jpeg.87ed3173507ed2082499fd3e98b4a876.jpeg

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Think 04 is an low battery warning and is realated to the 12v cut off volts . It's seems these inverters software has been written for gel or lead battery so it starts warning around 1 volts before set cut off volts witch is okay for lead or gel but run it  you could get another hour +  more  before the inverter shuts down . Normally I ignore this low voltage warning on lithium battery if I know my cut of volts are around 20%  but am aware  that the lithium is one volts from shut down . 

 

In the inverters setting I disable the beeps so the low volts warning beeps don't irritate us . 

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39 minutes ago, GMAC said:

Think 04 is an low battery warning and is realated to the 12v cut off volts . It's seems these inverters software has been written for gel or lead battery so it starts warning around 1 volts before set cut off volts witch is okay for lead or gel but run it  you could get another hour +  more  before the inverter shuts down . Normally I ignore this low voltage warning on lithium battery if I know my cut of volts are around 20%  but am aware  that the lithium is one volts from shut down . 

 

In the inverters setting I disable the beeps so the low volts warning beeps don't irritate us . 

Ah okay this could make sense. I disabled the beep as it’s annoying as hell. What kinda also bothered me my Float and bulk is set to 14V but my battery was showing 13.4V which is fine the other issue though I was using the system for 20 mins with 20A load on the system my battery was then showing 13.1V is this probably fine? What I read about LifeP04 is 13.4V = 99% capacity. 13.1V = 40%, how did I loose 59% capacity within 20 mins with just 20A being bulled?

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4 hours ago, MalDyl said:

Ah okay this could make sense. I disabled the beep as it’s annoying as hell. What kinda also bothered me my Float and bulk is set to 14V but my battery was showing 13.4V which is fine the other issue though I was using the system for 20 mins with 20A load on the system my battery was then showing 13.1V is this probably fine? What I read about LifeP04 is 13.4V = 99% capacity. 13.1V = 40%, how did I loose 59% capacity within 20 mins with just 20A being bulled?

 

My my setup is similar to yours but 24v system and also had no idea what the real soc is lucky I'm in the radio control hobby for years and had an watmeter so I used it in the beginning to get an better idea of soc to volts using this meter as it connect between lithium and inverter and shows volts and wats as well as ah used so worked great to give me a good idea of what's really going on .

But don't leave the watmeter connect permanently if you do decide to buy one at you local hobby shop as these meter were never ment to run 24/7

This is the best advice I can give you to get the best idea what's going on 

IMG_20230402_225000.jpg

Edited by GMAC
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