May I ask what the 154 means on the data plate of this battery. When i opened it up i found 30AH cells in pairs on one model and 130AH single cells in the other. The manufacturers data sheet for these cells shows a capacity below that suggested of 8 kilowatts. Has anyone else observed this anomaly?

4 hours ago, GeorgeP7 said:

May I ask what the 154 means on the data plate of this battery. When i opened it up i found 30AH cells in pairs on one model and 130AH single cells in the other. The manufacturers data sheet for these cells shows a capacity below that suggested of 8 kilowatts. Has anyone else observed this anomaly?

They sure makes one belief it is the Ah value. At the rated voltage of 52V that will give a 8kWh size. If indeed the cells are only 130Ah the the size should reflect as 6.7kWh?

Bluenova codes normally give the 2nd last figure as the Ah an the last figure as the capacity in Wh or kWh depending on size of the battery. 

Edited May 12, 20242 yr by Scorp007

22 hours ago, GeorgeP7 said:

May I ask what the 154 means on the data plate of this battery. When i opened it up i found 30AH cells in pairs on one model and 130AH single cells in the other. The manufacturers data sheet for these cells shows a capacity below that suggested of 8 kilowatts. Has anyone else observed this anomaly?

I think you would get this when opening some makes lfp batteries and won't say all but you will never know as opening will void the warranty. I made the same discovery when opening N-Energy 24v 2.5kwh battery module found 80ah eve cells load test sticker 71ah instead of 100ah cells and the worst part they where 2nd life cells. In your case the cells should have been 160ah instead of 130ah. You just don't know the capacity when purchasing any lfp module so in many cases people are ripped off. Very sad.

 

Thanks for your input. Let me include the photos of the cells in the two different packs i have been involved with. I was called by a customer complaining about the state of charge on his Blue Nova. On investigation of the four year old battery i found a few things that did not add up.

The data plates of the customers two batteries are the same but the internal structure is different as you can see from the photos attached. 

I am getting the data sheets for the cells from the manufacturer later today. Will post what info i get.

Here are the data sheets for the Thunder Sky Winston battery internal to the Blue Nova.

Thunder Winston Cell 130AH.pdf Thunder Winston Cell 60AH.pdf

48 minutes ago, TaliaB said:

I think you would get this when opening some makes lfp batteries and won't say all but you will never know as opening will void the warranty. I made the same discovery when opening N-Energy 24v 2.5kwh battery module found 80ah eve cells load test sticker 71ah instead of 100ah cells and the worst part they where 2nd life cells. In your case the cells should have been 160ah instead of 130ah. You just don't know the capacity when purchasing any lfp module so in many cases people are ripped off. Very sad.

 

For the cheap Nenergy one can accept it but not from Bluenova. 

Then we see the problems reported about some Hubbles yet my 2nd life 12V cells have a capacity higher than quoted even after 2yrs.

I have noticed a number of 2nd life batteries on the market. Blue Carbon, the very large blue and white case, 24 and 51.2v, are recycled EV automotive BYD cells. The cells are very large and would appear to be high current but marketed at 150AH. The problem comes when the battery fails and backup service is not forthcoming because the retailer wont contact the Chinese manufacturer. The failure tends to be the BMS not the cells. Easy to fix in this case.

If your cells are larger than the stated battery pack size and repurposed then you are fortunate as they should last many years. That's assuming the repurposer did their due diligence when measuring the state of health of the cell.

3 hours ago, GeorgeP7 said:

I have noticed a number of 2nd life batteries on the market. Blue Carbon, the very large blue and white case, 24 and 51.2v, are recycled EV automotive BYD cells. The cells are very large and would appear to be high current but marketed at 150AH. The problem comes when the battery fails and backup service is not forthcoming because the retailer wont contact the Chinese manufacturer. The failure tends to be the BMS not the cells. Easy to fix in this case.

If your cells are larger than the stated battery pack size and repurposed then you are fortunate as they should last many years. That's assuming the repurposer did their due diligence when measuring the state of health of the cell.

One thing I normally look at is the weight. Some 100Ah 12V are far lighter than say the Hubble I have and using the same case. 

Yeah. BlueNova is questionable- read about my 7 years of failures with BN :https://www.facebook.com/share/p/1EfpoteQjc/