Battery SOC minimum %

wingnut771 said:
Exactly, so make hay while the sun shines. Also why you should build DIY version so one can replace components if need be.
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I get DIY but are there failures on the BMS where the batteries get over charged or discharged? A DIY bank won’t save you but it will help a ton with ease of replacement.
 
denmendez65 said:
And also where do you get 20 years from? Every battery I see online, even Freedom won, says 2000 cycles at 100% DOD.

Thats 5 years only. A person with 20kWh of battery would have only 16kWh. And it’s a downward spiral from there.

I do see others saying 3000 cycles. But on average I see 2000.

Keep in mind this is in ideal situations at 25 degrees. For every 10 degrees over you shorten the life even more. So the 2000 cycles will be some 1800 or so.

Then there is C rates. Is the person using it at the recommended C rate? So that can go even as low as 1500 cycles.

I think Lupus said his boss was running his batteries down to 0 all the time and his boss had to replace them in 3 years.
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Freedom won sucks then:
1766141851941.png
 
I've set mine to 20%.
Pack 1 is 1 year old, Pack 2 is about 6 months old. Both are in a good state.
Cyclone F5's.
1766141858603.png
 
wingnut771 said:
Freedom won sucks then:
View attachment 1872305
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I don’t know hey. AI? And how does one put this to the test. And see the extra “Provided terms are met”.

There is a whole thread on Powerforum about Plyontechs failing and warranties not being honoured.

And they pick on those terms. Guys fiddle with charge settings (alter the default) and claim is denied etc.
 
wingnut771 said:
Any JK examples?
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I haven’t checked for JK. But electronics are electronics at the end of the day. I feel data is very limited and we only going with what datasheets and manufacturers are telling us.

Is the warranties on the BMS? I feel there is no way a BMS will last 10 years. If yes, it will be few and far between. So the practical limit of the Lithium chemistry is never going to be really met.

Unless you are lucky the BMS just dies and you can replace it. And it doesn’t take out your cells with it.

In cars, yes. The BMS do seem to last 10 years. I don’t know if residential is built to the same standard
 
denmendez65 said:
I don’t know hey. AI? And how does one put this to the test. And see the extra “Provided terms are met”.

There is a whole thread on Powerforum about Plyontechs failing and warranties not being honoured.

And they pick on those terms. Guys fiddle with charge settings (alter the default) and claim is denied etc.
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Exactly why you spend as little as possible as most batteries are impossible to repair or go DIY. Pylontech is also 15S battery so that makes sense people putting in 16S settings and overcharging.
 
Pylontech also is potch cells they are kinda the only one sticking with it? Also vs how many batteries sold in SA on other brands. I don't really see that much of complains. We shall have to see in 10 years.
 
denmendez65 said:
I haven’t checked for JK. But electronics are electronics at the end of the day. I feel data is very limited and we only going with what datasheets and manufacturers are telling us.

Is the warranties on the BMS? I feel there is no way a BMS will last 10 years. If yes, it will be few and far between. So the practical limit of the Lithium chemistry is never going to be really met.

Unless you are lucky the BMS just dies and you can replace it. And it doesn’t take out your cells with it.

In cars, yes. The BMS do seem to last 10 years. I don’t know if residential is built to the same standard
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Yes, so don't worry, **** happens, just keep soldiering on and take it on the chin if something happens.
 
Most R10k batteries is just 16s pacebms. might as well buy them and used them till they die like people said
 
Yeah. For prebuilt batteries I agree. I wouldn’t piss money on expensive ones. Only if doing DIY.
 
DTBA said:
Pylontech also is potch cells they are kinda the only one sticking with it? Also vs how many batteries sold in SA on other brands. I don't really see that much of complains. We shall have to see in 10 years.
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That’s the thing. How many go on forums and tell their story? We don’t know how many failed out there. We can only see on MBB and Powerforum.
 
Pace doesn’t have individual balancing I believe? So chances are there is a hard limit on the DOD. Maybe 95%? If you go to 100 you run the risk of your cells not being balanced.

Then you have to rely on the over voltage charging thing people talk about here.
 
One thing to note is all the cheap batteries just chuck the pace bms in with default settings at 58.something charge voltage.

That is on the high side.

adjusted my pacebms to battery full at 55.5 and charge at 56.0
 
denmendez65 said:
Pace doesn’t have individual balancing I believe? So chances are there is a hard limit on the DOD. Maybe 95%? If you go to 100 you run the risk of your cells not being balanced.

Then you have to rely on the over voltage charging thing people talk about here.
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JK is the only BMS without any flaws.
 
denmendez65 said:
Pace doesn’t have individual balancing I believe? So chances are there is a hard limit on the DOD. Maybe 95%? If you go to 100 you run the risk of your cells not being balanced.

Then you have to rely on the over voltage charging thing people talk about here.
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Pacebms can balance per cell but only does at charging. It has a cutoff voltage per cell by default at 3.65 volt it will cut the charge mosfets so over charge won't happen
 
DTBA said:
One thing to note is all the cheap batteries just chuck the pace bms in with default settings at 58.something charge voltage.

That is on the high side.

adjusted my pacebms to battery full at 55.5 and charge at 56.0
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Bluetooth?
 
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