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Old 08-10-2022, 02:30 PM   #1
john fox
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Default why not 3-12's for 36 volt lithium?

I need to start thinking about changing out my 6yr. old battery pack in my 1998 txt.
thinking about going lithium.
I thought 3-12v batteries would be more versatile than 1-36v battery but read in another thread it's better to go 1-36v WHY?
would there be a problem with three bms as apposed to only one?
the reason I was thinking 3-12 would be better was if in the future if I had to replace my old cart with a newer one {48 v } my three 12v lithium batteries could move easily to a solar system where one 36v battery maybe not.
thoughts?
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Old 08-10-2022, 03:41 PM   #2
ojo
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Default Re: why not 3-12's for 36 volt lithium?

I'm no lithium expert but, i know 12v (lithium) in series is NOT recommended
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Old 08-10-2022, 04:51 PM   #3
Pat911
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Default Re: why not 3-12's for 36 volt lithium?

Lithium batteries are protected by a Battery Management System, or BMS. With 3 12v batteries youíll have 3 BMSís doing their own thing and not knowing about the other two. With a 36v battery, thereís only one BMS protecting the whole pack.

Iíve written about this extensively in the past but simply, when charging, if one battery becomes fully charged the BMS will disconnect, protecting it from overcharging, but when this happens, the other two batteries will also stop charging. Over time youíll end up with three batteries that are vastly out of balance and your 100Ah pack, for example, may be reduced to only a 50Ah or 70Ah pack.

Secondly, most general purpose 12v lithium batteries cannot produce the required current to power a cart, especially if itís modified in any way.

Specific to you John, adding a fourth battery at a later stage will only exasperate the imbalance problem described above as the fourth battery will be at least one of the following, different batch, different capacity, different age, different internally even though itís the same battery externally etc.

Go for a single 36v battery and youíll never look back, or go for 48v and do the upgrade now.

Cheers
Pat.
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Old 08-10-2022, 05:37 PM   #4
scottyb
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Default Re: why not 3-12's for 36 volt lithium?

Explained very well Pat. A similar problem happens when the conventional batteries are out of balance. The result is a shortened useful life for all of the batteries.
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Old 08-10-2022, 08:37 PM   #5
john fox
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Default Re: why not 3-12's for 36 volt lithium?

thanks guys, 36v it is!
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Old 08-10-2022, 11:17 PM   #6
Pat911
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Default Re: why not 3-12's for 36 volt lithium?

Quote:
Originally Posted by scottyb View Post
A similar problem happens when the conventional batteries are out of balance. The result is a shortened useful life for all of the batteries.
Correct, but the difference between conventional lead acid and lithium though is that with LA, when one battery becomes fully charged the charger keeps going and overcharged it whilst the other two or three batteries catch up. They are essentially top balanced at every full charge as they can tolerate limited overcharging without too many problems.

Lithium, on the other hand absolutely cannot be overcharged and when the BMS of the most charged battery decides it's time to intervene and stop charging, so do the other two or three, as they are connected in series, even if they are no where near full.

Cheers
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