I had the same experience as Jay as far as being marketed three idea that
managed lithium batteries can jane several year age differences and still
play well together, only to be told, after telling my clients the same,
that most manufacturers don't recommend more than a year age differential
If the batteries have a 10-year life, I don't think it would make much
difference. LA batteries show an increase in internal resistance after a
few recharges. Typically, the BMS in a Li battery will ensure at top
balance all cells balance, If the batteries are being properly recharged.
On Tue,
Cc: jay
Subject: [RE-wrenches] speaking of batteries
HI All
Speaking of batteries I wonder what you all make of this.
I was reading the Fortress battery manual and it says they don’t recommend
adding new lithium batteries to older lithium batteries if the age is over 1
year difference
Even with LFP, mixing different-age batteries is still not the best idea.
Even if using closed-loop communication, they can get out of balance pretty
quickly, which will lead to all kinds of BMS issues.
One of the reasons I suggest using a main positive and negative bus with
breakers: You can
In a battery backup mostly float state with low cycle count, I’d add to a bank
several years later.
It’s really hard to say “several” since most LiFePO4 batteries haven’t been
alive for that long.
I’ve personally added 8 Pytes E-Box to 8 eFlex with no issue. The Schneider
Insight even
It depends on how the BMS shares with the new BMS. A state of life
measurement, the charge algorithm, and ? has to account for this for
them to charge and discharge well together.
Pretty safe to say one year for many makes of battery. Kind of like
bussbar use in large systems, is a way to
HI All
Speaking of batteries I wonder what you all make of this.
I was reading the Fortress battery manual and it says they don’t recommend
adding new lithium batteries to older lithium batteries if the age is over 1
year difference.
Thoughts?
thanks
jay
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