[RE-wrenches] speaking of batteries

[Howie Michaelson]

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
(although apparently a few say mix and match till your heart's content).
They also recommend keeping them in open loop, I think mostly because of
all the firmware updating that is happening on both the battery and
inverter side which causes continual incompatibility issues.
Disappointing, to say the least.

Fortunately, I have yet to see any Fortress BMS failures.

Howie
Sun Catcher

On Tue, Apr 23, 2024, 10:37 PM Darryl Thayer via RE-wrenches <
re-wrenches at lists.re-wrenches.org> wrote:

> 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, Apr 23, 2024 at 4:05 PM jay via RE-wrenches <
> re-wrenches at lists.re-wrenches.org> wrote:
>
>> 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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