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 allows two comm cables and shows both SOCs. 

At another customer, I’m adding four Pytes batteries a quarter until we get 16. 
Grid Tie battery back up. Once we get to 16 will turn on time of use metering 
and exercise the batteries a bit more.

Thank you,

Maverick

Maverick Brown
Off-Grid Solar Commander since 2006
Maverick Solar Enterprises, Inc.
 • Solar Commander Remote Power
 • SunFlow Systems Cathodic Protection 
[email protected]
512-460-9825



> On Apr 23, 2024, at 4:05 PM, jay via RE-wrenches 
> <[email protected]> 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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