[RE-wrenches] Is it OK to add EG4LL-S alongside Fortress e-Vault Classic?

[Dave Angelini Offgrid Solar]

Run them seperate. Client has to be willing and smart enough to make 
this work or you will be really exposed. I would not do this myself but 
I could if I had to.
He and you will need to be good at Insight to get the BMS data from 2 
very different banks of very different age.
Good Luck !

Dave Angelini Offgrid Solar
"we go where powerlines don't"
    [2]https://offgridsolar1.com/ [3]  [2]
e-mail  offgridsolar at sti.net
text 209 813 0060

On 2025-10-14 3:18 pm, Mick Abraham via RE-wrenches wrote:

> Hi, Wrenchies~ I sold one E-Vault Classic cabinet to an off-gridder in 
> 2021 (18.5 kWh rated). He set it up open loop even though he's got 
> Schneider XW Pro. Now he'd like more storage and asked for a quote on 
> one EG4LL-S cabinet, fully loaded (30.7 kWh).
> 
> Surely he would have to stay open loop if these two brands are 
> combined. Both brands have 16 cells in series = 51.2 nominal volts. 
> However, EG4 documentation calls for 56.2 volts Bulk & Fortress calls 
> for 54.4 volts Bulk.
> 
> War stories or suggestions welcomed; thanks in advance. The Wrench List 
> is the Bomb!
> 
> Mick Abraham, Proprietor
> www.abrahamsolar.com [1]
> 
> Cell phone or for text messaging: 970-946-6584
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Links:
------
[1] http://www.abrahamsolar.com
[2] http://members.sti.net/offgridsolar/
[3] https://offgridsolar1.com/
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