Off grid system with SimpBMS & Tesla Modules

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walter_widmore

New member
Joined
Sep 6, 2021
Messages
3
Hi all,

I'm starting to build an off-grid system and wanted to share my plans / scheme before buying components. Any feedback or tips are more than welcome!


Thanks,

Solar setup details: 20x Hyundai HIE-S395VG (5x in series -> 4x in parallel)
 

OffGridInTheCity

Active member
Joined
Dec 15, 2018
Messages
1,706
Looks pretty complete / very nice drawing. The thing that jumps out at me is the 24v. At 5000w/24v = 208a and 20 * 395w = 7900w PV and... comment to expand to 10 batteries - you might consider 48v from the git-go. In my opinion, you're already in the range where 48v would be good + if you plan to expand...

Looks like you're planning Tesla modules - which are 6s74p (per my understanding). '48v' would be 12s74p and in the range of 3.3v * 12 = 39.6v low and 4.1v * 12 = 49.2v hi. This 40v - 49v is a bit lower than traditional 48v equipment... but perhaps something could be found or consider a different battery bank type.
 
Last edited:

Patalhetas

New member
Joined
Oct 24, 2019
Messages
21
Looks like you're planning Tesla modules - which are 6s74p (per my understanding). '48v' would be 12s74p and in the range of 3.3v * 12 = 39.6v low and 4.1v * 12 = 49.2v hi. This 40v - 49v is a bit lower than traditional 48v equipment... but perhaps something could be found or consider a different battery bank type.
I have a system like this, and works very well between 40v and 49V (SOC 20% ~ 80%)
.... scheme before buying components. Any feedback or tips are more than welcome!

Why 24V ? why U don´t start with 48V ? ( for me the best advantage, is the cable thickness, more thinner, less heat in the components cables, busbar etc ... think about
 
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