diy solar

diy solar

Growatt 24v 8s 100 ah fortune batteries settings

This is how I built my 24V compression fixture https://diysolarforum.com/posts/245041/

I'm working now on designing two 12V packs for my fishing boat deep cycle batteries. I'll most likely build something similar but add a hinged cover, maybe some sides with perforation. I measured it up today and have plenty of room for 280Ah cells.
 
atWar said:
So the aHr capacity of the battery is not part of the equation and the voltage max of the Growatt determines the size of the PV array but what determines the size of the bms? Is it the max charging current of the Growatt? I will contact Overkill but would like to understand how this works.
Click to expand...
 
williamseric1111 said:
I would love to know what you find out. I think the max AC charging of a Growatt 24v is 80A. The max solar charging current is 100A. https://www.growatt.com/upload/file/contents/2019/07/5d2eee093f00b.pdf
Click to expand...
This is the reply I got from overkill:
The 8s 100a BMS will allow you to discharge at 100a continuously, about 2400 watts.
With 1 battery your inverter will be limited to this power level.
If you added a second complete battery you will be able to fully load the inverter
Click to expand...
The specs in my request were for a 310ah 8s battery and Growatt 3000. So this bms will work but will not meet capacity discharge of the Growatt so I'm thinking a 120ah bms would get closer to "fully loading" the Growatt ie. 2880 watts. That make sense?
 
atWar said:
This is the reply I got from overkill:

The specs in my request were for a 310ah 8s battery and Growatt 3000. So this bms will work but will not meet capacity discharge of the Growatt so I'm thinking a 120ah bms would get closer to "fully loading" the Growatt ie. 2880 watts. That make sense?
Click to expand...
Overkill BMS doesn't have a 120a BMS in 8S.

You get 2 choices really, add another 8S battery which gives you 200a total or 4800 watts or have a 12V system with two 12V 4S BMS which just gets you to 2880 watts.

I'd prefer the second 8S battery myself. This allows full capacity of a 3000w inverter with plenty of headspace.
 
Zwy said:
Overkill BMS doesn't have a 120a BMS in 8S.

You get 2 choices really, add another 8S battery which gives you 200a total or 4800 watts or have a 12V system with two 12V 4S BMS which just gets you to 2880 watts.

I'd prefer the second 8S battery myself. This allows full capacity of a 3000w inverter with plenty of headspace.
Click to expand...
Yes, I was looking at the 4s module. Of course I could find a different brand at 120a but prefer the overkill. Just want to make sure what I buy will work.
 
Thanks Zwy!! That’s how i configured mine. Two sets of 100a BMSs, but mine is two 24v setups then paralleled. 8s 200ah. Or 400ah at 24v.

Now if I can just figure out what I want to do for solar panels, and how my local county officials will respond if and when they find them on my house. I just really only want a couple of panels. My setup is more for emergency and fun, but might as well take advantage of the inverter and batteries.
 
atWar said:
Yes, I was looking at the 4s module. Of course I could find a different brand at 120a but prefer the overkill. Just want to make sure what I buy will work.
Click to expand...
The problem with running max amps thru any electrical device is the possibility of shortened lifespan. Not saying the Overkill couldn't handle it with no problems but we all know that maxing out anything electrical is more prone to failure.

Of course if the 2880w inverter is way oversized for the load on it, then you're fine.
 
You must log in or register to reply here.

Similar threads

B
Growatt 3500TL LVM-US and SOK 48v 100ah questions
Replies
8
Views
447
Bhilton
B
J
Need help with settings for MPP Solar LV2424
Replies
3
Views
536
Jameswy
J
J
6000XP battery settings
Replies
1
Views
270
EG4TechSolutionsTeam
EG4TechSolutionsTeam
V
4x12.8V 200Ah LiFePO4 with their own 100A BMS + Growatt SPF6000ES inverter + PV panels
Replies
7
Views
212
AshleyL
A
J
Growatt 3000 LVM 24v x 2 split phase not getting 240v
Replies
3
Views
334
jonnyc21
J

diy solar

diy solar
Back
Top