[RE-wrenches] BMS as OCOD

[Dave Angelini Offgrid Solar]

I agree as long as you have a long history with the battery/BMS.  Since 
all of this is so new or constantly changing I would add a class T as it 
has a minor chance of being a failure item.

When I was testing this for Schneider, even they added the T fuse for 
insurance as no-one had tested the internal T fuse and contactor. Cheap 
insurance.

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 2025-07-14 10:12 pm, William Miller via RE-wrenches wrote:

> Friends:
> 
> When I design a lead-acid battery system I decide if I need 
> over-current protection right at the battery or not.  My logic is:  if 
> the leads are short, don't go through a wall and are well protected,  I 
> can rely on OCPD in the BOS cabinets. If any of these criteria is a no 
> I put appropriately rated class T fuses right at the battery.
> 
> I'm thinking that since BMS devices have over-current protection 
> baked-in, fusing at the battery would not be necessary for BMS equipped 
> batteries in any case. Do you agree with that premise?
> 
> William Miller
> Miller Solar.com
> 805-438-5600
> www.millersolar.com [1]
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Links:
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