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Which BMS - Leaf System
#1
I'm now at the point where I need to make a decision on the BMS for my leaf power wall.

I was going Batrium Leaf system - However it's like 1299 AUD which in my mind seems insane - and it can only be used with leaf modules due to the physical design, so limits its future use.

The other Batrium solution is the Watchmon 5 - coming in at around $799 AUD. This could be a more future proof system if I ever change to different batteries.

The other - REC is also something I'm not familiar with at all but seems to have a good reputation.

Anyone care to comment?
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#2
(12-10-2019, 02:42 AM)slimf Wrote: I'm now at the point where I need to make a decision on the BMS for my leaf power wall.

I was going Batrium Leaf system - However it's like 1299 AUD which in my mind seems insane - and it can only be used with leaf modules due to the physical design, so limits its future use.

The other Batrium solution is the Watchmon 5 - coming in at around $799 AUD. This could be a more future proof system if I ever change to different batteries.

The other - REC is also something I'm not familiar with at all but seems to have a good reputation.

Anyone care to comment?

Watchmon 5 is a 'light weight' supervisor.  Watchmon 4 (and I think a new one - 6 or 7 is coming) is the traditional, heavier duty, general purpose supervisor.   
The 'mons' are the external cell monitors that communicate with the central supervisor. Leaf mons are built to simply 'bolt on' to tnissan leaf modues...   but you don't have to use them.  You could use regular (general purpose) long mons and wire/mount them yourself and then re-use them on different lithium chemstry (18650,  LifePo4, etc) down the road. Leaf and Long mons function the same - they just mount/wire on differently.

I use Batrium, and it works well.   I'm approaching 70packs - 48v@1300ah - and I'm only using 25% of its capabilities.   I think of Batrium as flexible, really good for large battery banks, with full internet and centralized monitor/control.     

But having said all that, an alternate BMS might very well work for you.  I watched a youtube where a guy used 6 (seperate) bluetooth/phone-app BMSs to manage 1 overall battery. Instead of 1 central control there were 6 BMSs each operating independently and you selected them from a list in your phone app. Individually they were cheaper but balance capabilities (in terms of amperage) were limited compared to Batrium and there were no options for external controls (such as fans or custom shut-trips).

 I think it gets down to your ultimate goals, battery size, budget, approach to monitoring things (PC/centralized or Phone/multiple-BMS or 'other'), short-term vs long-term, $$, and other factors.
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#3
You could always use Batrium longmons or blockmons instead of the leaf ones - not quite as high bypass capabilities but you have the flexibility you're after?
Running off solar, DIY & electronics fan :-)
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#4
You can use longmons with the Leaf cells too, it doesn't have to be the Leafmons. That way if you ever change your mind, the longmons can be used with other style batteries as well.
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#5
Thanks - The reality is that I will probably stick to Leaf Modules now that I have them (and am looking for more).. Just need to save for the Batrium.
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#6
(12-11-2019, 04:59 AM)slimf Wrote: Thanks - The reality is that I will probably stick to Leaf Modules now that I have them (and am looking for more).. Just need to save for the Batrium.
There is the DIYBMS project and one of the members of the forum is designing a board compatible with the Nisan Leaf Cells.  

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