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HBPowerwall (Official)
#21
(02-24-2017, 07:41 AM)ozz93666 Wrote: That's some very nice work ... very orderly and professional , and some serious storage capacity  ...

The question must be , with so much capacity , what do you charge up to ?  ... it seems to get the max life from the cells 3.9 or 3.8 is the highest we would want to go  ???  Discharging no lower than 3V?

Charge to 4.0 when it's good weather, 4.1 if i know we have a few cloudy days, 3.57 is bottom voltage or 57.4 & 50v
PaulDane likes this post
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#22
Thanks for the live youtube this am, or was it your pm. Good to see you chat about alternatives to the parts you are using. I wish someone would come up with an easier way of interconnecting the batteries.
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#23
There are many ways of doing it, using those four cell holders from Amazon many are 3D printing solutions. My way is not the only way to approach this type of DIY project - do your own research and see if you can make it better!
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#24
Batrium Package I'm currently using - https://www.batrium.com/products/starter...4s-longmon


I will be ordering more LongMons & maybe a Bridge Connect to attach them to my packs in the next week or so, so far I'm totally impressed with what this BMS offers. The more I ask the more it seems to do. But for now totally happy with it's monitoring and reporting abilities and how about fans to keep shed cooler!
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#25
Long awaited updated project cost.

This is as good as it gets for how much I've spent, don't burn me on the little details take it for what it is. 

If you have questions please ask  Big Grin

Updated Price List
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#26
The killer is the battery cost though... if you can't get them around $1/cell its quickly gets painfull
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#27
(03-28-2017, 12:49 PM)baradhili Wrote: The killer is the battery cost though... if you can't get them around $1/cell its quickly gets painfull

You should be able to get them substantially cheaper than that. At $1/cell, that's $6/pack, insanely expensive.
Fully-Tested 2001-2200mAh Cells, $1.35 each!
^ Use coupon code "powerwalls" on checkout for a 10% discount!
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#28
(03-28-2017, 01:03 PM)mike Wrote: You should be able to get them substantially cheaper than that. At $1/cell, that's $6/pack, insanely expensive.

new to this, but where can you get them under $1/cell?
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#29
(03-28-2017, 02:05 PM)baradhili Wrote:
(03-28-2017, 01:03 PM)mike Wrote: You should be able to get them substantially cheaper than that. At $1/cell, that's $6/pack, insanely expensive.

new to this, but where can you get them under $1/cell?

Are you talking about used laptop packs or buying brand new cells?
Fully-Tested 2001-2200mAh Cells, $1.35 each!
^ Use coupon code "powerwalls" on checkout for a 10% discount!
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#30
(03-28-2017, 02:08 PM)mike Wrote:
(03-28-2017, 02:05 PM)baradhili Wrote:
(03-28-2017, 01:03 PM)mike Wrote: You should be able to get them substantially cheaper than that. At $1/cell, that's $6/pack, insanely expensive.

new to this, but where can you get them under $1/cell?

Are you talking about used laptop packs or buying brand new cells?

I guess its a matter of balance, used with life is probably the best TCO, but cannot see where to buy them...
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