Found a couple. Man the chinese inverter companies are coming out with a lot of new equipment.

First, from europe: Victron Quattro parallels.

And I'm going to try a Helios from Cnbou. Fingers crossed.

Just a quick update (I know. I always say that.)

The 12s cell monitor does appear to draw down off all cells. The first monitor I tested appears to have one cell measurement .02v lower than the others. The 4 other monitors (I brought in 5) all appear to be more accurate.

However, the cell voltage readings from the Bm12s are not super accurate. Close enough for the funny papers.

I am out of 2015 battery modules. So now to find more packs.

Well. Turns out only the one monitor seems to draw poorly from the cells. The 4 others are okay. So I've kept the one bad one and relegated it to intermittent monitor duty. And sent some of the others out into the world.

Now I may have found a BMS. Stay tuned.

Creeky

What are you going to use all this stored energy for now. What appliances are you operating with it. LED lighting??? better yet mini-split??

Randen

Hey randen, how'z the truck?

Being off grid I'm pretty energy thrifty. So I do have all LED. Along with a zigbee network that turns lights on and off with timers/sensors.

And I've been selling battery packs. Turns out lots of folks want small battery systems for cottages, but don't want to spend thousands of hours doing research. Driving for days to pick up and collect. All to spend dozens of hours testing and configuring. Who knew?

Fingers crossed. I'm building a 30kw pack this month. Should be fun. And with the bigger pack comes more monitoring with finer resolved "system integration?" So that extra bit of work/problem solving keeps me interested.

Oh. And mini split. GREE Crown 9kw soon to be ordered!

Aaaaaa. Just bought a 2016 pack. Gonna tie it to a Schneider Connext 80/600 at 60v.
10 panels. 450v?

What am I thinking? Smile.

Edit/add on:
And pack prices are up 40% this year. I gotta stop talking about this.

Great project and writeup.
Are you still happy with the Chargery BMS?
I'm looking at the BMS16.

I used the Chargery BM. Just the monitor. They aren't terribly accurate. I measure with a voltmeter when I want an accurate measurement. And then recorded the difference from the BM to the voltmeter. So far the error seems stable. Painful workaround but...

You may have seen this fellow on endless-sphere. He's making the Chargery BMS look pretty good. Especially as the new version comes with some nice add ons. Bluetooth et al.

TYVA BMS seems similar.

One Year Update:

Well, I'm jumping the gun on this a bit. But in celebration of SPA day (solar power appreciation) I tested my lithium cells to monitor cell drift/balance.

Here's the result

http://creektreat.ca/wp-content/uplo...yearreport.jpg

To wit, after one year we have these results:
* no cell drift. None. Zip. Zero.
* efficiency far surpassing expectations
* no maintenance other than monitoring
* = happy Creek

And I've found a nice niche product to sell. SESS with lithium. I call them PowerWings.

And a big shout out to all who have helped. You folks are the best. Thank you.