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Batrium: Remote charge targets & Eltek 2000HE
#1
As per some recent threads I'm wanting to control charge rate using an external charger over can.

This setup is nicely documented here, so I'm assuming its proven as functional by Batrium, but it's only partially functional in my test setup.

https://www.batrium.com/pages/how-to-con...h-watchmon

I've a number of the Elteks, they are all brand new, and I've no issues telling them what to do over canbus via a dongle and savvycan - so I'm sure the issues aren't external to the WM4.

Remote target setting appears to only work down to 13 amps (actual charger output) - open circuit voltage setting appears to work, within the remotes limits. But current control (using the charge target) doesn't allow below 13 amps, but limited settings do drop below 13 amps.

Chàrge target limited settings do affect a reduction in current, but don't relate to the charge targets.

So, a few more questions for anyone who has knows ......

Where are the charge target comms fields getting their data from ? (I have the Eltek on the battery side of the shunt, so if the field data is coming from the shunt then that's expected).

Scaling: I've read the single line of documentation relating to this, and it makes sense - but not when current scaling is required to be set to 10 for the actual measured current to be set correctly. (the how to states 100)

Tomorrow I'll find figure out what what the WM is actually telling the Eltek, I know what it should be telling it.

A general question, is anyone using the WM4 canbus reliably ?
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#2
I have 3 Eltek chargers running in my system, have them hooked up on the inverter side of the shunt... ( think this is the logical side.)
But i am using a WM1, so not sure about the WM2 but assume it is the same.

i found the WM1 is sending out only a broadcoasting command with the current and voltage settings to the Elteks, and takes feedback of only one charger to display on the batrium telemetry remote fields... d'ont think there is more done with those values....

It is working just fine... only not very much elegant.

I have done some checking of the comms between the WM(1) and the Elteks, but did not yet finished the work (as usual  Wink )

I would like to have a arduino mega inbetween the WM and the chargers to have them reporting back to the WM and have them coming online one by one, becourse it they get the command from the WM they switch on all at once and my generator gets overloaded...

So i am very interested what you are doing...

___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#3
I have WM4 and 2000HE

Shunt side is the logical side, I'll move it today, I did assume the telemetry from the Eltek would be used to populate the live fields, but seeing it blank made me doubt my reasoning.

Voltage and current are the only thing the WM needs to be broadcasting, but there's a raft of data available coming from the Eltek, including temps and actual voltages - I've seen a difference between the WM4 targets and the measured actuals, a few tenths make a lot of different here, I'd like to get the actuals documented.

So time permitting I will be looking at documenting the traffic between the WM and Eltek, there's a fair amount of data available already detailing the Eltek canbus, especially by Remmie on endlesshpere.

I'll ignore the fact we shouldn't be needing to do this.
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#4
Another day, another question - why no ticking Rx counter

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#5
The Rx counter is working here ... there is data coming back from the Eltek and populate the remote telemetrie fields (act volt, act amp, temp ) (again WM1) On the life dashboard there is a "charger target amps" and " actual charger amps " field available which are populated with the eltek data...

No Rx ticks and blank fields would make me think there is no data coming from your eltek (or a WM4 hikup)
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#6
I'd spotted that the other day, but wasn't overly bothered as the Eltek was receiving, but it's on today's list of things to ponder about.
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#7
Do some testing with the terminating resistors ... i found they mess up communication.
I now have only one on the WM side, ,none on the Eltek side. (they might have one already build in... not sure)
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#8
(10-02-2018, 03:29 PM)wim Wrote: Do some testing with the terminating resistors ... i found they mess up communication.
I now have only one on the WM side, ,none on the Eltek side. (they might have one already build in... not sure)

I did do the basics, briefly, when I started doubting my sanity. I've scoped the traffic and it's clean, and its being captured with no apparent issues, so I know it's there - just pondering why the WM4 isnt seeing it, but appears to be using it.

I've got another WM4 unboxed, a fresh start ......
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#9
Well .... if that wont do the trick, there is still the big old hammer to fix it ... Tongue
___________________________________
18x 300Wp solar off grid and 10x 180Wp solar tracker grid-tie
10KW 3phase hybrid inverter. 40Kwh 18650 storage (for now)
My setup: https://secondlifestorage.com/t-Instant-powerwall
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#10
Another day, a new WM4, new Eltek and breakout connector, fresh laptop, fresh DL of .31 from Batrium - I've even checked basic continuity and bus resistance.

Same lack of Rx, no reliable control of remote device - but oddly some unknown ticks.

I might see if there's any official support forthcoming tomorrow, for now I'm not going to waste any additional time on this BMS, as I've got a pair of the RECs in the queue.

If anyone else has a WM4 working with a remote canbus device, let me know.

http://www.rec-bms.com

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