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Finally bought a Batrium BMS
#21
(09-19-2019, 09:23 AM)Sean Wrote: You appear to have the charger Vmax set to 56v, and your pack voltage (measured by the Batrium shunt) is also 56v - so given some small allowance for error it's no surprise that you'll see little if any charge current - the charger thinks the battery is full.

How much PV is attached to the charger, and do you see an increase in charge current if you increase the bulk charge voltage (temporarily) by 1 volt ?
 Hi Sean,

for having all cells at 4.0 Volt at the top, I calculated 56V is right here.

I have two 5KW Inverters, connected Solar Power is max 7.5V atm, because the pannels are spread into three directions.
It should be enough to get all cell packs fully loaded.

Ok, you say, no charging, because the value in the inverter and in WM is the same?
Update: I incresed bulk and float to 56.5 and now it's charging, but the already full cells also, which I want to avoid, how am I gone do this?



Thanks

cadric
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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#22
You have to proceed with some caution with regard to charge current when cells are in bypass, as it's fairly easy to put the mons into thermal bypass - so investigate using Batriums ability to change the charge current to a much lower amount (when in bypass)
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#23
(09-19-2019, 09:41 AM)Sean Wrote: You have to proceed with some caution with regard to charge current when cells are in bypass, as it's fairly easy to put the mons into thermal bypass - so investigate using Batriums ability to change the charge current to a much lower amount (when in bypass)

This are my actual settings regarding Charge current and Temp cut off on the Longmons:



I think, this is what you ment?
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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#24
No, CA1 to 3 within the charging settings relate to charge limiting when in bypass.

Just to clarify, you can't limit the mons temperature - all that setting you've illustrated does is to alter the point at which thermal bypass will occur - the actual temperature is a function of the amount of voltage, current and cooling you can apply - higher bypass currents will allow you to balance quicker, but you'll have to manage the mons temp externally.
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#25
(09-19-2019, 10:03 AM)Sean Wrote: No, CA1 to 3 within the charging settings relate to charge limiting when in bypass.

Just to clarify, you can't limit the mons temperature - all that setting you've illustrated does is to alter the point at which thermal bypass will occur - the actual temperature is a function of the amount of voltage, current and cooling you can apply - higher bypass currents will allow you to balance quicker, but you'll have to manage the mons temp externally.
But with these settings in the Cellmon Area, i can make sure that they don't get to hot, or am I wrong?
So it's a safety featrue in my view, right? So it will take longe until discharging is done that way.

Ok external cooling was already in my mind, like an channel, I already have for my two inverters, they get fresh air throught a channel outside the shed they are installed.
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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#26
The only way to prevent the mons from sitting at elevated temperatures for lengthy periods of times (when bypassing) is to reduce the bypass current to approx 650mA (ambient dependent) and/or actively cool.
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#27
(09-19-2019, 10:26 AM)Sean Wrote: The only way to prevent the mons from sitting at elevated temperatures for lengthy periods of times (when bypassing) is to reduce the bypass current to approx 650mA (ambient dependent) and/or actively cool.
The only way you can do the former is to have an mppt/hybrid/whatever charger that will talk canbus to the batrium WM.
This means: Victron or Schneider only iirc. Sean can advise if there are others supported, I'm away from my system and have lost telemetry so I can't check the supported devices for you.

What inverter/chargers are you using?

I use a 15yr old outback system which is completely unable to do any communication with the WM4 and have the same problem as you. It takes a lot of tweaking to get the voltages and absorption times set correctly to maximise charge but at the same time avoid cooking your mons.

I think all mons should have a fan on them and they should have a 5v power header for a fan along with a suitable boost converter to power the fan - I need to make some brackets for my 16x blockmons and get some small cooling fans on them.
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#28
(09-19-2019, 10:46 AM)HughF Wrote:
(09-19-2019, 10:26 AM)Sean Wrote: The only way to prevent the mons from sitting at elevated temperatures for lengthy periods of times (when bypassing) is to reduce the bypass current to approx 650mA (ambient dependent) and/or actively cool.
The only way you can do the former is to have an mppt/hybrid/whatever charger that will talk canbus to the batrium WM.
This means: Victron or Schneider only iirc. Sean can advise if there are others supported, I'm away from my system and have lost telemetry so I can't check the supported devices for you.

What inverter/chargers are you using?

I use a 15yr old outback system which is completely unable to do any communication with the WM4 and have the same problem as you. It takes a lot of tweaking to get the voltages and absorption times set correctly to maximise charge but at the same time avoid cooking your mons.

I think all mons should have a fan on them and they should have a 5v power header for a fan along with a suitable boost converter to power the fan - I need to make some brackets for my 16x blockmons and get some small cooling fans on them.

Hi HughF,

I have two Mpp Pip-5048MS , connected in parallel.
My pannels are connected in 3s and 2s and then paralleled.
The master Pip hat the 3s connected, the salve the 2s.
The slave is mainly in standby, I want to add additional equipment to have them cascaded.
So atm the Master is charging the batteries and producing output power for everything in my garden, the slave is only charging the batteries.

Maybe I really nee to think about a Victron BMV, cause that is supported by Solpiplog, which I'm testing atm.
This software can switch between the Power sources for charging and output depending on either time or SOC, if a BMV is added.

regards

cadric
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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#29
You need an mppt controller that is supported by the batrium canbus system so that you can command a reduced charge current when you are balancing.

Or, you could ac couple your panels and use Eltek flatpacks to charge your batteries. Unsure what you could use to glue the control logic together, I have zero experience of AC coupling, because I'm totally off grid.
Current system: 9.6kWh wet Nicad batteries, 16S1P Calb LiFePo4 210aH, Batrium WM4, Outback vfx3048 inverter, mx60 mppt controller, flexware 500 mounting hardware, 2.4kW solar array, 6kW lister diesel genset. MY'13 Vauxhall Ampera
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#30
(09-19-2019, 11:36 AM)HughF Wrote: You need an mppt controller that is supported by the batrium canbus system so that you can command a reduced charge current when you are balancing.

Or, you could ac couple your panels and use Eltek flatpacks to charge your batteries. Unsure what you could use to glue the control logic together, I have zero experience of AC coupling, because I'm totally off grid.

Ok, that means it needs further development and equipment to get what I want.
Canbus is the trigger here.....as I see it.

thanks again.


cadric
1. Installed Grid-Tie System 2017 16,5kWp:  55 x 300Wp BenQ, SMA Tripower 15000-TL30 (18-east/17-south/20-south)
2. Building Offgrid System 7,5 kWp: 25 x 300Wp Solarworld (5x( 3S + 2S )), 2x PIP-5048, Batrium WM4, in process : 18650th Powerwall,  Rest TBD
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