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Finally bought a Batrium BMS
#31
(09-19-2019, 11:47 AM)cadric Wrote:
(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
Or, just put fans on your mons and use the batrium 'cooling required' output to switch the fans on. Don't run too long an absorption time, I use 20 mins which is enough for me (Sean will advise a longer absorption time if you have a reduced current when balancing, which if you can do in the future, do that)... and make sure you set your float voltage at a suitable voltage which I can't advise for your chemistry as I use LiFePo4
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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#32
(09-19-2019, 12:39 PM)HughF Wrote: Or, just put fans on your mons and use the batrium 'cooling required' output to switch the fans on. Don't run too long an absorption time, I use 20 mins which is enough for me (Sean will advise a longer absorption time if you have a reduced current when balancing, which if you can do in the future, do that)... and make sure you set your float voltage at a suitable voltage which I can't advise for your chemistry as I use LiFePo4
Yes, good recommendation, fans is the first thing to do, now.

Absorption time? what is it exacly, and where do I set this feature?
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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#33
(09-19-2019, 01:01 PM)cadric Wrote:
(09-19-2019, 12:39 PM)HughF Wrote: Or, just put fans on your mons and use the batrium 'cooling required' output to switch the fans on. Don't run too long an absorption time, I use 20 mins which is enough for me (Sean will advise a longer absorption time if you have a reduced current when balancing, which if you can do in the future, do that)... and make sure you set your float voltage at a suitable voltage which I can't advise for your chemistry as I use LiFePo4
Yes, good recommendation, fans is the first thing to do, now.

Absorption time? what is it exacly, and where do I set this feature?
Absorption time is the amount of minutes that the charge controller spends in the CV phase, at your charge setpoint (56v for you iirc) whilst the current drops down and the last 5-10% of capacity is pushed into the batteries.

If you are happy to charge to a lower %SOC then just set a lower absorption setpoint and a short timer, it will then drop to float and the sun will carry your house loads whilst maintaining the battery at the %SOC until sundown...
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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#34
(09-19-2019, 02:36 PM)HughF Wrote: Absorption time is the amount of minutes that the charge controller spends in the CV phase, at your charge setpoint (56v for you iirc) whilst the current drops down and the last 5-10% of capacity is pushed into the batteries.

If you are happy to charge to a lower %SOC then just set a lower absorption setpoint and a short timer, it will then drop to float and the sun will carry your house loads whilst maintaining the battery at the %SOC until sundown...
Ok, now I see, it's a parameter to be set in my Inverter, but not under absorptin time, on Watchpower it's called Max. Charging Time and set to 0.

It seems I need to set all the parameters in the Invereter right, at first.

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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#35
Be careful how you wire the fans up if you are going to use some kind of transformer to 12V for fans. Trust me I learned the hard way. As a result Batriums web site has more up to date information on just how to do this...follow it closely.
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