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help about choose a BMS with CAN
#1
Hello every one, i m going to buy a SOLAX X1 inverter X hybrid for my 4,5KW panels solars.

I want to store the energy in my diy packs that i made ( 14s battery )

Do you know if my simple chinese BMS can be sufficient for this kind of inverter to charge,
i m afraid that without CAN communication, the inverter doesn't want to charge the battery.

I am right ? maybe i can cheat the inverter by setting a 'lead battery' and set all the voltage ( cut-discharge, charge , float , etc... ) mannualy not a good idea ? 

if yes, can you give some models of BMS with CAN communication functionnality, who can allow my inverter to charge ? 

I want to charge my packs and with this inverter, i will ( if it works ) cancel totaly my energy bill.


Sorry about my english, it is not my usual language Smile
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#2
Lead has different modes of charging that Lithium won't like, Lithium chargers are based on a CV/CC (constant voltage/constant current) charge algorithm. The charger limits the amount of current to a pre-set level until the battery reaches a pre-set voltage level. The current then reduces as the battery becomes fully charged. This system allows fast charging without the risk of over-charging and is suitable for Li-ion and other battery types.

When charging lead-acid the charger will hold the maximum voltage for the chosen battery and charge the battery with reduced current as the batteries internal resistance can’t accept the charge current at maximum output. Once the current reduces to approx ≤10 % of the chargers total output, it will then move to the float state. The absorption stage is also time based, if the charger is still in its absorption phase after 4 hours, the charger will automatically transition to the float stage. This generally happens if the charger is undersized for the battery bank or there are loads running on the system and not allowing the charger to reduce the current below the transition point.

Most if not all lead acid chargers have an equalization mode. On some chargers, this mode may be automatic which can’t be turned off. Lithium batteries do not require any form of equalization. Applying an equalization charge of 15v+ to a lithium battery will damage the cells beyond repair.

Why not just get a BMS that has a configurable CAN setting? for example:

https://www.orionbms.com/features/fully-...le-canbus/
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#3
(09-15-2019, 04:51 PM)LPG Wrote: Lead has different modes of charging that Lithium won't like, Lithium chargers are based on a CV/CC (constant voltage/constant current) charge algorithm. The charger limits the amount of current to a pre-set level until the battery reaches a pre-set voltage level.  The current then reduces as the battery becomes fully charged.  This system allows fast charging without the risk of over-charging and is suitable for Li-ion and other battery types.

When charging lead-acid the charger will hold the maximum voltage for the chosen battery and charge the battery with reduced current as the batteries internal resistance can’t accept the charge current at maximum output. Once the current reduces to approx ≤10 % of the chargers total output, it will then move to the float state.  The absorption stage is also time based, if the charger is still in its absorption phase after 4 hours, the charger will automatically transition to the float stage. This generally happens if the charger is undersized for the battery bank or there are loads running on the system and not allowing the charger to reduce the current below the transition point.

Most if not all lead acid chargers have an equalization mode. On some chargers, this mode may be automatic which can’t be turned off. Lithium batteries do not require any form of equalization. Applying an equalization charge of 15v+ to a lithium battery will damage the cells beyond repair.

Why not just get a BMS that has a configurable CAN setting? for example:

https://www.orionbms.com/features/fully-...le-canbus/
Well, that's a total load of hogwash...

A standard bulk/absorption/float cycle as programmed into every mppt controller that supports battery charging will be perfectly fine for a Li chemistry battery bank, provided that you program the setpoints correctly.
Set your charge current (the CC phase), set your absorption setpoint and timer (the CV phase), set your float voltage (so that your batteries rest and the sun carries your loads until sundown)... Easy...
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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