Solar System for 4s 16.8v NMC Lithium Ion Batteries

Hi all,
I am designing a custom solar system setup and want to be sure it will work.
Here's details on all components
Solar Panels - Two 12v panels at 115 W each (already owned)
Charge Controller - Victron BlueSolar MPPT 100/30
Batteries with BMS - Nissan Leaf Generation 2 Battery Module Lithium Ion NMC
2 units at 500 Wh each = 1000Wh x 70% usable = 700Wh usable. These batteries are 60-70% usable capacity (I guess because BMS limits it?)
Inverter - Victron Phoenix 12V 500W
Wall Charger - 54.6V 9A YALANCHA
My goal is to disconnect the solar panels and connect the wall charger (powered by generator) on cloudy days. The reason I chose a 48v charger is because I will eventually get a 48v battery for an electric bike so I'd need it anyway. I calculate that I can plug this charger into the inverter to charge the bike battery from the Nissan Leaf batteries. What do you think my potential issues are? Thanks a ton!
Comments
Battery management. EV batteries are prone to "Venting Flame" much more so than the safer LFP batteries.
https://batteryuniversity.com/learn/article/types_of_lithium_ion
and often need thermal control (coolant) in cars. If you willl not be placing any demanding load on them that would cause them to heat, you might be OK
What is your containment structure for them ?
A small bike battery charger will take days to recharge the large battery bank
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
mike95490
I was originally thinking a wood box but now that you mention fire maybe a metal box? The max input from controller would be 30A (more like 10A with only 2 panels hooked up) and the max draw would be 500W. Would that still generate a dangerous amount of heat/fumes? I can go with LifePo4 if needed but would be fun to create a system with the much cheaper Nissan Leaf modules. Also I calculate that this 48v 9a bike charger would charge the 1000Wh battery in 2.3hr is that correct?
@Raj174
Could you explain why this charger won't work? I'm not sure what you mean by "MPPT function", I would need the controller to accept 48v, (54v to be exact, 48v is just the nominal rating), buck it to 16v (increasing amps from 9 to 30), and give it to the battery. And if the battery is discharged to say 13v it would convert the excess to heat as I am assuming controllers do. Thoughts?
Most MPPT chargers regulate themselves by shifting the Max Power Point around - which works great with PV panels as they are a current source. But a battery or power supply is a voltage source and unable to be managed the way a solar charge controller expects to manage the charging. You are planning to operate outside the design specs for the chargers, so expect excitement.
|| Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
|| VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A
solar: http://tinyurl.com/LMR-Solar
gen: http://tinyurl.com/LMR-Lister ,
https://forum.solar-electric.com/discussion/351215/dc-dc-battery-charging-using-a-charge-controller