I bought the 100A Daly BMS with separate port, and the description on the actual BMS says 20A charge current, 100A discharge current.
I spoke to Daly Official Store on aliexpress, and apparently they checked with the engineer and it can charge up to 100A.
Not sure if there is a language barrier where he doesn't understand my question...
I would say use BMS for loads, and not for chargers. If you have mismatched cells, and some hit a higher voltage at high SOC quicker than others, drop the upper limit voltage of your controller. 14.0-14.2v is a safe charging voltage that can give full capacity with LiFePO4 12v.
What was the amp rating of the separate port BMS that only provided 10 amps of charging.View attachment 665
Also, I posted this elsewhere sometime ago:
Quick update for advanced LiFePO4 raw cell systems using a Daly BMS:
On my website I recommended using a separate port BMS for over voltage protection for the mppt connection (if common port BMS is used, possibility of destroying mppt during low voltage disconnect).
Well yesterday, a viewer and I finally received our separate port BMS from Daly, and the amp rating was not as advertised on the listing. The separate port can only handle 10 amps!
Considering the likelihood of over voltage situation from most high quality mppt, and the chance of matched LiFePO4 cells going out of balance is rare (and BMS will correct for cell drift over time), and that LiFePO4 can be over charged to 4.2v per cell before electrolyte degradation... I would say its safe to connect mppt directly to the battery bank, and bypass the BMS entirely. We have been doing it this way for years, but people still want to use a BMS.
I would say use BMS for loads, and not for chargers. If you have mismatched cells, and some hit a higher voltage at high SOC quicker than others, drop the upper limit voltage of your controller. 14.0-14.2v is a safe charging voltage that can give full capacity with LiFePO4 12v.
I hope this helps! I bet most people building these systems will figure this out when they see this problem, but if you are a beginner trying to build an advanced level system, then this bit of information will be very useful. Let me know if you have any questions
View attachment 665
Also, I posted this elsewhere sometime ago:
Quick update for advanced LiFePO4 raw cell systems using a Daly BMS:
On my website I recommended using a separate port BMS for over voltage protection for the mppt connection (if common port BMS is used, possibility of destroying mppt during low voltage disconnect).
Well yesterday, a viewer and I finally received our separate port BMS from Daly, and the amp rating was not as advertised on the listing. The separate port can only handle 10 amps!
What was the amp rating of the separate port BMS that only provided 10 amps of charging.
and the chance of matched LiFePO4 cells going out of balance is rare (and BMS will correct for cell drift over time), and that LiFePO4 can be over charged to 4.2v per cell before electrolyte degradation... I would say its safe to connect mppt directly to the battery bank, and bypass the BMS entirely. We have been doing it this way for years, but people still want to use a BMS.
I would say use BMS for loads, and not for chargers. If you have mismatched cells, and some hit a higher voltage at high SOC quicker than others, drop the upper limit voltage of your controller. 14.0-14.2v is a safe charging voltage that can give full capacity with LiFePO4 12v.
I hope this helps! I bet most people building these systems will figure this out when they see this problem, but if you are a beginner trying to build an advanced level system, then this bit of information will be very useful. Let me know if you have any questions
Word!View attachment 665
Also, I posted this elsewhere sometime ago:
Quick update for advanced LiFePO4 raw cell systems using a Daly BMS:
On my website I recommended using a separate port BMS for over voltage protection for the mppt connection (if common port BMS is used, possibility of destroying mppt during low voltage disconnect).
Well yesterday, a viewer and I finally received our separate port BMS from Daly, and the amp rating was not as advertised on the listing. The separate port can only handle 10 amps!
Considering the likelihood of over voltage situation from most high quality mppt, and the chance of matched LiFePO4 cells going out of balance is rare (and BMS will correct for cell drift over time), and that LiFePO4 can be over charged to 4.2v per cell before electrolyte degradation... I would say its safe to connect mppt directly to the battery bank, and bypass the BMS entirely. We have been doing it this way for years, but people still want to use a BMS.
I would say use BMS for loads, and not for chargers. If you have mismatched cells, and some hit a higher voltage at high SOC quicker than others, drop the upper limit voltage of your controller. 14.0-14.2v is a safe charging voltage that can give full capacity with LiFePO4 12v.
I hope this helps! I bet most people building these systems will figure this out when they see this problem, but if you are a beginner trying to build an advanced level system, then this bit of information will be very useful. Let me know if you have any questions
View attachment 665
Also, I posted this elsewhere sometime ago:
Quick update for advanced LiFePO4 raw cell systems using a Daly BMS:
On my website I recommended using a separate port BMS for over voltage protection for the mppt connection (if common port BMS is used, possibility of destroying mppt during low voltage disconnect).
Well yesterday, a viewer and I finally received our separate port BMS from Daly, and the amp rating was not as advertised on the listing. The separate port can only handle 10 amps!
Considering the likelihood of over voltage situation from most high quality mppt, and the chance of matched LiFePO4 cells going out of balance is rare (and BMS will correct for cell drift over time), and that LiFePO4 can be over charged to 4.2v per cell before electrolyte degradation... I would say its safe to connect mppt directly to the battery bank, and bypass the BMS entirely. We have been doing it this way for years, but people still want to use a BMS.
I would say use BMS for loads, and not for chargers. If you have mismatched cells, and some hit a higher voltage at high SOC quicker than others, drop the upper limit voltage of your controller. 14.0-14.2v is a safe charging voltage that can give full capacity with LiFePO4 12v.
I hope this helps! I bet most people building these systems will figure this out when they see this problem, but if you are a beginner trying to build an advanced level system, then this bit of information will be very useful. Let me know if you have any questions
i noticed that any question they go to the engineer, smiles who is that engineer?I bought the 100A Daly BMS with separate port, and the description on the actual BMS says 20A charge current, 100A discharge current.
I spoke to Daly Official Store on aliexpress, and apparently they checked with the engineer and it can charge up to 100A.
Not sure if there is a language barrier where he doesn't understand my question...
DittoI bought the 100A Daly BMS with separate port, and the description on the actual BMS says 20A charge current, 100A discharge current.
I spoke to Daly Official Store on aliexpress, and apparently they checked with the engineer and it can charge up to 100A.
Not sure if there is a language barrier where he doesn't understand my question...
Daly always says I will check with the engineer, and comes back after a while, and say its good total bs, there sure is a language barrier,Ditto
Will took apart a BattleBorn and although the BMS isn't a Daly, there doesn't appear to be a separate charging charging port on that BMS.Curious, What kind of BMS did Battle Born or Relion or others engineer into their batteries? Could this offer direction cuz they support both high charge and discharge rates.
I am worrying over 4p 8s BMS set up my self. That is to say 4 BYD 24v batteries in parallel. After I bought all this stuff I seen a video Will made, and he said I might be asking for trouble if I go over two or three 8S in parallel. I also will be using 4 separate port BMSs. If you find out any good data please share. Thank you in advance.When you say loads do you also include accessories such as power to my Morningstar GFDI, Battery Capacity Shunt, etc? I had originally planed to run my battery negative lead to a grounded bus bar with the BMS in between them. From the (-) Bus I would have connected the Charger, Shunt, GFDI, and the Main Load. Now I understand I shouldn't use the BMS to disconnect the MPPT Charger. So should I connect the charger directly to the battery bank and then have the BMS between the Battery and (-) Bus (Disconnecting the load and all accessories)? Or should I connect the BMS between only the (-) Bus and my Main Load?
Thanks your input!