Newbie trying first 16s 304ah diy lifepo4 battery. What would be your best overall 200a BMS recommendation?

[Aridom82]

I am going to build my first battery.
It will be 16s 304ah lifepo4 but i dont know where to start with the BMS. I need something that can push 200amps
What would be your best recommendation? Thanks

 

[Ampster]

I would base my decision on which inverter I was using and whether I wanted communication between inverter and BMS.

 

[Rocketman]

If you need the battery to push more amps than the bms can supply, you can always add a contactor. This is a large relay. What happens is the bms controls the contactor and the large load goes through the contactor.

For my system I used a contactor based bms. The contactor I used is a Tyco EV200AAANA (that’s the 12-36v one - they have a 48v one).

Good Luck

 

[Aridom82]

I would base my decision on which inverter I was using and whether I wanted communication between inverter and BMS.

well i really dont need communication between inverter and bms. I see some brands, Daly, JBD, JK, i am kind of lost here. Could you point out a model that you would recommend?

 

[Aridom82]

If you need the battery to push more amps than the bms can supply, you can always add a contactor. This is a large relay. What happens is the bms controls the contactor and the large load goes through the contactor.

For my system I used a contactor based bms. The contactor I used is a Tyco EV200AAANA (that’s the 12-36v one - they have a 48v one).

Good Luck

Thanks, i will take it into consideration

 

[brum]

What is the inverter? No communication between these two has both pros and cons. An example is SOC drift on the inverter side and having 50% charge in the battery, but the inverter shutting down due to low SOC.

But if you don't need communication - JBD has a 200A inverter with an active balancer.

 

[Aridom82]

What is the inverter? No communication between these two has both pros and cons. An example is SOC drift on the inverter side and having 50% charge in the battery, but the inverter shutting down due to low SOC.

But if you don't need communication - JBD has a 200A inverter with an active balancer.

this is my system, i have 3 voltronic max axpert 8kw each, and also i have 3 orient power server rack batteries (jakiper battery clone)
i am going to add diy lifepo4 batteries in the 16s configuration. Maybe i can use a bms similar to the ones the jakiper, sok, etc batteries have, with the little screen and interface i dont know yet.

 

[Quattrohead]

If you can find the exact BMS that your existing batteries use and use that in your DIY pack that would be the best overall. But after that either a JBD with contactor or JK are good units.

 

[Zwy]

You really don't need a 200A BMS if you are paralleling with the batteries already in place. 4 batteries in parallel would split the load. The battery bank I built has 4 batteries in parallel. Charging at 120A is 30A per battery, discharging at 160A is 40A per battery.

 

[Aridom82]

I am looking to the JK and they look good, however my batteries (and a lot of other brands) use a bms that looks like this. This is the seplos smart bms. Are these any good?

 

[Aridom82]

You really don't need a 200A BMS if you are paralleling with the batteries already in place. 4 batteries in parallel would split the load. The battery bank I built has 4 batteries in parallel. Charging at 120A is 30A per battery, discharging at 160A is 40A per battery.

yes the more i look into it the more it looks like something like 100A would be enough. What do you think about the seplos smart bms?

 

[Zwy]

yes the more i look into it the more it looks like something like 100A would be enough. What do you think about the seplos smart bms?

I run a Batrium on my house bank. I have several JBD/Overkill and those work well.

Andy from Off Grid Garage did some testing on Seplos, wasn't a good experience. But some members here used Seplos and had good luck. Start with this long thread about Seplos. https://diysolarforum.com/threads/seplos-can-bus-rs485-48v-200a-8s-16s-bms.20051/

 

[Ampster]

JBD has a 200A inverter with an active balancer.

I think it is the JK which has the active balancer.

Could you point out a model that you would recommend?

I currently use JBD BMSs one of which has a contactor and I would recommend that brand based on personal experience.
I use a JK 2 Amp active balancer on my larger pack and have had good experience. I have also read good reviews on their BMS with active balancer.

 

[brum]

I am looking to the JK and they look good, however my batteries (and a lot of other brands) use a bms that looks like this. This is the seplos smart bms. Are these any good?

This is the Seplos BMS. A dedicated thread in the forum exist about them - https://diysolarforum.com/threads/seplos-can-bus-rs485-48v-200a-8s-16s-bms.20051/ .

Are they good - I would say yes. The do have some flaws. Like low balancing current and not as good as I would like configuration options. Also lack of proper documentation.

But since you already have 3 of them it make sense to continue using them. This would enable you to enable communication between the batteries and the inverters.

 

[HRTKD]

I've had a very good experience with my JBD BMS. It's a 4s 12 volt but they make a good 16s 48 volt also. If you were in the U.S. I would recommend looking OverkillSolar.com for a JBD. You can still buy JBD from other non-US sources.