Who is happy with their BMS?

[svHope]

Hello, I am experimenting with a small 4S DIY battery system. I currently have a REC BMS that has a number of features that I like, the one I’m not too pleased with is how the REC SOC compares with my Victron BMV 712 SOC. Some of this may be because I am experimenting with a small 20 aH battery.

On the boat I plan on building 4 ea 200 aH batteries for a total capacity of 800 aH. I want to check to check and see who is happy with their BMS and comment on what kind. My loads can be high (300-400a) but short duration on the boat, so I think a remote relay connect/disconnect is my only choice. Things I like with the REC are, programming and flexibility of trigger points, interface to my pc for programming and logging, blue tooth connection, it balances cells very well, reliability reputation.

 

[Johnson]

Using the SBMS0, I wanted something that does not produce heat and I am using the Victron Multiplus build in relays to control the charging/discharging. I am happy with it and the maker uses and supports the product he makes. I have no experience with any of the other BMS's...

 

[toms]

The problem with SOC is that the batteries aren’t 100% efficient

To make matters worse, this changes with temperature and charge rate.

The REC and BMV both have an algorithm to “reset” to 100% when voltage and current indicate a full battery.

If this doesn’t happen they get less accurate every charge cycle.

edit: I’m a happy REC user.

 

[svHope]

The problem with SOC is that the batteries aren’t 100% efficient

To make matters worse, this changes with temperature and charge rate.

The REC and BMV both have an algorithm to “reset” to 100% when voltage and current indicate a full battery.

If this doesn’t happen they get less accurate every charge cycle.

edit: I’m a happy REC user.

I agree there is a lot to like about the REC BMS, but I'm still in the learning mode. The other fact is that I am experimenting with a small capacity battery charging it fully and discharging it down to the low part on the knee. Thanks for your input.

 

[HRTKD]

If you were to use the Overkill Solar 120 amp BMS on each of the four batteries, that would be a total of 480 amps. It seems like that would satisfy your load expectation just fine. The hole in the feature set is integration with other devices. So far, I haven't felt a burning need for that.