Emerson/Vertiv R48 Rectifier

mjatkey

Guys, nothing wrong with a bit of research even if it is Ai and Chinese, in fact last few days I've been using Mr Chat to script me some bits in HA and I must admit he's done a great job.

To be honest I've learned so much from both here (Boards) and DIY solar forums both reading and asking questions, as well as Mr Youtube, our own ghost has a whole heap of videos centered around the Solis inverter and the Seplos batteries, he's even added a second string inverter and additional panels and again documented it all which is great.

I've not tried the Lead Acid set up on the inverter yet or separate balancers which I know some people use on the Seplos with good results.

Balance wise on the new V4 cell spread has not been a problem mainly because I'm not "stretching the cells up or down".

The WECO's are solid with the cells never more than a couple of mV apart (which is what you would expect from a factory built battery and BMS).

Once I get the standalone rectifier set up and working, I'll see what way to run things BMS wise, will probably have a mess around with a Victron shunt at some point (good write up on DIY).

Ghost has his Emerson connected to his setup and reports that it works well, has it connected to smart switch for control and monitoring.

Final word.

The knowledge and experience of many of the guys on here is fantastic and there is never such a thing as a stupid question..

graememk

https://www.boards.ie/discussion/comment/123543588#Comment_123543588

"best way to find the right answer on the internet is to say a wrong one!"

Its the wholesale copy paste of poor information from the LLM that bugs me. It can sound right, but its nonsense. If I was a teacher marking it, id have red lines through most of it.

What id recommend for you to do right now, is not empty the battery as much through discharging to grid but fully charge the battery. Ideally be able to log the voltages of the cells when its nearly fully charged.

LFP batteries will not show any imbalance until you get them above 3.4v (or below 3v)

SoC drift is a fact of life with LFP and the only point in time you can define a reliable SOC from a voltage is when the battery is full. I'm running a Zeva BMS and 2 JK's. The Zeva isnt being sold anymore, and now the code is open sourced. So ive been tweaking it! SoC is just a count of the Ah in and Ah Out, expressed as a %.

This is my SoC graph from a few days ago, Possibly didnt get a full charge in 2 weeks,
A calb pack and 2 envision packs.

Explaining the graphs, the SS Battery SOC is my "known good" been running it now for nearly 4 years, It used to drift "up" but now ive built into it a 2% reduction in its Ah counting when charging.

When the JK's were at 0% the average cell voltage is still at 3.2v. Need to tweak the settings of jk2 to allow it to reset to 100% little quicker.

This is where variance in the Ah settings of the batteries come into play. the JKs are likely set a little low or my zeva is set a little high. But for what im doing, the JKs can do what they want, I dont need them to be "in sync"

TrueBlue1000

@championc @graememk

Thank you very much. I guess I was over thinking it. I know what to do now. Just need to order a rectifier and wait for the Seplos to arrive.

TrueBlue1000

https://www.boards.ie/discussion/comment/123542799#Comment_123542799

@graememk

To avoid confusion for future readers I deleted the information above.

Thanks again.😊