10kWh LifePO4 DIY Battery Addition..... Here is my write up.

jasgrif11

Are you just purchasing standard M3 self tapping screws?

on_the_roots

https://www.boards.ie/discussion/comment/121997717#Comment_121997717

Under normal operation, for sure. But what if for some reason the cell's temp raises relatively quickly? Until the sensor on the busbar detects, it might be too late.

The terminal goes deep into the cell, so this is far more precise measuring the temp from there.

SD_DRACULA

https://www.boards.ie/discussion/comment/122000117#Comment_122000117

I can't see individual cell temp reading anywhere on the jkbms so not sure it's even doing that (unless not being displayed to the user) plus you're reading the busbar not the terminal.

I have seen this widely used online so I would say it's safe to do, I have even seen it on the prebuilt battery packs that have the welded busbars.

oaklands

I drilled a 2.5mm hole in the busbar using a metal drill bit, then used an M3 tap drill bit to create the M3 thread. Then all that is needed is a very short M3 screw.

For Temp: I put each of the 4 JKBMS sensors between the foam padding. So that covers 8 cells but isolates the other 8.

unkel

https://www.boards.ie/discussion/comment/122000595#Comment_122000595

That is exactly what we did too with the busbars. Part of the reason is that the batteries were going to be mounted near the ceiling of a shed and the (custom made solid copper) busbars were hard enough to get onto the cells without the added complication of the balance wires, so we had the latter attached first

Evd-Burner

Hi All, I need a little help. I purchased everything I needed to build a Seplos managed 16s2p (calb) cells battery with a ME3000SP inverter 13 months ago.

I bought prematurely as there was a body of work I needed to complete prior to install, that body of work kept getting delayed and was finally completed in September gone, I had planned to get the battery up and running by end of October and started the fully charging and top balancing process. My cells are now sitting idle for 6 months, I just did a voltage test, see attached image.

Should I recharge and balance them all?

My batteries are located at the back of my garden office in a shed section, I noticed today that there was some dew on the cells, I suspect this may have occurred due to excess moisture in the area after the door shutter was left slightly up and a decent amount of rain water got in, cells are not on the ground, thoughts?

The battery is now the focus to get up and running by the end of this month at the latest.

unkel

https://www.boards.ie/discussion/comment/122000860#Comment_122000860

You left the cells fully charged, which is not a great idea if leaving them for so long. But not to worry too much, these cells are very strong and will likely be fine. Those voltages might look wildly different to you, but in fact they are very close together as even your lowest cell at 3.348V is still 90% charged and anything at or above 3.400V is 100% fully charged.

If you have the time, you should put them all in parallel and charge them up until they are all at 3.650V. Then rebuild the battery into 16S and start using it. Or leave them as is, sell your Seplos, buy a JK BMS and it will do the balancing for you

Evd-Burner

https://www.boards.ie/discussion/comment/122000889#Comment_122000889

Cheers Unkel, yeah I really hadn't intended to leave them long at all, it was just a case of wiring up and connecting everything to get it going but a few things came up with family and work that soaked up all my time and before I knew it 6 months had passed.

I'll wire them up in parallel tonight and leave them for a week to balance out so. Will stick with the Seplos for the time being as other wise I fear I may end up further delaying, I have time now with work not busy but that changes come May.

Any thoughts on the Dew forming on the cells?

on_the_roots

Can someone confirm this is a good bi-directional DC Circuit Breaker to use between Inverter/Battery? I tried to find the datasheet of the model (HSM1PV-125) but didn't find anything online.

This is also quite cheap in Amazon UK (€25,00), so wanted to confirm first.

Evd-Burner

Hi all, need a little help.

Seplos BMS doesn't seem to detect the correct voltages, am I missing something that first needs to be configured before it can run?

Also does anybody know where that ambient temperature sensor is located?

Screenshot below is from when I disconnected but it's how it shows when I am connected. Pack is at 54vdc.

championc

Possibly an issue with one of the cell wires, or two swapped over.

Check the voltage from each cell to each pin on the cable

And there should be 4 temperature sensors on the ribbon cable too.

So maybe one of the two cables isn't properly seated ?

Evd-Burner

Thanks championc, your comment gave me a point to start investigating and I think I have found the problem. 1 of the voltages at back of Seplos terminal was showing 3.54 then the next 0.0v and the next was -0.352 which wasn't right, the rest just kept going further into the negative.

So for the busbar wiring I followed this setup.

But for the BMS signal cables I followed this.

It looks like the cell numbering between the 2 are flipped so therefore my voltage were all over the place.

I will have to take the pack apart and reorientate the cells.

Hopefully then it resolves the voltage reading issues.

Evd-Burner

This is going to sound like a stupid question but I need to double check to make sure I have this correct.

Cell 1 Negative should connect to the main Battery Negative on the BMS.

Cell 32 Positive should connect to the main Battery Positive on the BMS.

championc

Correct.

Cell 32 gets a red balance cable and the main red positive battery cable

Evd-Burner

Thanks for that, I've finishing taking apart the cells and re-cabling. BMS is now showing the voltages.

Does anybody have a list of what settings need to be changed for 2p16s 200ah calb cells?

Once I have the settings changed I was going to do a full discharge and then recharge so the BMS can work out the capacity.

The devils

Seplos v3 e10 pdf

Hope this helps

SEPLOS V3 E10_24(1).pdf

...Ghost...

https://www.boards.ie/discussion/comment/122501678#Comment_122501678

That's the version 3 BMS. The other poster has an older V2 setup, with no seplos kit. But definitely helpful for V3 with active balancing and a DIY kit. I'm currently building my second one.

The devils

https://www.boards.ie/discussion/comment/122533644#Comment_122533644

Yea I know that , it's meant for anyone going forward

SD_DRACULA

Bought some BMS boards like these ones for a (probably unnecessary) upgrade:

I don't have these fancy pre-drilled busbars though so I was wondering do I tap busbar in the middle like above or closer to the screw terminal like so:

Probably doesn't matter

graememk

https://www.boards.ie/discussion/comment/122611347#Comment_122611347

It doesn't matter. Any position on the busbar or either terminal on that bus bar would be within measurement error of the BMS.

SD_DRACULA

https://www.boards.ie/discussion/comment/122611418#Comment_122611418

Strange way of them wiring up the temp probes, attaching them to the busbars, don't think I will do it like that, the busbars will get hot when cycling the cells so temps will probably always be higher than actual

poker--addict

getting no grid alarm due to something tripping the fuse box. Not sure if there is a pattern or not, had it few times in recent weeks.

Any tips for trouble shooting? I'm thinking setting wrong across new BMS and inverter settings. It's annoying

graememk

https://www.boards.ie/discussion/comment/122986357#Comment_122986357

Very unlikely to be BMS or inverter settings.

"Something tripping" was it the inverter rcbo?

Is there a flag window in the rcbo?. Was it quite wet when it happened?

slayer91

Hi,

Looking at options of adding a solar LiFePO4 battery to my Solis 5Kw Hybrid inverter. I have been following a number of threads here and there is a lot of useful advice. I have seen an offer from Fogstar for the following for 1539 sterling.

https://www.fogstar.co.uk/collections/solar-battery-storage/products/seplos-mason-280l-and-x16-grade-a-eve-lf280k-battery-bundle

Does this seem like a good offer for 14Kw battery, I have no issue on the assembly and I worked in the electrical area.

What do ye think?

Regards

The devils

You can do cheaper imo ordering separately

But at least ordering everything from fogstar it all comes together (in one)

Good Luck

crutches0811

Any thoughts on gobel diy kit versus seplos?

https://www.gobelpower.com/poland-stock-gobel-power-diy-kit-512v-280ah-battery-case-kit-with-bms-circuit-breaker_p217.html

THE ALM

https://www.boards.ie/discussion/comment/123007062#Comment_123007062

A recent build/review -

New Gobel Power Battery DIY Kit V2 - Better quality, further improvements, cable size correct?

mjatkey

https://www.boards.ie/discussion/comment/123006534#Comment_123006534

Just completed one of the Fogstar/Seplos V4 builds, very straight forward and looks to me to be good quality kit, don't have it connected to the inverter yet but have the older V3 in an apartment (no panels) and that works perfectly.

Came in at £1500 with the 314Ah cells (Black Friday offer).

Lots of support both on the build and connection to inverter (especially the Solis) on here.

kevinr7213

The fogstar kit looks like a great job. Good reviews online aswell. Only problem is, they only deliver to the north which is a bit of a pain.

I'm looking up kits for a family member and came across Basengreen. Has anyone used Basengreen?? Mixed reviews online. LINK :

https://www.basengreen.com/product/diy-case-for-48v-300ah-battery-packenclosure-accessories/

€1826 deliverd from EU warehouse for kit and 16 x 314ah EVE cells.

mjatkey

https://www.boards.ie/discussion/comment/123017935#Comment_123017935

Plenty of companies in the north that will take delivery and forward on to republic, think someone on here got it delivered for €60, I paid £30 just to collect in the north.