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

What size calb cells fit

The cases will fit EVE 200Ah/230Ah cells but not 280Ah/302Ah cells

Mine worked out at €145 each including delivery for 302ah the ones from your link are coming up as £113 so €132 each for 280ah and how much is shipping

If the Wall Box is Solar unaware, then the inverter will give power to whoever wants it.

Also, it will likely draw at a constant 7.0kW.

So with solar and non-Solar aware chargers, you're sometimes better to use the granny charger.

To block the Battery discharging, set a schedule to charge at Zero Watts / Amps for the duration of car charging

I just don't have time now to explore the world of home assistant which i have no doubt would solve many of many household issues, puzzles, and desires! Is there any one or a company that will design and set it all up?

Hi Hexoman,

Shipping:£30.00 via DHL Express Europe (All european customers will not be charged UK VAT - but will have to pay local VAT upon arrival)

Battery seems to be max charging at 2.15kw. Is that right or have I messed with a setting, I feel like I was getting higher at one point?

Solis 6kw, DIY as per OP battery, JK BMS

Sound so absolutely no issue winding the settings up and blasting more Kw into it

finally got a few minutes to do a write up;

- I had limited (read "no") knowledge about electricity and DIY projects but decided to try building a DIY battery.

- The total time spent on the project was around 12 hours of actual work, excluding research and learning time. It would be less than half this if I did it again tomorrow, but I was ultra slow and cautious.

- Here's a breakdown of the time spent on different tasks:

 - Unpacking, assembling the batteries, and setting up the BMS: 4 hours

 - Planning battery cable setup and connections: 1 hour

 - Ordering cables and accessories: 1 hour

 - Browsing online: 3-5 hours

 - Moving battery into storage box (optional): 0.5 hours

 - Connecting battery cabling: 1 hour

 - Setting up Solis (solar inverter) settings: 1 hour

 - Reading forums and watching YouTube videos: 5-10 hours

List of purchases made for the project:

 - Batteries: 200A CALB LiFePO4 cells from AliExpress (1620 euros, these are 1444 at time of writing)

 - Isolator switch: 16 euros

 - JK BMS Active Balancer: 157 euros

 - Various cables, fuses, crimping tools, and accessories (total cost: approximately 200 euros). mainly used AliExpress and some bits from Amazon. Some cables locally

points that stand out;

Delivery of batteries was split over two days and required careful handling.

The BMS was easy to set up and provided a confidence boost as you see life!

Additional cables were needed for the inverter, fuse, and BMS connections.

Crimping thicker cables was challenging, got one or two made up at local auto shop, a pricey way of doing it, handy to have a heavy duty crimper tool at home.

In hindsight, it would have been better to crimp the B- and P- cables together.

Despite some complexities, the DIY battery project was successful and now battery functions. I grid shift in winter.

I got a large plastic box at homestore and that holds the batteries snugly. Be careful to have your batteries in the desired order and location when bolting together- as it's all super heavy once stitched together, so hard to move very far on your own.

There is lots of support to do all of this!!

There is 2 or 3 great YouTube channels which offer an easy way to up-skill knowledge.

A few regulars on here are also very knowledgeable and open to help. Thanks Unkel, championc, and gramemk, and others.

Looking at the Facebook PV group I see one reputable installer who can do 10kw battery for around 4,000 euro. My DIY was half that, and it would be cheaper if you have the few tools already, and I should remember I have the tools for life now so technically can't contribute all my costs to the battery alone. Battery from an installer was closer to 5k last year when I was doing this.

My main challenge at moment is my BMS not talking to inverter. If battery runs out it triggers inverter alarm and manual wake ups or resets. I think the solution is to have an active balancer seperate to a BMS that can talk to my Solis. Right now the JK BMS is both a BMS and active balancer which is convenient, easy to install, and very tidy with wires etc., but the solis communication issue is annoying and forcing some unnecessary micromanagement.

For me I enjoyed doing a DIY project during a brief low period in usually very intense worklife. The numbers do matter too...tbh anyone paying full whack for a battery for an installer in Ireland is going to struggle to find ROI for their wallet or the planet, as the feed in tarrif is high in Ireland and so surplus solar power going to the grid isn't a bad thing if it's being paid at 20-22cent, and it is monitored by a smart meter so paid for actual not assumed surplus (as per dumb meter process)/.

Seplos BMS talks to Solis inverter just fine when using the correct seplos firmware

Can't see the JK BMS at fault there, but you could just temporarily bypass it by connecting the Solis directly to the battery terminals. If still only 2.2kW charging (while you are exporting), the Solis is at fault. Good luck with the warranty claim, it will likely take several months but you should get a replacement eventually.

So my diy battery not charging at more than 2.2kw. Solis got back to me within a few hours and did a firmware update remotely.

its been pouring rain since so no opportunity to see large excess and where it was going