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

And that's delivered to your door in ROI? Not bad. I guess we are talking about €2400-€2450 all in then for 15.6kWh

I don't think Andy communicates any of his server racks, to my knowledge it looks like he just sets each BMS with the same settings and uses a victron charge controller with the desired charge voltage,bulk etc, and leaves well enough alone.

I'm having a different issue though and not sure if anyone with the same issue can shine a light, my Solis hybrid shows 2 different voltages, one is the battery voltage and the other, the BMS voltage, I'm not sure if the Solis will stop charging when it reaches the battery voltage in the Solis or the BMS voltage, the battery voltage in the Solis is always higher than the BMS voltage,checking the battery voltage manually coincides with the BMS voltage the solis reports.

I have another issue, I recently installed a victron lynx power in, I had originally connected each battery in parallel but later found out that each battery should really be fused, these batteries have no circuit breaker but do have over current protection, I have noticed after the install of the lynx power in that even though there now connected to a busbar the ramp up when adding a load is significantly slower, meaning the grid will be used more.

I suppose it's a drawback for safety.

Another question, if upgrading to the new 6kw Solis s6, can you use the existing metre that is connected to the CU with the ethernet cable?

The only real way I'm thinking is to add a victron shunt with Bluetooth or the bmv 712 to monitor the battery in real time as the 5 minute upload time is not great, has anyone integrated the victron shunt with home assistant as to be able to view the live view of the battery while away from home?

The new s6 Solis uses Bluetooth so this feature is the range is good enough might be an option, but I don't think it's in Ireland as of yet

I will try this setting in the parameters, I have set the BMS in all the batteries to start balancing at 3.45 volts, but my batteries are not top balanced so when it hits 3.65 volts on 1 cell the whole parallel pack stops charging.

The balancing capabilities of these generic BMS passive balancers are a disgrace.

I will add an active balancer for each battery in the future, and disconnect it when there balanced.

Thanks for the reply johndoe11 👍

Can you give me some advice on how you connected the active balancer to the cells, and which brand of active balancer did you go for, I'm nearly sure you have the same batteries as myself, I think as I haven't opened the case of any of the batteries, that there welded studs and not bolts, how did you connect the cable from the active balancer to the cells? Do you have any pictures you can share.

Thanks again johndoe11

Thank you for your pics, it will give me a good idea now how to balance the cells. I appreciate your help

Agreed, wouldn't leave overnight. it was probably on for 3 - 4 hours on each. They were quite a tight fit under the busbar so was happy enough that they were secure.

What makes these Envision cells so cheaper than EVE or CATL ones? Any red flags?

If anyone is tempted into upgrading their CALB's for these EVE's, then I'd be interested in the CALB's (if in or around Dublin)

I ordered two Mason kits from Fogstar via Postalpickup.co.uk and everything arrived smoothly, I wont be putting the kit together for a few weeks yet so can't comment on whats inside.

Fogstar were OK to deal with, quite disorganised and took a day or two to respond to each query but everything go there in the end.

Just in this what size lugs do you need to connect from the inverter to the battery?

Thinking of this company and not sure if I should get m10 or m8 lugs and 50mm cable.

https://offgridkit.ie/product/battery-to-inverter-or-charge-controller-cable-70mm2-bare-end-m10-m10-lug-1m/

Hi,

An update on my pack and a question :-) My 16 cells from NKON have been functioning perfectly at 300ah capacity but I had noticed recently that one cell was dropping much lower than the others as SOC reached 15% and was also at the top when SOC reached 100%. Cell 9 is the offending cell. It's not an issue now, but the cell has degraded from 6 months ago. It's the lower cell on the bottom graph.

I emailed NKON, they said OK, if I ship back the bad cell they will replace and pay shipping. Didnt want my pack down so I paid for replacement cell (135€) and they will refund the €135 + my shipping costs as soon as they receive the old cell. Response has been prompt, polite etc. Reason for the requirement to send back before replacement was they got stung previously with people asking for replacements and not sending back original cells

Now, my question - how do I ship the cell to holland ? Has anyone sent cells by post / courier ?

Thanks,

Ruairi

Most couriers should be ok, but don't even bother trying an Post. They are allergic to shipping anything with a battery abroad.