Home battery bank build - Overview of what's required and costs? (in Canada)

[sprdave]

We are considering building a battery bank for home - probably 30 kWh to 50 kWh range, 48 volt. In the looking I've done so far, building a diy battery bank from cells seems like the lowest cost.

This is for back up power, and for "load shift" purposes basically. We're looking at electricity pricing that has very high rates from 4pm to 9pm, in exchange for very low rates overnight.
(we could then charge EVs and the battery bank overnight).

Question is, what is all involved, what parts and equipment (including tools) are needed? What cost estimate am I looking at? (to determine if the idea is feasible) I do have electrical background, including solar, just not in building batteries.

Anyone know good sources for Canadians - either to buy in Canada or to have shipped from oversea?

The cells I've seen seem to come as large as about 300 Ah. So probably looking at either a 2p16s or 3p16s?

I think a 200 A output would suffice, probably would see a 10 kW inverter at most, more likely around 5 kW (not covering whole house).
Preferably something that gives some level of monitoring (like SOC). Might get Home Assistant, but not sure.

Parts that initially come to mind include 48 LiFePo4 cells, a BMS (or would it be BMS for each 16 cells?), wiring including main fuse or breaker?, whatever the cells would be stored in (preferably on wheels), etc.

I'm particularly asking about the battery bank part now, but will also be looking into inverter chargers.

 

[davros]

Assuming you have exhausted all the Canadian “retailers”>
If you can drive and ship across your cells maybe a USA source could work but realistically do your research and go with :trusted vendor” from China, not Ali or Temu. Use Alibaba and spec everything with DDP (to your door) prices.
Batteries should be engineered not just slapped together. Know the melting temperatures of all items in your build, interrupt capacity of the anticipated fuse, wire,.etc.
Stripping Temu packs for cells /and similar should be left to the experienced. We can learn both good and bad from teardown vids

 

[~Yuri~]

EVE released very high-capacity 560 Ah cells this year. But in my opinion, they are only suitable for permanent installation, assembled on-site, due to their heavy weight.

 

[davros]

EVE released very high-capacity 560 Ah cells this year. But in my opinion, they are only suitable for permanent installation, assembled on-site, due to their heavy weight.

Personally I favour 280-350 Ah as max and I would not parallel cells inside a pack, a 200-300 A BMS per 16S anecdotally have reasonable (to me) failure rates on my research. Do read the actual cell data sheets, some call out fairly low C rates.
Good engineers can and will disagree on design choices and “best practices”