Electronics > Power/Renewable Energy/EV's

DIY 48V LiFePO4 battery pack for home ESS [Energy storage system] in 2022

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Zucca:
I just started to design my off grid home system.
Since my power company does not support net metering and for other reasons, I think it will be best for me to put in place a off grid energy storage system, PV Panels and use the grid only if necessary (battery low or home asking for too much power).

I would like to use two Victron Energy Quattro 10KVA 120VAC wired up in a split phase configuration.
Yes, I am located in USA.

Now I need some battery, and I am temped (looking at the costs) to build my own 16S packs starting with 3.2V LiFePO4 cells.

Specs:

- >100AH, 200AH preferred
- M8 screw terminal connectors

Since most of the batteries are made in China, I would have no problem to buy on the www in Aliexpress or so, but I am worried not only about lemons (should not be the case), but to get bitten by the slow supply chain.

On top of that I need a good BMS system.

1 - Can you point me to a good battery shop? China or USA?
2- What would be a good BMS system for that?

I have a TTi QPX1200SP and a TTi LD400P to perform some experiments to understand if the cells are good or not. Plus some 6.5 bench DMM.

Many thanks in advance for all your help.

Zucca:
For example

https://www.aliexpress.com/item/3256804013889748.html

 :popcorn:

NiHaoMike:
Have you considered an EV battery pack? The 400V or so matches up to 240V mains (340V peak) quite well and saves a lot of cost in voltage conversion.

Then there's energy storage technologies other than batteries. Thermal storage HVAC is a good one if there's significant HVAC demand. Pound per pound, making ice gives about the same cooling as running a conventional air conditioner from lithium batteries, but making ice is several orders of magnitude cheaper.

Zucca:

--- Quote from: NiHaoMike on June 16, 2022, 02:54:30 am ---Have you considered an EV battery pack? The 400V or so matches up to 240V mains (340V peak) quite well and saves a lot of cost in voltage conversion.

--- End quote ---

What inverter you wanna use then?


--- Quote from: NiHaoMike on June 16, 2022, 02:54:30 am ---Then there's energy storage technologies other than batteries.

--- End quote ---

Yes I would like after the battery are full to dump the enery in the electric water heater which is a air to water heat pump with a resistance heater if needed.
I never thought you can dump the energy in ice. Here were I live (SC, USA) it is a warm climate so not sure if it is a smart idea...

Zucca:
How about this one?

https://www.victronenergy.com/battery-monitors/lynx-smart-bms

https://www.victronenergy.com/media/pg/Lynx_Smart_BMS/en/index-en.html

I can't understand it it monitors the single voltage cells of the 16S pack I wanna build.

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