Electronics > Power/Renewable Energy/EV's
DIY 48V LiFePO4 battery pack for home ESS [Energy storage system] in 2022
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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