Self-consumption project with Finistère batteries

[Gaston]

I think that lead batteries used at less than 50% discharge will definitely do more than 800 cycles.

Nevertheless it will probably not change the result of the comparison.

On the other hand, it should be remembered that lithium batteries require a much more precise and reliable (and more expensive) monitoring electronics than lead batteries (which, at worst in case of bad treatment, will be damaged, but will not catch fire. ..)

For recycling, the lead sector is developed and accessible (thanks to the starter batteries of cars) while for lithium, it is being set up.

[ENERC]

Hello,

CO2 balance sheet, lead or lithium batteries is almost identical.
Lead-acid batteries are recycled very well: lead sulphate becomes lead, sulfuric acid is converted into plaster with lime, and plastic ... like our bottles

To have cheap lead, it is necessary to leave on the OPZs (not OPZV). For example an 2V 266 Ah 140 battery 24V by 48 on alma solar (XNUMX volts)
Lifetime 20 years
3000 cycles to 50%
it gives: 140 € / (2V * 266 Ah * 50% * 3000 cycles / 1000) -> 17 cents per kWh

From the search result on "Comparison of price per useful kWh over battery life at a glance!" (no ads), it's more like 12 cents on large capacity OPZs.

For pylontech, this gives: 1350 / (2,4 kWh * 90% * 5000 cycles) -> 12,5 cents per kWh

The advantage of Lithium is that it is less fragile, it is not necessary to put water in the batteries every 6 months and that it discharges more current.

Price side, it will drop sharply: we are on the 5000 € for 30kWh in the car (Nissan / Hyundai). With this price of 160 € per kWh, the pylontech would be at 380 €. The price will fall below 100 € from kWh to 2020 in the car, then on batteries for the home.
In a few short years, storage will become significantly cheaper than buying one's kWh. At today's prices you will be a little above EDF 17 cents, but not much. (In the calculation we do not store 100% of what we produce If, ​​for example, you consume 50% of production, the actual cost of storage will be 6 cents per kWh - 12ct divided by 2).