Since 1,5 years I'm collecting our electricity consumption with an ABB B23 meter > modbus > ESP8266 > mqtt > node-red > MySQL & Graphite > Grafana.
So I'm very well aware of our habits
Total yearly usage is 4300kWh @ 1200.
The average base load of the house is about 200w, with the new 4500kWp solar installation now working long days we have only have to import 3,5kWh on sunny a day.
An average winter day without any solar 12kWh. (induction cooking)
After enjoying this forum a full winter I've started harvesting cells this spring, a had a stash of about 450 cells from laptop battery packs.
About 240 have a reasonable +85% capacity left in them, but I do not yet have found a steady source of battery packs in Belgium, so I ran out of cells...
To give the project a jump start I was thinking about buying 1400 brand new Panasonic NCR18650BD cells at a wholeseller.
This gives the 14s100p system ~12kWh within the 3.2v 4.1 range, not enough to go off-grid but I estimate to be 250 days grid-independent with this setup, 821 budget a year to play with
I might consider to leave the induction cook-thing (7kW) initiallyon-grid for sake of modular evolution and start with only 1 Victron MultiplusII 5kVA (limits also the pack to 1C discharge)
I do have spare time in winters and my young sons are really helpfull in the recycling proecess, so I hope to find other sources to add another recycled 14s100p string.
That way I do not consider buying tested cells from Degroot Recycling.
Any thoughts on this approach?
I do have doubts about the combination of a brand new string with eventually (multiple) recycled string(s).
Batrium will keep things all within specs but the brand new pack will always be in the front line delivering energy I assume.
So I'm very well aware of our habits
Total yearly usage is 4300kWh @ 1200.The average base load of the house is about 200w, with the new 4500kWp solar installation now working long days we have only have to import 3,5kWh on sunny a day.
An average winter day without any solar 12kWh. (induction cooking)
After enjoying this forum a full winter I've started harvesting cells this spring, a had a stash of about 450 cells from laptop battery packs.
About 240 have a reasonable +85% capacity left in them, but I do not yet have found a steady source of battery packs in Belgium, so I ran out of cells...
To give the project a jump start I was thinking about buying 1400 brand new Panasonic NCR18650BD cells at a wholeseller.
This gives the 14s100p system ~12kWh within the 3.2v 4.1 range, not enough to go off-grid but I estimate to be 250 days grid-independent with this setup, 821 budget a year to play with
I might consider to leave the induction cook-thing (7kW) initiallyon-grid for sake of modular evolution and start with only 1 Victron MultiplusII 5kVA (limits also the pack to 1C discharge)
I do have spare time in winters and my young sons are really helpfull in the recycling proecess, so I hope to find other sources to add another recycled 14s100p string.
That way I do not consider buying tested cells from Degroot Recycling.
Any thoughts on this approach?
I do have doubts about the combination of a brand new string with eventually (multiple) recycled string(s).
Batrium will keep things all within specs but the brand new pack will always be in the front line delivering energy I assume.
