Well finally found some time to connect the pv and the mppts.
Looks like a spider on lsd did the cable management
Look at those cables....
100mm2 wires.
Charging the internal capacitor up, i must admit, this was not really comfortable.
Couple of weeks ago i put some cables in the ground, from inverter to inside, 6mm2.
So for the house we are good to go.
Only thing with that switch, when it switches the inverter off in the event that the cells are "empty" it switches to the grid.....
After the cells are "balanced" again (after a big power demand) the switch goes back to the inverter, and i am not happy with that.
So i am going to instal a ac v meter to give us a estimend how far the cells are, we walk 3 times a day dogs and we work, so a quick look, and then we must manually shut the system off.
is very easy, when the batts are full we have around 245v ac when near low 235v ac dont hang me up on this one, still a bit of guessing work.
So when a "voltage table" is made it easy. or else the switch will go (and we) boncous.
When started cooking we draw a overall incl heating: 6kwh....total v loss from the back of the longest wires to the beginning of the inverter....0.07VOLTS....now that is low.
But not there yet:
Need to instal 3 bmses more for 3x 50A draw.
Now i have "just" 3x 50A and two times 25A
All the cells in the packs have a max deviation of 0.003v with that draw.
All the bmses are dividing the power, deliver or taking power.
Between the packs is in use a deviation of 0.10 volt, that is i think also very low, in not use after a couple of hours of sleep 0.01V
So my cable calculation was very good.
Some things to do in order of the timeline and importance to do:
- ground rod and ground wire, for pv, mppt, inverters, and ac side in the sheds!
- add some cover on the busbars
- adequate ventilation for temperature stability on cells(will give a update about when must do and more important why!!)
- double up the busbars for the near future (to 600mm2 total per bar! 60kwh max bidirectional)
- get 2 extra inverters from xyz or buy 3 5kw victrons.(this is still a debate in my head, mainly(/pure) future wise)
- first extend the two lower packs at the right side or first add 2 more complete packs for more power draw, need total of 400A draw.
- extend the overal battery to a whopping total of ----- drum roffels--->480 KILO WATT
- extend pv array(need to work on the house before this can happen)
Before you all say that is a *o dear* rich man....NO... i am a simple man, what we save, i invest, my journey last for over 5 years now.
Actually, i am not that simple: site manager, work planner, calculator, half a engineer and own boss of a insulation company.
Sinds i started this journey the savings were getting bigger as my pv and my powerwall extended.
Year one before ukrain war: 1500 euro, up to last year almost 4000 euro saved and converted to electric cooking and heating, now that was the "big saving", still calculating with prices before the ukrain war btw.
The "harvest season" was from beginning of april to end september, now our harvest started and use, started beginning februari....just saying.
Lets see what this year will bring, with those extra pv and cells added last year.
To be frankly speaking i am one year in front with our investment. (dont tell my better half)
