I'm moving to a new property in Hull and so will be out of action for Insight project work for a few months as it needs a fair bit of work.
I'll still help on the forum, with postal orders for items, and urgent IMA work in the UK.
However I do have a project in mind for this new property.....
It has a 4kw leased solar array on the roof.
It exports excess energy to the national grid.
The solar panel company get paid per kwh actually generated (not exported).
The house owner gets to use the full amount of the generated energy for free.
So I'll have to make sure i'm using or storing
the full output of the array on a daily basis. Presently excess power just goes to the grid and I get no benefit.
You can't get that power back again from the grid without paying...
You can see where this is going
I'm going to store every watt of excess power the solar generates over my domestic load.
I'm going to build a massive (expandable) power bank using the 200 or so old sticks I currently have in stock. I'll use a solar inverter to put the stored energy back into the house to avoid importing power from the grid.
I won't be able to tap the panels directly (most efficient) or that would reduce the kwh on the leased solar generation meter and the company would notice. I'll have to extract the power from the mains once it has been inverted by their own solar inverter.
So it will be Leased Solar panels > Leased Solar Inverter > My House AC. > My battery bank charger > My Battery bank > My solar inverter > My House AC..
Looking at the solar power records it looks like it is generating about 13kwh a day in August.
Since it was installed in August 2014 it has generated 12845 kwh.
At a cost of say £0.16p per unit that equates to £2055 worth..
Over the three years since install it appears to be doing around 10+kwh a day average.
I'll try and get the kwh import consumption records for the property for the same period.
Anyway as far as the battery bank is concerned.
It will be made of stacked long lengths of 1'1/4" plastic tube.
Into these will be slotted 10 or 20 sticks in series joined by a short length of 6mm stud.
So imagine a long sausage of sticks 25ft in length.
Each tube will hold about 600wh or something.
Each sausage will have 2 x 400V 10A diode in the + feed charge input and power output circuits to stop the sausages discharging into each other. Don't want any runaway nimh..
Adding further sausages (20 sticks) as I get packs in from customers should be a doddle and not require pack reconfiguration. just add the sausage to the stack and connect it to the power bus.
See pic you get the idea..