ERD50
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
Hopefully, when we pull the trigger, the solar panel technology will have improved that much more.
If solar PV prices come down as they have been, I think it makes sense to wait. It seems that the prices are coming down at about the same rate as payback, so why not just wait?
Neighbors bought a leaf and got solar - they love that they're charging their car in a "clean" way.
While that sounds good, too bad that it is just not the case. It's repeated so often in the various EV forums I've been reading, it really needs to be straightened out. I covered this in an earlier post, in a 'truth table' format, I'll re-post that here, but I think I'll add a 'narrative format', that might make the point better -
For simplicity, let's assume a household consumes one 'unit' of electrical power average per month. And assume if they purchased an EV, that would consume one 'unit' of electrical power average per month. And that they could install PV solar that would produce one 'unit' of electrical power average per month. Now consider each possibility:
1) NO EV; NO PV; - status quo - consume ONE unit electrical, consume X gallons gas
2) NO EV; YES PV; - consume ZERO units electrical, consume X gallons gas
3) YES EV; NO PV; - consume TWO units electrical, consume ZERO gallons gas
4) YES EV; YES PV; - consume ONE unit electrical, consume ZERO gallons gas
As a narrative -
Take that first paragraph above, then assume they add solar first. You can see that they now consume no electricity on average, and their allocation of the pollution that the power plant generates is zero. So this is great enviro-wise.
Now they add their EV. Adding the EV means they now draw one more electrical unit from the grid (and the allocated pollution) than they were w/o the EV. The EV undid the good they did by adding PV!
Or you can turn it around, and they add the EV first. At that point they are consuming two units of electricity on average, and their allocation of the pollution that the power plant generates is twice what it was before.
Now they add solar. Adding the solar means they now draw one less electrical unit from the grid (and the allocated pollution) than they were w/o the solar. The solar undid the draw/pollution from adding EV!
So we can see, adding solar cuts their grid pollution, and adding an EV increases the grid pollution. It makes no difference if they are done together or separately, one before the other or vice-versa. As I said earlier, they each need to stand on their own, there is no multiplier effect.
So there is no justification for saying that having solar means they are charging their EV in a 'clean' way. The EV must be measured against other available vehicles. I can buy a pure hybrid and buy solar too. So compare apples-apples.
Will you be able to break this news to your neighbors?
-ERD50