berend:

timmmay: It sounds like it's barely viable, and won't save any significant money until the system is fully paid off, by then it may need replacement or maintenance. I think the win here is for Vector, who keeps getting paid and reduces the load on their grid.

The people who did the calculations before signing up already told you so :-)

The sums don't work, unless we see substantial increases in electricity prices.

berend: Why have multiple car manufacturers, surely one would be more efficient! Just as one thought people would have learned from the experiences in the USSR, North Korea, and Cuba, then you learn that people don't learn from history.