Great blog & thanks for participating in the ERIC Pilot. On the payback, Moixa's unique UK GRIDSHARE service also offers (non pilot) purchasers £75 back a year on a rolling 5 year contract. This is possible via Moixa's GridShare Virtual Power Plant service, which can access income from network and national grid opportunities. This helps improve payback, providing end users - the daily solar benefit you mention + a grid share income. In addition as more new time tariffs appear, there should be additional benefits but is likely to involve switching tariff/utility. David, http://www.meetmaslow.com