I agree with the results of the survey. I don't trust most solar installers when it comes to telling the truth about the rate of return achievable from the investment - and the convenient ignoring that the money can never be got back - unlike if money sits in a bank, earns interest and can be withdrawn at any time (unless you're a RBS/NatWest customer!).
The problem is that people with often electrical and not fiancial qualifications are quoting extravagant returns on investment which cannot possibly be achieved. There is an incentive to do this in order to "wow" the customer in order to generate a sale.
A standardised approach to sales technique would be better (not just the SAP), and should give more confidence, such as:
The inflation/cost increase projections not reflecting just the past year's change in prices but reflecting multi-year trends rather than short-term blips (my cost per kWh is actually down by 5% year-over-year: how about projecting electricity prices to delcine?) .
All quotes use the same rate for RPI inflation.
All quotes use the same rate of increase for electricty bills.
Customers provided with FACTS on how good or bad the panels/inverters they're choosing actually are IN THE REAL WORLD, (not the "on paper" stats which seem to be meaningless) rather than trusting to luck.
There are huge online resources available if I want to buy a new car, or a new TV - I could find a thousand reviews of the product and get a rough idea of how good/bad it really is.
But with such a vast range of panels and inverters available, and no publicly available performance statsistics, how on earth can a customer choose? It's like some secret cartel with information which must never be made public.
Every Installer tells the customer that their panels are by far the best (best for profit margins or generating a sale, no doubt).
I don't mind paying more (or less) for panels, if someone can show me PROOF that it's worth paying extra. As for the much-hyped Sanyo panels, they seem to nowhere near justify the cost. I note that the rent-a-roofers use LDK (HomeSun) and other cheapish panels - perhaps they're giving a hidden message that extra expense doesn't reap much extra reward.