18 hours ago, khunPer said:

I was seriously considering solar panels when I build my house that was completed in 2010. Based on 4 baht per unit (kWh) as saved money, using one's own solar production, it would take me little more than 17 years to bay back the investment, not included interest – for example loss of bond market interest for money invested in solar cells etc. – and maintenance. The life-span of a system, without major maintenance or replacement of inefficient solar panels, would likely be around 20-years.

 

The price of solar cells has gone down a bit since then, and the solar cell panels may also be little more effective now, so perhaps ends will meet with a system saving some electric, but selling at 2.50 baht or less, seem still like too low (I haven't tried to calculate).

 

In my European home country, solar cell installations on private roof-tops exploded a few years ago – even my native home has less sun than Thailand, however much longer days in the summertime – but the economy was based on tax relief for the investment, and overpriced payment per unit (kWh), where all electric users pay an extra tax to compensate the higher costs of so-called "green energy" from sun and wind.

 

Perhaps a few more years, where for example roof-tiles are solar cell panels – SCG investigate in making that in the future – and efficient storage batteries at a reasonable cost, will make a change.

The little nanny state in northern Europe got everybody to pay for their own rooftop solar system and then the government changed the solar billing cycle from yearly to quarterly, which make a big difference when you have a sunny summer and long dark winter. Scandinavian state corruption at its best.

11 minutes ago, ExpatOilWorker said:

Very impressive you are a net contributor to the grid. What is the size of your solar system (m2)?

What is your average electricity consumption?

20 m2 roughly producing 19.95 kw per day on a 7 hour day of sunlight,  my consumption is roughly 9 kw, if I have to get scientific for money purposes then a meter of direct current can be installed , 

5 hours ago, leeneeds said:

The new meters do not go backwards, as the old ones used to go flat out backwards, then at night what ever power you used the meter would go forward but would never reclaim the distance lost, The reading always took place during the day when maximum power was produced by the panels and the reader of the meter could not read properly as the meter was going back so quickly, after being threatened to be cut off from the grid, because the company boss did not understand solar, I managed to get a Thai, professional to talk to the power co, 

the end result was I was charged 40 baht per month, 

I was happy with that, but calculated power produced during the day would have given me a return on my investment and putting power into the grid for the company to use, 

So if in all this I go back to a minimal bill, or if completley fair business outcome on deregulation,  then a small return for my power given,

Authorities don't want meters to run backwards, as they still need their taxes and various fess, like for example grid costs and maintenance, so they'll only pay the solar-power suppliers the market cost of electric unit (kWh) production; which in a way makes sense. However, your internal power consumption saves you both power-production cost, and taxes, and fess...