RUFUS HOUND

billbullock and score76 if you want to private message me with your comments Im fine with that !

Rosemary

Continue to discuss the subject on the forum by all means but offering to complete work/touting for business/advertising is against the rules which means that this cannot be achieved in the PM system either.

Rosemary

RUFUS HOUND

Can somebody please confirm what the max allowable solar pv system is for a domestic property - is it now 30KW

I am having great difficulty finding up to date acurate info on domestic solar - I guess this is the Portuguese way - they will get round to it when they get round to it.

Any links much appreciated

RUFUS HOUND

as the comments were deleted I did not know what they had written so sorry if any rules were broken

Rosemary

You have not broken any rules so no need for you to apologise. The comments needed to be deleted due to rule 9 which also covers PM´s. If the conversation ended up being by PM as you were suggesting and the rule was broken the members would have their membership terminated.

Rosemary

RichardHenshall

I believe that (for grid-tied) you can generate twice your potência contratada but can only feed in to the grid a power equal to your potência contratada.

Of course the payback comes from not buying electricity that you were using anyway, so it's the panel(s) that deliver the first few hundred watts that pay for themselves first by powering your phone chargers, computers, clocks, TVs on standby etc. Thereafter there are steadily diminishing returns.

RUFUS HOUND

so it all depends on what contracted power rate you have selected - This is one hell of a bizarre system to operate, if you have to make a rough guess on your max power need and if go above your contracted power band, a trip will turn your whole house power off!!!! WTF

RichardHenshall

Those limits seem reasonable to me if it's a system designed for self-consumption while grid-tied. If you're looking at generating wholesale power to sell to others the limits (and licencing hurdles) will probably be higher.

The sweet spot for self-consumption is somewhat lower than your peak consumption (which typically needs to be less again than your potência contratada to avoid tripping). Your maximum feed-in might be half (?) your peak consumption rather than twice. There's no real value in buying another half a dozen panels just to allow you to boil a kettle a few times during the day.

If you have a sustained power hungry requirement such as pool filtration or borehole pumps it may be viable to set that up as a standalone off-grid solution.

RUFUS HOUND

What limits are you referring to?

RichardHenshall

The ratio between contracted power and allowable feed-in.

RUFUS HOUND

ok - so if I am contracted to say 5kw - theoretically I can have a 10kw PV system but only export 5kw of that

RichardHenshall

I believe so. But why would you want to generate as much as 10kW if you only want to pay to use 5kW (and are only actually using 5kW)?

RUFUS HOUND

it was just an example to see if I understood correctly - I would only fit 4 to 5kw anyway mainly to cover aircon

In the uk its easy - 4kw max for domestic production end of story.

liveaboard

Don't forget that the numbers supplied by the PV makers are largely fiction; you might get that much power at the equator at noon, or in outer space, but rarely on your roof.
If you install "5kw" of panels, you likely get half that or less, except for an hour a day, and that only if the sky is clear.

BillBullock

I've gone right off the desire to buy PV panels for producing electricity in the winter months since reading posts on this forum.