Would you do it again?

rugbyleague

DNO approved

Back in the game! Should I have gone even bigger than 6kw system?

Martyn1981

rugbyleague wrote: »

DNO approved

Back in the game! Should I have gone even bigger than 6kw system?

Good news. What approval (inverter size) do you have?

Mart.

rugbyleague

Hi Mart

Glad to be back feel like I have been in the wilderness waiting for the DNO, I think I have permission for upto 6KW, I did wonder whether I should go bigger just because I can though......

Ian

Martyn1981

rugbyleague wrote: »

Hi Mart

Glad to be back feel like I have been in the wilderness waiting for the DNO, I think I have permission for upto 6KW, I did wonder whether I should go bigger just because I can though......

Ian

Big, bigger, biggest ..... there's no stopping you now!

If you've got permission for a 6kW inverter, then 7-7.5kWp of PV will run fine. At sunny quiet times you'll be greening most of the street!

Mart.

tunnel

rugbyleague wrote: »

DNO approved

Back in the game! Should I have gone even bigger than 6kw system?

Flippin eck, that took some doing but at least the end result is right
Still time to get in too before the rate drops on October. I know it's not much but in the words of Tesco "every little helps"
T

rugbyleaguesmate

Thanks all, i'm now back under a new user name because of password issues.......I simply can't keep on top of them all.

Ok guidance required please? Have 2 verbal quotes and one soon to be supplied.

6 KW System solaredge invertor and display £6200 battery ready (Solar edge invertor will not take more than 6KW)
7.5 KW System Tesla invertor and display £7200 battery ready
7.5 KW System non battery ready display ready price to be confirmed.

Question would the math's work for the Tesla system i.e. would the extra £1000 for the invertor and the more expensive panels be justified?

Ian

Martyn1981

Hello Ian - that threw me "Tesla inverter" had to go looking. Doesn't seem to have anything to do with 'the' Tesla, but live and learn, live and learn.

Forgetting the inverter for a moment, and not trying to be pedantic (honest) but the larger system is, to my brain, cheaper, not more expensive:-

£7,200/7.5kW = £960/kWp v's
£6,200/6kW = £1,033/kWp.

But both are excellent prices, truly excellent prices.

Not completely sure what you mean by the SE inverter not taking more than 6kW. Do you mean they don't do a bigger inverter than 6kW, because I'd have thought 6kW was a really good size for 7 or 7.5kWp of PV.

The data sheet does say a max 6kW output (AC), but it can cope with 8.1kW of DC.

Inverters can be connected to more capacity, as they simply 'take' as much as they need, so 'leave' what they can't cope with. But 6kW/7.5kWp wouldn't cap too much, or too often. [Caveat, SE systems are a bit different, so there may be a max based on panels since they use a single string linking all the PO's.]

Regarding the maths, remember that whilst the cost of a bigger system goes down proportionately, the leccy savings will also drop (proportionately). Panel 1, you'll use 100% of generation, panel 2 less than 100% as baseload will be less than gen at times, and so on and so on as you add more panels.

My original 3.6kWp saved me about £140. The additional 2kWp added about £30 more in savings.

Damn those are good prices, did I mention that?

Edit: Just a thought regarding the size of the system, but do you think there's a reasonable chance that you might get an EV in the future, which might be (could be) parked up in the daytime, a few days a week? M.

Mart.

rugbyleaguesmate

Martin thank you for this again.

Sorry i've mixed my drinks here a bit. Have physical quotes mailed to me and I under advised what I put in my previous post. The bones of the quotes are below and covers install scaffolding etc etc interestingly no tesla in the quote.

'Not completely sure what you mean by the SE inverter not taking more than 6kW. Do you mean they don't do a bigger inverter than 6kW, because I'd have thought 6kW was a really good size for 7 or 7.5kWp of PV.

The data sheet does say a max 6kW output (AC), but it can cope with 8.1kW of DC.

Inverters can be connected to more capacity, as they simply 'take' as much as they need, so 'leave' what they can't cope with. But 6kW/7.5kWp wouldn't cap too much, or too often. [Caveat, SE systems are a bit different, so there may be a max based on panels since they use a single string linking all the PO's.'

Understand thanks for your explanation I was led to believe that because than 6kw could be produced that the solar edge would not be appropriate.

Quote1

23 Canadian solar 265 w panels solax su5000e hybrid inverter £6625 6.1kw

Quote 2

24 Ja solar smart module 280w panel solar edge se 6000 inverter £ 7683 6.9kw

Quote 3
24 Ja black frame 280w panel samil 6000 TLD Inverter £6901 6.72kw

Quote 4

24 Ja solar 295 w panel samil 6000 TLD inverter £7380 7.1kw

I think quotes 1 and 2 are battery ready?

Sorry Martin et al and without pressure will you pick one........!

Or maybe suggest a combination?

Thank you

Martyn1981

rugbyleaguesmate wrote: »

Sorry Martin et al and without pressure will you pick one........!

Screwfix have barge poles on back order, so I won't be able to not touch that request for a few days!

Stay calm, and carry on.

Nice prices though, all in the region of £1k/kWp. Quite impressive.

Mart.

rugbyleaguesmate

OK Martin understand sorry for putting you in an awkward spot......

So if I choose one which is battery ready, which produces lots of kws but not more than 8.1kw?

Any particular panel make?

Solar edge se6000 the right invertor?

Sorry again

Ian