Solar PV + Battery quotes

mickyduck55

Petriix said:

You're missing the main issue with a post FIT solar battery: each kWh you use loses out on the SEG payment so the case for a battery is significantly worse than for those on deemed exports. For a new installation you have to deduct the lost SEG price from your savings calculation so it's only ~ 7p (less any round trip losses) saved per unit you self-consume. 

In theory you could sign up with Bulb for the SEG payments and Octopus for the incoming Agile tariff and do some load shifting to maximise the ROI but I wouldn't base a 10+ year investment on a beta tariff that may not exist next year.

I'm yet to see any convincing figures for anyone to come close to braking even on a battery inside it's warranty period, let alone post FIT. If you do go for a battery, don't pretend it's for the money savings.

I  think most of us who have bought battery technology realise its unlikely to be a sound financial investment.  I did it because I like the idea and Im on a good FIT so really just spending the money the panels generate to enhance my system.  If I look at the entire setup next year provided the panels continue to deliver I will have paid for my Solar system and batteries from FIT payments over the last 10 years

Solarchaser

Petriix said:

You're missing the main issue with a post FIT solar battery: each kWh you use loses out on the SEG payment so the case for a battery is significantly worse than for those on deemed exports. For a new installation you have to deduct the lost SEG price from your savings calculation so it's only ~ 7p (less any round trip losses) saved per unit you self-consume. 

In theory you could sign up with Bulb for the SEG payments and Octopus for the incoming Agile tariff and do some load shifting to maximise the ROI but I wouldn't base a 10+ year investment on a beta tariff that may not exist next year.

I'm yet to see any convincing figures for anyone to come close to braking even on a battery inside it's warranty period, let alone post FIT. If you do go for a battery, don't pretend it's for the money savings.

You know, there's something about the tone here that irks me, perhaps the idea that I've tried to mislead or the suggestion I'm lying (pretending) about savings... maybe it's just read text versus the spoken word, I dunno.

So the agile tariff, who knows, octopus is more reliable for any calculations as its a set amount.... thats why I chose it for the example. 
Is it likely to disappear,  highly unlikely given that more and more companies are offering what they call EV tarrifs.
Why? Well because the wind blows at night as well as during the day, and we are pushing big time into wind, so the electric companies will want people to take cut price electric overnight rather than have to curtail.

I'm not sure where you get 7p from, I explained my calculations,  I dont see an explanation from you, if you are assuming you lose the 5p from your 15p, that leaves 10p, or perhaps 8p after cycling assuming the 10% loss both ways, thats after round trip losses,  you suggest 7p before round trip losses?

But then that 10% is an arbitrary figure too, in reality it can be quite a bit less, in my own experience it's been less than 2% in some cases. I'm trying to use figures we can all work with through different systems, hence using the 10% rather than just my specific figures.

Anyway the thing about solar, and now with batteries,  it's about application.... and nuance.
But that takes a lot of explanation and I waffled on long enough.

I could talk about my deemed export of about 1600kwh as I'm on fit for my initial system and the fact I tend to export more like 3-5000 kwh historically, and my aim is to add more solar munching gizmos to reduce that export to less than the deemed, but thats specific to me.

We could theorise that abeezar is export limited to 3.68kw by his dno, and so his generation is reduced to 4-5000kwh and that changes all of the calculations... of course potentially the battery could sup up some of that "free" energy that would have otherwise be lost in export restriction.

I also did not go in depth about the mini cycling which is very common in the UK, where a bright morning fills the batteries, a cloudy mid day depletes them somewhat and a bright afternoon fills them again for use in the evening. 

You see? nuance!

Anyway to quote myself "you CAN make a 10 year roi work, but it requires effort and prep from you, its more likely to be a 12-15 year roi"

EVandPV

mickyduck55 said:

Petriix said:

You're missing the main issue with a post FIT solar battery: each kWh you use loses out on the SEG payment so the case for a battery is significantly worse than for those on deemed exports. For a new installation you have to deduct the lost SEG price from your savings calculation so it's only ~ 7p (less any round trip losses) saved per unit you self-consume. 

In theory you could sign up with Bulb for the SEG payments and Octopus for the incoming Agile tariff and do some load shifting to maximise the ROI but I wouldn't base a 10+ year investment on a beta tariff that may not exist next year.

I'm yet to see any convincing figures for anyone to come close to braking even on a battery inside it's warranty period, let alone post FIT. If you do go for a battery, don't pretend it's for the money savings.

I  think most of us who have bought battery technology realise its unlikely to be a sound financial investment.  I did it because I like the idea and Im on a good FIT so really just spending the money the panels generate to enhance my system.  If I look at the entire setup next year provided the panels continue to deliver I will have paid for my Solar system and batteries from FIT payments over the last 10 years

Yup, that's the position we're in after 9 years of FIT, PV and batts now paid for.