barry.perfect
Member
Do you still think Go would be better than TEP when you have to renew?5p and 15.59p
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Do you still think Go would be better than TEP when you have to renew?5p and 15.59p
Im on Octopus Go Faster until the end of this September, 13.5p peak and 5.5p off peak, just us two adults, gas cooker n boiler, I've been thinking we can live off the powerwalls, being charged up by solar atm, and still if they charge at off peak 5.5p, and I really don't like Tesla taking control of them, I'm diverting any excess generation straight into the Model S for free motoring when I can, think ill wait n see what happens to the price cap in the autumn and what Octopus offer when my Go Faster runs out in September.Out of interest, which Octopus Go Rate are you on?
When I did my maths (for my circumstances) Octopus Go was better whilst I am on my current rate of 5p off peak, 13.8 p peak, but when that expires (in Mar 2023) and it moves to the current rates then the Tesla Energy plan would be cheaper.
This is with 1 powerwall and 4.7KW solar
Take the average property, 8kwh electricity and 33kwh gas, and make it all electric, and no doubt more storage could make sense.Let's just run with your example of 70p per day (35p peak rate)
That's £255 per year. £2,550 over 10 years.
and... you've got the 13.5kWh capacity savings throughout each year on top of that. Be it stored solar, or cheap rate tariff.
13.5kWh per day at 35p = £ 4.72
13.5kWh per day at 7.5p = £ 1.01 stored cheap rate
Saving £1,354 per year. £13,540 over 10 years.
Makes using Heat Pumps very cheap.
... and we're not even talking ROI on free Solar mixed in
I paid £6500 for my second Powerwall, and we use it every single day. So it'll pay for itself.
Very unlikely as I do not want anyone other than myself controlling my power; there would have to be a major and not a minor cost saving.Do you still think Go would be better than TEP when you have to renew?
I wonder, could the Givenergy supply be included in the solar CT clamp? I guess the worry is, how do you stop the PWs from charging the Givenergy batteries?GivEnergy have just come back to me, and they've come up with an idea. So it could actually work.
The only thing they didn't know, is how this baseload power would register on the Tesla App data?
GivEnergy have just come back to me, and they've come up with an idea.
if any of that [excess] watts wasn't used, it would just get exported back to the Grid (and you'd lose it)
What is really need is a 2 megawatt battery that I can charge from solar over summer, store and use in winter
I'm not sure it is, for someone with an average consumption.
My own average usage is 14kwh a day outside of off-peak. So one powerwall won't cover it. Two will definitely cover it, either with solar charging the battery or batteries being charged in off-peak, to be then drained in peak.
But £8k for a second powerwall, to offset say 1kWh a day of peak usage? Let's say that's 35p shifted from peak to off-peak. 30p/day saving.
Let's say your peak usage is higher, at 15, or 16 kwh. And you want to shift perhaps 3 kWh a day from peak to off-peak to save 90p/day.
At an extra £8k for an additional powerwall, saving 90p/day... the payback period makes no sense.
I am now anticipating a response saying it's not about the payback period - but for 90% of people, the finances have to make sense and those who will just throw money at it to solve a problem that doesn't make financial sense, isn't much of a goer. That's reality.
I did some sums for how big a block of concrete I would need, and how high I would need to winch it in Summer ... to provide all my electricity generation in Winter. I thought I could just build it into the centre of the house ...
... the sums weren't favourable
Seasonal thermal energy storage might do for heat, but I dunno about seasonal electricity storage.
When I did my calcs a couple on months ago it was "slightly ahead" for TEP.Very unlikely as I do not want anyone other than myself controlling my power; there would have to be a major and not a minor cost saving.
just curious - what did you end up with?
maybe a Garden H2 generator?
Take the average property, 8kwh electricity and 33kwh gas, and make it all electric, and no doubt more storage could make sense.
My point was really about the average user, and not an extreme case. But acknowledge it works for you.
I'm in the South, so it's about 45p for electricity. I read that because "everybody" has electricity and only some people have gas, the costs born by Bulb (and the others) going into special admin was spread across everybody's standing charge. Martin Lewis had asked it be spread across the cost of energy instead - and another reason why he got sweary with the regulator! The cost just of Bulb going bad is well over £1bn every 6 months. They basically did not hedge their energy prices. So eg. 1.6 million people buying energy off them on their fixed deals at say 16p, but it costing them 25p/kWh!Nasty... sorry to hear that.
What's your new Standing Charge daily rate?
Bulb never offered fixed prices. Only variable. It’s the gvt price cap that killed them as they indeed did not hedge forward, and then couldn’t pass on the cost to the end-user. As a customer, I cannot complain, had a great deal for yearsI'm in the South, so it's about 45p for electricity. I read that because "everybody" has electricity and only some people have gas, the costs born by Bulb (and the others) going into special admin was spread across everybody's standing charge. Martin Lewis had asked it be spread across the cost of energy instead - and another reason why he got sweary with the regulator! The cost just of Bulb going bad is well over £1bn every 6 months. They basically did not hedge their energy prices. So eg. 1.6 million people buying energy off them on their fixed deals at say 16p, but it costing them 25p/kWh!
Quite the challenge there! Is there any way to get a rating for the water panel? Bring it back to fundamentals - how much benefit can it give you, and does removing it (£££ associated I assume?) allow more watts of PV to be installed? Would that pattern of install be more acceptable in terms of visuals?I've spent a few days going through every post in this thread. I've learnt more here than just about anywhere on the web (so thanks to all) and.....
I still haven't a clue as to what I need!
I'm moving back up north in a couple of months and looked at 4 houses, three of which have perfect, empty south-facing roofs but no, the missus decided on the fourth one which is SSW-facing and has an apex, 3 windows and a solar water heating panel on it:-
My Roof
The picture shown was from a full PV/battery quote generated by a UK-wide installer (all within 45 minutes of a call taking minimum details so kudos to them).
The 8 panels are 390W (Trina Vertex S) or 395W (Q Cells 395W Mono Q Peak Duo ML G9) and generate ~3.16 kWp with the estimated output being 2,686 kWh.
I asked about different panels to maximize output for the limited roof space (I've seen ads for 500W) but was told there isn't room for more/they aren't in stock anywhere/they cost much more.
Newbie questions:-
Should I continue looking for bigger wattage panels being stocked since I'm only going to get one shot at this system and don't mind waiting a bit?
Does anyone manufacture half-size panels for filling in the gaps? (can you mix panel models on a single string anyway?)
Should I get rid of the existing solar water panel to make a bit more space for PV panels or leave it alone? (It is attached to a Viessman boiler system apparently)
When comparing solar panels, what is the relevancy of the efficiency? Hasn’t it already been taken into account to calculate the output?