The Boy That Cried PV Extension

Don't keep it to yourself - we want to see it
Mart
Posts: 1314
Joined: Mon Jun 14, 2021 1:17 pm

Re: The Boy That Cried PV Extension

#101

Post by Mart »

Yep, gotta love cheap rate!


And in further news, I've just completed an exhaustive and comprehensive upgrade of the kitchen heating system, voila :-

Image
8.7kWp PV [2.12kWp SSW + 4.61kWp ESE PV + 2.0kWp WNW PV]
Two BEV's.
Two small A2A heatpumps.
20kWh Battery storage.
User avatar
Stinsy
Posts: 2885
Joined: Wed Jun 02, 2021 1:09 pm

Re: The Boy That Cried PV Extension

#102

Post by Stinsy »

Stinsy wrote: Sun Nov 24, 2024 3:54 pm Funny you mention it but my bill just dropped:
For completeness here's my gas bill:


Image
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger

(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
Mart
Posts: 1314
Joined: Mon Jun 14, 2021 1:17 pm

Re: The Boy That Cried PV Extension

#103

Post by Mart »

My bill should arrive in a few days. Gas should be similar to yours, with the bulk being standing charge. Quite a change compared to previous Novembers. Jan gas consumption tends to be higher on average than Dec, but not much. So looking forward to not (fingers crossed) using the GCH during the month, and becoming part of the HP world, or HP light perhaps, but if it works, it works. :xx:

Update on the fan ..... it really works, and I'm shocked. I assumed it had to work a bit, but wasn't expecting much. However on setting 1 (of 3), it's blasting air into the kitchen and the temp on the opposite side window has gone up about 1C. It actually went up a bit more, but the temp outside has also risen. Whilst that won't impact the temp of the air in the conservatory (just the COP), it will affect the temp near the outside window.

Temp around 20C at the window, and around 23.5C in the conservatory (21C in living room). That's with 'pre-loading' overnight. In the morning I turn the unit down a degree on the setting, and the temps drop about 1C all round.

Battery powerstation arrived. Looks great, but lower charge rate as I feared. It actually charges at ~300W, but at 400W I would have been able to manage an 80% charge on cheap rate. Also the fan is noisy when charging. Live and learn.
8.7kWp PV [2.12kWp SSW + 4.61kWp ESE PV + 2.0kWp WNW PV]
Two BEV's.
Two small A2A heatpumps.
20kWh Battery storage.
Mart
Posts: 1314
Joined: Mon Jun 14, 2021 1:17 pm

Re: The Boy That Cried PV Extension

#104

Post by Mart »

Hi Stinsy, bill has now arrived, shockingly low, especially for a heating month.

Image

Image

Looks like about 0.5kWh of day rate leccy is sneaking through each day. I can live with that. :)
8.7kWp PV [2.12kWp SSW + 4.61kWp ESE PV + 2.0kWp WNW PV]
Two BEV's.
Two small A2A heatpumps.
20kWh Battery storage.
User avatar
Stinsy
Posts: 2885
Joined: Wed Jun 02, 2021 1:09 pm

Re: The Boy That Cried PV Extension

#105

Post by Stinsy »

c. 1.9% of your total electric being peak is doing really well. You'll always get some because it takes a while for your inverter to react. Therefore devices such as induction hobs, clothes irons, etc. will always result in a smidge.

I managed c. 1.7% of my electric being peak, but then I use way more than double the electric you do.
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger

(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
Mart
Posts: 1314
Joined: Mon Jun 14, 2021 1:17 pm

Re: The Boy That Cried PV Extension

#106

Post by Mart »

Stinsy wrote: Thu Nov 28, 2024 2:20 pm c. 1.9% of your total electric being peak is doing really well. You'll always get some because it takes a while for your inverter to react. Therefore devices such as induction hobs, clothes irons, etc. will always result in a smidge.

I managed c. 1.7% of my electric being peak, but then I use way more than double the electric you do.
Yep, you are spot on, it's tea time when I think most of it tunnels in when we aren't looking. Micro-waves, induction, and also the simple fact that the inverter is capped at 3.68kW, so very easy to go over that when several items are in use. But of course the power topping 3.68kW doesn't matter too much, as the time/energy is quite low.

Definitely starting to think more seriously about ditching gas. If the oven and DHW are so relatively small, then cheap rate HW tank heating, and some daytime import when cooking won't dent the leccy figures too much.

Roll on January to see what I'm missing, and how much of a sustained cold period the A2A units can cover. I'll curse myself now by suggesting it's looking better than I expected.

Unpleasant/pleasant surprise this morning. We had a powercut at about 7am. DNO advice was that it would be back on by 8.30am, so with the recent powerstation purchase, charged overnight, we ran one of the A2A units. If the estimate had been for longer / later in the day, then I would have plugged the freezer in. Still not convinced I made the best decision, but a bit more pleased with this week's new toy. And power came back on around 8am, then went off again just before I could post a long comment. Back again then 10mins later.

Bonus win - our old combi doesn't have any battery backup of the settings. So when we get even a brief powercut, I have to enter all the heating program times again, and reset the clock. But today (twice) I simply changed it from on to off (DHW stays on) and walked away - Smug Mode. Sometimes it's just the little wins.
8.7kWp PV [2.12kWp SSW + 4.61kWp ESE PV + 2.0kWp WNW PV]
Two BEV's.
Two small A2A heatpumps.
20kWh Battery storage.
Mart
Posts: 1314
Joined: Mon Jun 14, 2021 1:17 pm

Re: The Boy That Cried PV Extension

#107

Post by Mart »

Just checked back to Nov 2023 and leccy consumption was 463kWh and gas was 781kWh.

So very roughly, looks like leccy is up ~270 units, and gas down ~700. But will also depend on weather, and BEV charging/use. So just a guide.
8.7kWp PV [2.12kWp SSW + 4.61kWp ESE PV + 2.0kWp WNW PV]
Two BEV's.
Two small A2A heatpumps.
20kWh Battery storage.
User avatar
Stinsy
Posts: 2885
Joined: Wed Jun 02, 2021 1:09 pm

Re: The Boy That Cried PV Extension

#108

Post by Stinsy »

I have 2x 16A ovens and a big 900mm induction hob. My 3.6kW inverter does just fine!

Combi just there for DHW at the moment. I've long had a plan to put a tank in but that can had to be kicked down the road...
12x 340W JA Solar panels (4.08kWp)
3x 380W JA Solar panels (1.14kWp)
5x 2.4kWh Pylontech batteries (12kWh)
LuxPower inverter/charger

(Artist formally known as ******, well it should be obvious enough to those for whom such things are important.)
User avatar
Joeboy
Posts: 8151
Joined: Mon May 31, 2021 4:22 pm
Location: Inverurie

Re: The Boy That Cried PV Extension

#109

Post by Joeboy »

Mart wrote: Thu Nov 28, 2024 4:06 pm
Stinsy wrote: Thu Nov 28, 2024 2:20 pm c. 1.9% of your total electric being peak is doing really well. You'll always get some because it takes a while for your inverter to react. Therefore devices such as induction hobs, clothes irons, etc. will always result in a smidge.

I managed c. 1.7% of my electric being peak, but then I use way more than double the electric you do.
Yep, you are spot on, it's tea time when I think most of it tunnels in when we aren't looking. Micro-waves, induction, and also the simple fact that the inverter is capped at 3.68kW, so very easy to go over that when several items are in use. But of course the power topping 3.68kW doesn't matter too much, as the time/energy is quite low.

Definitely starting to think more seriously about ditching gas. If the oven and DHW are so relatively small, then cheap rate HW tank heating, and some daytime import when cooking won't dent the leccy figures too much.

Roll on January to see what I'm missing, and how much of a sustained cold period the A2A units can cover. I'll curse myself now by suggesting it's looking better than I expected.

Unpleasant/pleasant surprise this morning. We had a powercut at about 7am. DNO advice was that it would be back on by 8.30am, so with the recent powerstation purchase, charged overnight, we ran one of the A2A units. If the estimate had been for longer / later in the day, then I would have plugged the freezer in. Still not convinced I made the best decision, but a bit more pleased with this week's new toy. And power came back on around 8am, then went off again just before I could post a long comment. Back again then 10mins later.

Bonus win - our old combi doesn't have any battery backup of the settings. So when we get even a brief powercut, I have to enter all the heating program times again, and reset the clock. But today (twice) I simply changed it from on to off (DHW stays on) and walked away - Smug Mode. Sometimes it's just the little wins.
This encouraged me to check low/high rate consumption here. 3.3% at high rate. I'd be happy with if I hadn't seen you guys figures! :lol:

Image

I am looking forward to the 5th Dec for the official gas meter removal. Although Octopus have agreed to backtrack on that meters s/c as they're late in removing from initial query.

Using my hallyracket man maths that's £102.60 pa not going to gas s/c. Spending that on the heat pump at night rate and going on Fintray's current.scop of 4.4 that's....6,449 kWhs of heat 🥵. Jings!
19.7kW PV SE, VI, HM, EN & DW
Ripple 7kW WT & Gen to date 19MWh
42kWh LFPO4 storage
95kWh Heater storage
12kWh 210ltr HWT.
73kWh HI5
Deep insulation, air leak ct'd home
Zoned GCH & Hive 2
WBSx2
Low energy bulbs
Veg patches & fruit trees
User avatar
Krill
Posts: 396
Joined: Fri Sep 02, 2022 4:38 pm

Re: The Boy That Cried PV Extension

#110

Post by Krill »

I just checked my bill for October.

~450 kWh of electricity used, 0.7 kWh of peak rate (Octopus Cosy, 3 hours), ~13 kWh of day rate. So around 3% not cheap rate.

Luxpowertek aren't the most responsive, but the ability to parallel and turn the second inverter on and off does wonders.

Anyone got an below 1%?
Solar PV: 6.4kW solar PV (Eurener MEPV 400W*16)
PV Inverter: Solis 6kW inverter
Batteries: 14.4kWh LiFePO4 batteries (Pylontech US5000*3)
Battery Inverter: LuxPowertek 3600 ACS*2
EV: Hyundai Kona 65kWh
WBS: 8kW Hunter Avalon 6 Multifuel burner (wood only)
Post Reply