7.3 kW Bi Facial Rooftop Panels: ~7 year ROI: Fact OR fiction?

Martyn1981

Screwdriva wrote: »

And finally, Bulb Energy has confirmed that I am now on their SEG tariff. They're trying to raise an export MPAN for my smart meter - no idea what that means!?!

Graph below:
https://imgur.com/a/BWoGnPV

Hiya. Your leccy supply will be identified by a unique MPAN (Meter Point Administration Number), so effectively they are matching your export to you and that specific property/supply.

When you switch leccy and gas, this is how your accounts are identified.

Screwdriva

Thanks Marty!

Finally hit the double O today. 8.47 kW, a new high for the system, in a nice linear spread of power lasting till 4:15pm.

https://imgur.com/a/l7ddTjm

Hexane

Screwdriva wrote: »

8.47 kW, a new high for the system

That sounds great, but you do mean kWh not kW!

Screwdriva

First full month complete. January netted 96.55 kWh. PGIS forecasted 154 kWh for my location so quite a substantial miss.

joefizz

Screwdriva wrote: »

First full month complete. January netted 96.55 kWh. PGIS forecasted 154 kWh for my location so quite a substantial miss.

Indeed. The only data that matters is your own data!

Screwdriva

Our first full use utility bill from Bulb Energy arrived yesterday coving the period from 22nd December to 1st of Feb (39 days). Some pretty important and somewhat surprising numbers:

Electricity used: 373 kWh @ £12.39p per kWh (total cost is £56.5 all inclusive)
Electricity generated from 22/12/19 -31/1/20: 120.5 kWh, which means that we consumed an additional 45.5 kWh or £5.5 of the power we generated.
Electricity exported to the grid: 75 kWh @ 5.38p per kWh (total earnings of £4)
Gas used: 2651 kWh @ 3.5p per kWh (total cost is £105 all inclusive!!)

Consumption of solar energy appears to be 40% with 60% exported. Also, we've never paid anywhere close to this much for gas before but we do use it for hot water, heating (HIVE temperature set at 16.5 degrees) and cooking in the new home. A couple questions come to mind:

1) Does the above look normal for a 3 bedroom semi detached? If so, the ROI on this system took a depressing spiral.
2) Would an iBoost make financial sense given the above. We're willing to reconsider if so.
3) Anything else proven that we can try to bring our consumption down? We've already done the following:

- Appliances like the dishwasher and washing machine run only during peak solar hours, and the fridge is set to economy mode.
- DC fans installed for circulation.
- LED lights everywhere
- Windows are new and double glazed. Leak free save for one.
- New 250L Megaflo Hot Water Tank
- HIVE Thermostat now set to heat water mornings only (vs. mornings + evenings in January)

Thanks in advance!

ABrass

It should be pretty much the worst case for both electricity and gas. Little sunlight and cold weather. The solar system in particular should only get better and the hours of use will also increase massively.

For gas it depends mostly on insulation. I've been in my house for a year and I'm still finding holes to seal up to reduce drafts.

Screwdriva

Still recovering from my last post. Today was our 2nd best day ever despite the cloudy afternoon. 8kWh on the dot.

Screwdriva

New high for the bifacial system yesterday. 9.44 kWh. Very confident it could have hit 10kWh if clouds hadn't shown up afternoon.

Detailed report here.

1961Nick

Screwdriva said:

New high for the bifacial system yesterday. 9.44 kWh. Very confident it could have hit 10kWh if clouds hadn't shown up afternoon.

Detailed report here.

 It was a perfect cloudless day up here ...