Forums
Renewable Heating
Solar Thermal & Pow...
Advice on improving...
 
Notifications
Clear all

Advice on improving self use for solar energy generated?

 
Solar Thermal & Power Diverters
Last Post by IanMK13 9 months ago
3 Posts
3 Users
0 Reactions
544 Views
RSS
 energy-optimiser
(@energy-optimiser)
Active Member Member
Joined: 9 months ago
Posts: 5
Topic starter 15/08/2024 5:33 pm  

Hello there, I've been thinking about exploring solar panels, day/night tariffs and maximsing self use. Any tips on how one can improve self use of solar energy, especially for appliances and EV charging -- rather than importing from the grid. Any one here that has done this well? Happy to connect offline if easier.


   
Quote
 Johnmo
(@johnmo)
Prominent Member Member
Joined: 2 years ago
Posts: 424
15/08/2024 6:55 pm  

Really depends if you get paid for export and how much you get paid per kWh.

We don't get paid. So will talk about my case.

Without a battery anything more than 3.2kW you end up exporting quite a bit in summer. Unless you dump to immersion and hot water. Even in NE Scotland and quite a bit of shade we didn't really pay for hot water in summer.

We then added another 3.6kW PV and 13.5kW battery, ASHP and moved to E7.

According to our weekly reports our summer average cost per kWh used is about 4p and Jan Dec was 20p kWh driving a heat pump (we had 2 weeks at -9 also).

Battery is best way to self consume. We still use immersion diverter. Last cylinder heat was yesterday at 4am, next one will be tomorrow morning (so 48hrs). Which is good as we have had a poor solar day today, so didn't use the battery to heat DHW. We still import, mainly due to a pretty poor summer, on average 4 to 5kWh. But that includes running ASHP on cooling mode, MVHR, sewage treatment plant fan our base load is around 17kWh.

Maxa i32V5 6kW ASHP (heat and cooling)
6.5kW PV
13.5kW GivEnergy AIO Battery.


   
ReplyQuote
 IanMK13
(@ianmk13)
Reputable Member Member
Joined: 2 years ago
Posts: 194
15/08/2024 7:47 pm  

I've been on Octopus Agile ToU tariff for 10 months now.  I have an EV but don't use it a lot, so this is the best tariff for me (No ASHP. Gas DHW & CH). Annual consumption ~5MWh.

I had solar panels (5kWp) and battery (13.5kWh) installed on 1st July and have paid only standing charges since then, saving approximately £80 in 6 weeks.  I've exported 380kWh to the grid so far but not been paid for it (waiting for the DNO to get their finger out!), nominally worth £57.

Come winter, I'll be playing tunes on the battery, charging at cheaper overnight rates, so improving on what I achieved last winter without a battery.


   
ReplyQuote
Forum Jump:
  Previous Topic
Next Topic  



Share:

Join Us!

Trusted Installers

Struggling to find a reliable heat pump installer? A poor installation can lead to inefficiencies and high running costs. We now connect homeowners with top-rated installers who deliver quality work and excellent service.

✅ Verified, trusted & experienced installers
✅ Nationwide coverage expanding
✅ Special offers available

👉 Find your installer now!

Latest Posts

x Powerful Protection for WordPress, from Shield Security
This Site Is Protected By
Shield Security →