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Bev
Rank 4
Rank 4
September 28, 2021

Is a Home storage battery our 'missing link' (and do specialist advisors exist for this stuff?)

  • September 28, 2021
  • 46 replies
  • 898 views

Hello
We’ve had a 3.7kw solar pv set up on our roof for 8 years, we’re in East Sussex. We were lucky enough to come in on the tail end of the feed-in tariff, so it has almost paid for itself. We don’t have a Smart Meter so our export is assumed to be 50% for the tariff, we know we don’t export that much as we also run our business from this building so we’re always here. We’ve had a 100% Electric car for 4 years (Leaf), and this summer we had a Heat Pump installed as part of the OVO trial. We don’t yet know how our bills will look this winter without gas, we have a multi fuel burner as back-up. We didn’t have a water tank with our gas boiler so didn’t have an iBoost-type gizmo fitted, which means our excess solar does not currently heat our water. 

So…  battery storage. Our mission for this house is to future proof it so far as possible, and get the running costs down as low as we can.  Our local installers have had issues trying to get Tesla batteries, there seems to be a waiting list. They’re currently testing other storage batteries. 

Meanwhile our Leaf is a Tekna and we bought it with Vehicle to Grid/Home in mind, sort of thinking ‘have this instead of a battery pack’. But the impression we have at the moment is that isn’t possible yet as trials are still ongoing (if anyone has another experience I’d be delighted to hear it!)

I have been reading these forums for the past week, trying to get my head around whether storage is the missing bit of the puzzle for us.  If I’m honest, my brain is melting a bit. If we go to an installer and they say ‘you need this’, we won’t ever know what other options we had or whether we’re doing the right thing.  Plus we have the dilemma of potentially switching energy suppliers, knowing that getting a Smart Meter would probably reduce our FIT payments, but then again… some companies offer attractive rates with a Smart Meter, so it might be a better option for us. Would it be worth it for us to pay someone independent to look at our entire set-up and advise? We’re wondering would that be money well spent v spending a load on (say) a battery only to realise that wasn’t the solution we needed. Do such advisors exist?

Thanks for reading, any suggestions would be much appreciated.

46 replies

Jess_OVO
OVO Staff
OVO Staff
October 7, 2021

A great example of how human-centric lighting could work, @Transparent

 

We’d always appreciate one of your very well researched guides, would this help?:

 

:joy:

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Transparent
Rank 20
Rank 20
October 7, 2021

Thanks @Jess_OVO  :kissing_heart:

And what if I told you that I can find a way to charge the battery for that ‘night-time smart lighting’ for free?

If Flex is up for the challenge, I can foresee a way to use the electricity which otherwise gets wasted at the substation due to phase-imbalance when you operate your Smart chargers overnight. :money_mouth:

And at this point I’m wondering if I should move further comment into the Tech Treehouse for discussion out of the public eye?

Save energy... recycle electrons!
Jess_OVO
OVO Staff
OVO Staff
October 8, 2021

We may be wandering a little far off-topic now, @Transparent, although by all means a topic about the possibilities of flex-powered lighting could be one for the Tech Treehouse.

 

It might be more helpful for this thread to hear how others with an Air-Source Heat Pump are making use of the storage possibilities currently available - @jenthomson I seem to remember you having a Tesla Powerwall alongside your ASHP, all powered by a TOU tariff - how are you finding this set-up is coping with the colder temperatures? :snowflake:

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Tim_OVO
OVO Staff
OVO Forum Legend
October 8, 2021

Some interesting news to share here with regards to Kaluza, energy storage, and a decarbonised energy grid:

 

Kaluza announcement:

 

Today, we are delighted to announce our new balancing service for National Grid ESO with Flexitricity!

In a UK first, 
Kaluza and Flexitricity will provide a new combined flexibility service in the Balancing Mechanism, unlocking the potential of electric vehicles through smart chargers and V2Gs, as well as storage batteries, to provide a much-needed balancing resource for the grid and lower costs for customers. 

“Today, industrial batteries provide the majority of our system’s flexibility while the storage potential of millions of smart devices in homes goes untouched. This partnership is an important milestone for the industry in enabling end customers to play a role in a greener, cheaper and more resilient energy system, and be rewarded for it,” comments 
Marzia Zafar, Kaluza’s Director of Policy and Sustainability. 

 

Sounds exciting, Kaluza! What do we think forum members? 

Carbon neutral - we need a community to get there! My green tech: Aclara SGM 1411-B smart meter, Chameleon IHD6
Jess_OVO
OVO Staff
OVO Staff
November 11, 2021

How are you getting on with the battery considerations, @Bev?

 

If you’re still undecided our content team have just written this great guide which might help:
 

In summary, is it worth getting a solar battery?

 

This all depends on how much energy you’re generating, and if you have a lot of excess that you need to store. For big homes, with occupants who are mostly out during the day and home in the evening, it makes more sense. 

It’s worth considering that battery prices will drop, so if you’re thinking about it now, why not get a few quotes, and then keep an eye on the market?

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Newcomer
May 2, 2022

I have only got a heat pump and new glow worm boiler  and new radiators. But the elect gone through. The roof. And hardly any gas used. 

Jess_OVO
OVO Staff
OVO Staff
May 3, 2022

Hi @JanB57 and welcome to the OVO online community,

 

A really important point to raise here about making sure your heating system is running as efficiently as possible. Just to clarify is the heat pump you mention an Air Source Heat Pump? If so we’d recommend checking out this related thread:
 

 

As you also mention a new boiler, I’m not certain if this is a hybrid system? Let us know a few more details as I’m sure our community members would be happy to offer advice to help.

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Rank 5
March 12, 2023

Im just in the middle of weighing up the economics of battery storage.  I have oil-fired ch, (boiler 3 years old) ,thermal panels, 2.45KW solar panels installed 2011 , and current usage of 3200 KWH annually.   Immersion heater for H/water never used though installed, very large cylinder installed.

Incoming quotes for battery storage vary between 3.3 and 5.5 KW storage and prices from £4800 to £6000 plus Vat for installation.

How can I check a) battery the right size

                                b) the calculations for payback time are correct? - and how are these done?

We are in the house all day.   getting full FIT and now SEG at 6p/kW on actual export ( but this is too recent to offer accurate info)

Should I wait for accurate export Kw ( say 12 months) before acting on battery storage installation?

Help please!

 

M.isterW
Rank 6
Rank 6
March 12, 2023

I assume you know how much you've exported in previous years so you could use those figures to help calculate a payback time.

As for what size battery to get, there are people who will say go as big as you can afford but you then risk never recouping the cost. Other people say get enough to get you through the night, which is more sensible but the hours of darkness change.

I would go as big as you can while maintaining a sensible payback period. 5.5kWh isn't a very big battery so you could go bigger if the figures add up.

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊
M.isterW
Rank 6
Rank 6
March 12, 2023

If you want a second pair of eyes to look at your calculations, post them and I'll be happy to have a look. I'm no expert but I'd did a fair amount of cost benefit calculations when we were considering solar PV.

1992 4 bed detached house. Solar PV + battery, Zappi EV charger, Mitsubishi Ecodan ASHP and i-life2 fan assisted radiators.... No gas 😊