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Battery storage to run Heat Pump.

 
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Energy Storage
Last Post by Transparent 4 days ago
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 Scalextrix
(@scalextrix)
Reputable Member Member
Joined: 1 year ago
Posts: 117
13/10/2025 4:12 pm  

@transparent Eleven Energy have a full Sodium-ion system with inverter, no recommendations



   
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
Famed Member Moderator
Joined: 4 years ago
Posts: 1168
13/10/2025 4:24 pm  

Posted by: @scalextrix
↑

...

I'm hopeful that the newer Sodium Ion chemistry launched by BYD for their small affordable domestic car market may soon find it's way into stationery battery storage.

...

16 sodium atoms walked into a bar, followed closely by a masked man in a cape.

 

 

...

 

 

Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Batman!

 

Sorry; couldn't resist. Taxi's already on its way.

 


105 m2 bungalow in South East England
Mitsubishi Ecodan 8.5 kW air source heat pump
18 x 360W solar panels
1 x 6 kW GroWatt battery and SPH5000 inverter
1 x Myenergi Zappi
1 x VW ID3
Raised beds for home-grown veg and chickens for eggs

"Semper in excretia; sumus solum profundum variat"


   
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Toodles
 Toodles
(@toodles)
Illustrious Member Contributor
Joined: 3 years ago
Posts: 2298
13/10/2025 4:48 pm  

@majordennisbloodnok I’m not sure you will be able to receive treatment on the NHS!


Toodles, heats his home with cold draughts and cooks food with magnets.


   
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 Batpred
(@batpred)
Honorable Member Member
Joined: 11 months ago
Posts: 251
14/10/2025 8:43 am  

Posted by: @transparent
↑

The concepts behind running inverter, BMS and battery combinations are just as important as the 'rules'.
You gradually get a feel for the subject matter.

That gut-feel is crucial in the learning curve to making decisions which are 'safe'.

Hats off to the ones that persist, @Transparent ! 😀

Not saying never again, tempting to think learnt enough and the next battery DIY assembly would be quick..😉

But those pleasant moments packing the cells into the box will not be easily decoupled from the weeks leading up to it... 😃

 


16kWh Seplos Fogstar battery; 8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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 AgentGeorge
(@agentgeorge)
Estimable Member Member
Joined: 10 months ago
Posts: 97
25/11/2025 4:42 am  

@jamespa I have 5kW PV and 5kW battery. By using the 8pus cheap rate and PV to charge the battery, for the months April thru October I averaged 98% on the cheap tariff, the battery was supporting the house after PV declined avoiding paying higher rates standard hours.

Now the temps have dropped below 8C, the HP is working harder and the battery is not big enough to support the house load.

I calculated adding a second 5kW battery would support the HP at 1.6kW max load Nov-Mch. The payback for this extra battery would be twice that of the first battery as it only pays back Nov-Mch, approximately 18 years assuming static electricity charges, 14 years if you assume 2.5% increase per year.

If I can get a second hand battery at half the cost of new and avoid fitting charges by installing it myself, I could justify a second battery. 



   
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 Batpred
(@batpred)
Honorable Member Member
Joined: 11 months ago
Posts: 251
25/11/2025 2:57 pm  

Posted by: @agentgeorge
↑

@jamespa I have 5kW PV and 5kW battery. By using the 8pus cheap rate and PV to charge the battery, for the months April thru October I averaged 98% on the cheap tariff, the battery was supporting the house after PV declined avoiding paying higher rates standard hours.

Now the temps have dropped below 8C, the HP is working harder and the battery is not big enough to support the house load.

I calculated adding a second 5kW battery would support the HP at 1.6kW max load Nov-Mch. The payback for this extra battery would be twice that of the first battery as it only pays back Nov-Mch, approximately 18 years assuming static electricity charges, 14 years if you assume 2.5% increase per year.

If I can get a second hand battery at half the cost of new and avoid fitting charges by installing it myself, I could justify a second battery. 

Personally, each extra 16kWh costing £1000, when adding battery capacity to the inverter, I am looking to minimise space near the inverter.  

On ROI, by exporting mostly at peak times, return from future PV production can also be improved.  

 


16kWh Seplos Fogstar battery; 8kW Solis S6-EH1P8K-L-PLUS hybrid inverter; Ohme Home Pro EV charger; 100Amp head, HA lab on mini PC


   
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Transparent
 Transparent
(@transparent)
Illustrious Member Moderator
Joined: 4 years ago
Posts: 2760
25/11/2025 3:25 pm  

Posted by: @agentgeorge
↑

Now the temps have dropped below 8C, the HP is working harder and the battery is not big enough to support the house load.

I calculated adding a second 5kW battery would support the HP at 1.6kW max load Nov-Mch.

That comment is welcome, but can be read in two different ways.

Since others will be reading here in future, I'd like to add some clarity.

If you need more power into the home from your battery storage system, then you add another inverter.
That allows more watts to be delivered.

If you want more stored energy, then you add another battery.
That allows you to supply the home for a longer period of time. 

 

You might need to do both, because these two concepts interact.

Adding a second inverter will drain the battery faster, potentially leaving you without enough stored energy to last through the night.

 


Save energy... recycle electrons!


   
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