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Powerwall 3 or Myenergi or something else?

 
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Majordennisbloodnok
 Majordennisbloodnok
(@majordennisbloodnok)
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Joined: 4 years ago
Posts: 1631
22/09/2025 11:17 am  

Posted by: @old_scientist
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It is true that you can buy a Fogstar 16kWh battery for around £1750 whilst a comparably sized Tesla Powerwall expansion pack will cost in the region of £4000-£5000 (Octopus are offering them at £3773 installed)

However, the Fogstar is not IP rated for outdoor use and has no active thermal management so will find it's usable capacity and charge rate significantly diminished in winter, just when you need it most if relying on it to power a heat pump. Not everyone has the capacity to locate a battery indoors or wants a battery inside the house (I'm looking at my wife), at which point you are going to pay significantly more for a product with IP67/IP55 rating and that has active thermal management to keep the cells in an optimum temperature range when it's -5C outside.

...

Let's also bear in mind that Fogstar supply more than one solution. They certainly do have an IP rated and heated battery solution that, half populated for 20kWh is £4,000 and fully populated to 40kWh is £7,000.

Fogstar Energy 51.2V 40.96kWh IP56 Outdoor Battery System and Cabinet

I'm certainly not providing any recommendations but it does allow for once again comparing like with like.

 


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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