What are my options for a 20kwh+ battery?

[kentar]

I need something that can go outside next to the house. I'm not bothered if it's ground mount or wall mount. Height and width don't matter. The only restriction I have is that i'm limited on depth to 250mm.

 

I've found Fogstar have just come out with a battery that fits the bill but it's on preorder. I'll need 2 of them.

https://www.fogstar.co.uk/collections/server-rack-batteries/products/fogstar-energy-ip-rated-16-1kwh-48v-solar-battery

 

Are there any other options that are immediately available and don't break the bank?

Edited yesterday at 17:17 by kentar

[Nickfromwales]

Seen some wall mounted external Givenergy units recently, seemed to not project too far from the wall, but Tesla prob worth a look too.

 

I guess just googling the dims of various units is your best bet. 

[Nickfromwales]

How long is the wait for Fogstar?

 

You can’t become huge rush, and @jack has one of their units iirc. 

[Andehh]

Also interested to know! 

 

I want the battery in the external garage, but the fuse box and solar inverter is in the utility room. 

 

I have 2 x armoured cables, and 2 x Cat6a, running between the two, originally for car chargers, can these be used to connect the battery to the house? I have no comms cables installed, is this an issue? 

 

Thanks

Edited 20 hours ago by Andehh

[-rick-]

22 minutes ago, Andehh said:

I want the battery in the external garage, but the fuse box and solar inverter is in the utility room. 

 

I have 2 x armoured cables, and 2 x Cat6a, running between the two, originally for car chargers, can these be used to connect the battery to the house? I have no comms cables installed, is this an issue? 

 

No.

 

With a 48V battery you need really thick cables for even a short run as you are looking at ~100A current, it'll get very expensive and inefficient to run long lengths of cable. The batteries should be within a metre or two of the inverter.

 

If you want a long run between the solar inverter and battery, maybe best to look at AC coupled batteries (either that come with their own inverter or install a seperate one for them) or look at the high voltage battery options (though even then I'm not sure how keen you'd find installers to go down that route as it won't be a standard option).

[kentar]

It seems Fogstar offer the best bang for buck. 2x 16kwh batteries comes out to £4k. Thats £125/kwh. I don't think there's anyone else who comes close.

 

I'm trying to get to a point of being cost negative. How much money can I generate from this?

I don't know what my energy usage will be. I'm currently in the process of speccing a ASHP install. I've been told my heat loss is above 10kw, so i'll likely be fitting a 12kw heat pump.

[JohnMo]

1 minute ago, kentar said:

I've been told my heat loss is above 10kw, so i'll likely be fitting a 12kw heat pump.

Don't assume the heat loss is correct check for yourself. I have been told by two companies I needed a 10kW ASHP, will be installing a 4kW on Saturday.

 

Certainly don't install anything bigger than you need as part load performance (average winter day) will suffer.

 

4 minutes ago, kentar said:

How much money can I generate from this?

Do you have PV?

[-rick-]

2 minutes ago, kentar said:

It seems Fogstar offer the best bang for buck. 2x 16kwh batteries comes out to £4k. Thats £125/kwh. I don't think there's anyone else who comes close.

 

They are very competitive. Not sure how many installers use them though so you might have to hunt a bit if relying on someone else to install.

 

2 minutes ago, kentar said:

I'm trying to get to a point of being cost negative. How much money can I generate from this?

I don't know what my energy usage will be. I'm currently in the process of speccing a ASHP install. I've been told my heat loss is above 10kw, so i'll likely be fitting a 12kw heat pump.

 

First step, is look again at the heat loss. Is this building either very big or almost uninsulated? 10kw is very high, but equally this forum is littered with threads from people coming here with specs from an installer of similar and after some proper heat loss calcs they walk away with requirements much much lower.

 

If the heat loss calc is right, rather than spending money on batteries and solar, put it into improving the building.

[jack]

13 hours ago, Nickfromwales said:

You can’t become huge rush, and @jack has one of their units iirc. 

 

Nope, not me. 

 

I do look wistfully at their site every couple months. It's utterly insane how much prices have come down over the last few years.

[-rick-]

20 minutes ago, jack said:

I do look wistfully at their site every couple months. It's utterly insane how much prices have come down over the last few years.

 

Feels like every time I look the prices are lower and the offerings better.

 

Though I read recently that the Chinese government is stepping in to control the market in China in an effort to stop companies competeing each other into the ground. Same as they did for solar. So thats likely to mean prices stabilise where they are/go up a bit barring significant breakthroughs with batteries (sodium-ion maybe?)

[Dillsue]

14 hours ago, kentar said:

It seems Fogstar offer the best bang for buck. 2x 16kwh batteries comes out to £4k. Thats £125/kwh. I don't think there's anyone else who comes close.

 

I'm trying to get to a point of being cost negative. How much money can I generate from this?

I don't know what my energy usage will be.

Fogstar do 15kwh self assembly kits for £1480 so under £3k for 30kwh and showing in stock.

 

How much money you can generate depends on so many things but you'd need to estimate usage and choose a tariff as a start

[JohnMo]

1 minute ago, Dillsue said:

How much money you can generate depends on so many things but you'd need to estimate usage and choose a tariff as a start

And if you have solar, no solar no export payments, unless things have changed in the last 3 months.

[Jenki]

15 hours ago, -rick- said:

If the heat loss calc is right, rather than spending money on batteries and solar, put it into improving the building.

👍This.

[Nickfromwales]

2 hours ago, jack said:

 

Nope, not me. 

 

I do look wistfully at their site every couple months. It's utterly insane how much prices have come down over the last few years.

Ah yes, just reread that post and you mention them, just my poor brain recalled that you had gone for one. 
 

They do seem to be cheap as chips though!