Battery and inverter in garage

[lakelandfolk]

We have solar PV and Solax battery storage in the house. We want to increase our storage but Solax no longer make the battery that we have ie 6.3kwh Gen 2 triple power. Our garage has a CU fed from the house via a 2.5mm cable. Could we fit a 5.8 battery and inverter in the garage, connected via an RBCO in the CU? The plan would be to charge this extra battery from our Octopus Go off peak.  Would the extra battery automatically feed into the house load or EV charging when required?  I have chance of a very good deal on a Solax 5.8kwh battery and 5kwh inverter.

 

Kind Regards,

Ian

[Dillsue]

Cant say how your inverters/batteries would interact, but Id be fairly sure you'd need to beef up your 2.5mm cable to 6 or 10mm if you want to be able to push 5kw into the house.

[billt]

2.5mm is perfectly adequate for 5kW if the distance is reasonably short, unless it's hidden in lots of insulation.

[SteamyTea]

Run the details though here.

https://www.tlc-direct.co.uk/Technical/Charts/VoltageDrop.html

 

 

[Dillsue]

8 hours ago, billt said:

2.5mm is perfectly adequate for 5kW if the distance is reasonably short, unless it's hidden in lots of insulation.

Maybe from a current perspective, but voltage rise could be an issue for the garage inverter. From a previous post the OP already has a 6.3kw PV system on the house pushing the voltage up. The new 5kw inverter is at the end of a circa 30m cable so theres going to be a bit of a rise on top of a house voltage that may already be elevated on a sunny day.

OPs spark probably needs to be looking at the install detail and design