Solar storage review

Awaiting approval
Victron can power critical AC loads on their own circuit
Works only on a single PV string
Inverter charger must be larger than PV size
Need an external relay to make it comply, costing about £1,000
Only works with single inverter so max PV depends on existing inverters
Can add an additional 6.4kWh battery bank
Can add multiples of batteries sizes available
The Moixa battery system has DC outputs to connect LED lights as backup lighting in event of power cuts

4kW+ PV system

Tesla Powerwall + SolarEdge

6.4kWh of capacity ideally suited to 4kW of PV.
Expected longer battery life due to liquid and air cooling
Simple design
3.6kW of continuous power to run immersion heater and kettles which are typically 3kW
10 year warranty on battery

Darfon + Growatt

Wait for Tesla Powerwall 2

The 14kWh Tesla Powerwall 2 is more suited to charging the large electric car batteries of 30kWh+.
The existing Tesla Powerwall 6.4kWh model will continues to be manufactured to cost effectively meet the demands of most UK households.

Wait for Tesla to release backup system

The Tesla Powerwall system can be installed as a backup system in many other countries and Tesla are hoping an agreement can be reached with the Distribution Network Operators to make it easy in the UK.

The expected savings for the average 3 bedroom home is £344 per year

Assumption	Unit	Value
Energy from PV system	kWh	4,328
Current use of PV in home		35%
Use of PV in home with battery		85%
Units of energy saved	kWh	2,164
Financial benefit of energy saved	£	344