Battery storage and PV

[JohnMo]

First day with no imported energy. Good solar day yesterday and battery starting to earn it space in the home.

 

So no battery charging required overnight, the battery ran down to 54% before PV started to charge this morning.

 

Snap shot from home assistant Energy page, showing current status

 

 

A further shot from the GivEnergy page in home assistant, shows current generation (cloudy), target charge point (overnight on E7) and current battery charge status.

 

 

 

[Russdl]

It’s ace isn’t it.
 

We imported just under 27kWh in April the solar and battery combo sorted the rest.
 

It seems like a good chunk of that import was the constant too-fro of energy between the grid and the battery. 
 

 

 

 

[JohnMo]

3 minutes ago, Russdl said:

imported just under 27kWh in April

 

That's good, we have had so much rain in April the solar has been pretty rubbish. Plus the heating stayed on a lot longer this year.

[Russdl]

I was a looking forward to importing nothing in May but we’re off to a bad start just under 25kWh already, the sun has bid farewell for a few days. 

[JohnMo]

59 minutes ago, Russdl said:

I was a looking forward to importing nothing in May but we’re off to a bad start just under 25kWh already, the sun has bid farewell for a few days. 

Solar is a fickle thing.

[Alexphd1]

@JohnMo what spec is your PV/battery ?

[JohnMo]

PV is two arrays, 3.1kW and 3.6kW. battery is a GivEnergy All in one 13.5kW.

[JohnMo]

Just found I can generate weekly, monthly and annual reports from the battery/inverter.

 

This week has been cloud, rain and occasional sun, so not really the best for solar.

 

But:

House consumed, 124.69kWh of electricity 

Generated from PV, 125.31kWh

PV self consumption is recorded as 92% (however with water heating closer to 100%)

Exported (really went to hot water immersion diverter) 6.73kWh

Imported around 6.5kWh

Current cost for electric £3.70 plus standing charges (E7).

On normal rate electricity £31 plus SC, if I had no battery or PV.

 

So some cost savings, compares battery, PV and E7 to normal electric and no PV or battery.

 

Oct 23 £30 (not on E7 otherwise savings of around £80)

Nov 23 £40 (part month on E7)

Dec 23 £50

Jan £60

Feb £80

Mar £120

Apr £125

May £110

June - Sept about £100 to £120 per month.

 

So annual saving around £1000+ expected. Would expect around 10 year pay back based on cost to install. With no paid export.