On-grid domestic battery storage

markin

Solarchaser wrote: »

Yeah I agree, its entirely about usage.

Something like an ashp is useless to me, as the wife enjoys opening a window in every room every day.... and then putting the central heating on:eek:

You are in the lucky position of living alone and so can dictate what will happen day to day and prioritise using most of the leccy on a bright day.

I can plan... but the wife does what the wife does.
It's not unusual for her to put a load in the washing machine, another in the tumble dryer, start the dishwasher and then go for a shower.:o

I'm also away fairly often with work, so I need the system to be as automated as possible.

I'm toying with the idea of the thermal store with motorised valves to isolate it with minimum temperature, but when temperature is high enough, to stop the combi boiler for hit water, this way the winter is exactly the same as now, but I'd assume my summer hot water needs would be covered.

I just need to work out how to do it.... cheaply

In a perfect world she would be fine with a heat exchanger bringing in warm fresh air, but its not, she would still open the windows

ASavvyBuyer

Zarch wrote: »

You're right.

Apologies, selfishly thinking here as it would be the wife's car ans she only works part time and makes short journeys....... so plenty of opportunity to have it charging in the day via PV.

Also, the EV could charge up during the night when on cheap rate electric (like Octopus Go 5p/kWh for 4 hours) and then discharge to the grid during the evening peak rate at 10p+/kWh (according to the rates published for Octopus Agile export).

markin

1961Nick wrote: »

I've recently changed our TD to a heat pump model. It seems to be using a lot less energy than the previous one & the utility room isn't getting as hot which should further improve it's efficiency.

I Keep reading this "Heat Pump tumble dryer" I thought people were just confused, or maybe its just me!, It seems the exact same system as a Condenser dryer to me, And that has been available for at least 15-20 years... At what point did they decide to re-brand it? :huh:


According to the beko site It was possibly the germans 13 years ago.

zeupater

markin wrote: »

I Keep reading this "Heat Pump tumble dryer" I thought people were just confused, or maybe its just me!, It seems the exact same system as a Condenser dryer to me, And that has been available for at least 15-20 years... At what point did they decide to re-brand it? :huh:


According to the beko site It was possibly the germans 13 years ago.

Hi

Effectively there's a small heap pump in which the evaporator circuit (cold) creates a humidity condensing surface which is much colder than that in a standard condenser dryer (usually operating at cold water supply temperature) with the condensing circuit (hot) providing (some or all of) the warm air to the load for drying the laundry as opposed to relying on resistance elements ... this results in better use of resources as the HP is performing both functions more efficiently (heat at COP>1 and better formation of condensation on colder surface) ...

HTH
Z

markin

I must not have been looking to miss that development.



But a quick look says they would save £33 a year. So certainly no point up grading if its in working order, with a cheap model at £340 taking 10 years to pay back.. if it last that long, and the £600+ models taking 20 years.


Or as you are getting heat in the house on cold and damp days you are also saving on the gas, so possibly saving of only £15??

Piddles

If you drive to work in an electric car and have solar PVs at home then you would have to work the night shift so your car can charge-up at home whilst the sun is shining. In this ideal world the battery in your electric car could also supply power to the house when the car is plugged-in at home.

Businesses are included in the new Smart Export Guarantee scheme from 1st Jan 2020. AND employers can provide employees with tax free charging of their EV at work. Really. No benefit in kind liability (I'd provide the HMRC link but I'm not worthy yet....).

So....employer puts PVs on his roof under the scheme and, assuming the employee has a shortish commute and a largish EV battery, they charge up while the sun shines at work, drive home, power their house from their EV battery after sunset leaving just enough juice to get back to work the next day....

An excellent tax free perk.

Except I work mostly from home :rotfl:

1961Nick

Piddles wrote: »

Businesses are included in the new Smart Export Guarantee scheme from 1st Jan 2020. AND employers can provide employees with tax free charging of their EV at work. Really. No benefit in kind liability (I'd provide the HMRC link but I'm not worthy yet....).

So....employer puts PVs on his roof under the scheme and, assuming the employee has a shortish commute and a largish EV battery, they charge up while the sun shines at work, drive home, power their house from their EV battery after sunset leaving just enough juice to get back to work the next day....

An excellent tax free perk.

Except I work mostly from home :rotfl:

I only noticed this week that the BIK rate for an EV drops to 2% in 2020/21.....that's a game changer.

Piddles

I only noticed this week that the BIK rate for an EV drops to 2% in 2020/21.....that's a game changer.

Goodness... that's HUGE.

The amount of tax the employee pays for a Nissan Leaf 40kWh goes from roughly £1,004 down to £128 for a 20% tax payer (or £1,661 to £255 for 40% tax payer).

Boss, how about a Tesla?

1961Nick

Piddles wrote: »

Goodness... that's HUGE.

The amount of tax the employee pays for a Nissan Leaf 40kWh goes from roughly £1,004 down to £128 for a 20% tax payer (or £1,661 to £255 for 40% tax payer).

Boss, how about a Tesla?

It's taken the Model 3 to the top of my list by some margin... & the timing is just about perfect too.

It's a more expensive car than I have now, but would easily save me £7K a year.

Piddles

You'd better get your order in early. Everyone is going to want one once this becomes generally known!