UK Cheap off peak electric

[Bob Geldoff1234]

I am currently on the Octopus Go tariff with 7.5p kwh 12.30am to 4.30am and then 30p kwh during the day.I use this tariff to charge my plugin hybrid very cheaply.
I have an old but usable 80ah car battery,a 150 watt dc to ac inverter and a 10 watt LED lamp.
I have it set up to charge the battery on the cheap rate electric and then use the lamp during the peak rate electric.Am I right in thinking this will save some money?

If this works ok and I can power the lamp for many hours then I might upscale the inverter to a higher output,say 700 watts. I would be able to power most of my office supplies during the evening. Obviously the latter setup wouldn't last as long on the battery but was wondering if it's possible.
I will give this a go and report back in a few days of experiments. I know this is already being done with power walls but they cost thousands and this method costs very little.
What are your thoughts on this with advantages and disadvantages?

 

[brianmoooore]

It would work, but the savings will only be about 25p per day maximum.

 

[littlespark]

How about the other way around and charge the battery during the day with solar?


For those of us with solar, of course.

 

[brianmoooore]

You have a much more suitable battery sitting, unused, in your car for most of the time. Even more so for a full EV.
I've no idea of the current 'state of the art' of this, but if it can easily be done, it would go a long way towards promoting the financial viability of EVs.