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Just a thought, and idea.
suppose I charge up 10 car batteries during the day from my solar power (grid connected), then using an AC inverter pure sine wave, connected to a separate extension lead NOT connected to the mains supply to power my fridge freezer and TV.
any ideas
 
You need to do some acurate cost calculations first, it may not be economic to do it, unless you're trying to save the Planet single handed.
 
The last time I did some analysis of storage of solar electricity in a typical home (ie mine) I concluded it was not a good investment. Far better to invest in more efficient white goods and heating, for example a condenser or heat pump clothes dryer which use about 50% less energy than vented ones, albeit they do take a little longer to dry. Or a condenser gas boiler with a sterling engine generator run off the exhaust heat. In my opinion Solar PV is best used as it is generated to offset import from the grid.

I would be nervous of a large energy dense battery somewhere in the home. What about using your surplus PV to pre-heat the cold water which goes into your hot water system or is circulated in your wet CH system?
 
Thanks for the replies, the load from a fridge freezer and tv for the night time usage would not be a lot. The FF doesn't need pure AC sine, but the TV well maybe. FF would be on from Sunset to generation of solar, TV, off by midnight at the latest. I was only using car batteries as an example, the principle of the idea was what I was looking for.
 
I'd be tempted to power lighting rather than anything more complicated.
 
Thanks again all,
batteries I can get fairly cheap from a scrap yard. Revising my outlook on what I want to power, it would only be the fridge freezer. Lighting is all LED. LED, TV off very early so again not required. Just the cost of a car 12V to 230 V inverter and a bit of wiring, and of cheap extension lead. to the FF.
 
As said above, you need the 'deep cycle batteries'. They are designed to run to very low voltage and be charged again without impact. Car batteries will be destroyed in a few cycles. 120ah leisure batteries are the babys!
 
Probably never save any money even if sourcing parts cheap, but a fun little project none the less, my uncle has done similar in his garage, had a couple of big leisure batteries already and he got a couple of solar panels very cheap with superficial cosmetic damage and stuck them on the garage flat roof, runs lighting in the garage and a freezer, and a trickle charger for his bike. He does have a device connected that cuts charge to the batteries when they are full.
 

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