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  • How to Size Your Off-Grid Solar Batteries

    it's what you class as sun, panels still work on cloudy days just not as well. our house uses half a KW per hour with everything in the background so phone chargers, a couple of laptops, routers, fridges, freezers etc.its our first year of grid solar and the hard part is not exporting anything as most is generated during the afternoon but its still worth doing so far, I'd like to add more panels to catch the evening sun as winter time is produces next to nothing so off grid not an option without a second source of power. you can fit switches to go back on grid when your bank goes flat. some have built set ups to use economy 7 to charge a bank at night buts its only effective if you have it already I reckon.the ideal off grid solution is to drive an electric car, charge it at work for fr...see more »it's what you class as sun, panels still work on cloudy days just not as well. our house uses half a KW per hour with everything in the background so phone chargers, a couple of laptops, routers, fridges, freezers etc.its our first year of grid solar and the hard part is not exporting anything as most is generated during the afternoon but its still worth doing so far, I'd like to add more panels to catch the evening sun as winter time is produces next to nothing so off grid not an option without a second source of power. you can fit switches to go back on grid when your bank goes flat. some have built set ups to use economy 7 to charge a bank at night buts its only effective if you have it already I reckon.the ideal off grid solution is to drive an electric car, charge it at work for free then run the house off it at night :)

    years ago I worked out that you could go off grid if you created a massive bank and ran your house like a submarine. that was before solar really kicked in.as I understand it as I am currently tied to the grid then to go off it in event of a zombie plague for example then at its simplest I would need to recreate 240v to power the inverter first so it can then use the power I generate through my 3.5kw array to charge batteries or run appliances. in theory a simple car inverter and battery would do it.one thing I have noticed is that most inverters do not generate power until the panel voltage goes above 150v so you have a chunk of lost voltage going spare on cloudy days which could be run through a battery bank if you set one up as a voltage buffer. there's a lot of spare voltage we brit...see more »years ago I worked out that you could go off grid if you created a massive bank and ran your house like a submarine. that was before solar really kicked in.as I understand it as I am currently tied to the grid then to go off it in event of a zombie plague for example then at its simplest I would need to recreate 240v to power the inverter first so it can then use the power I generate through my 3.5kw array to charge batteries or run appliances. in theory a simple car inverter and battery would do it.one thing I have noticed is that most inverters do not generate power until the panel voltage goes above 150v so you have a chunk of lost voltage going spare on cloudy days which could be run through a battery bank if you set one up as a voltage buffer. there's a lot of spare voltage we brits are unable to use. I did wonder if a US 110v inverter could be set up to use this lost power.

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