I am well aware of that but the vast majority of residential systems do not have battery storage systems. Staying with the original point, the vast majority of residential solar users are 100% dependent on municipal power. The main reason why someone would go off grid with a battery storage system is that the cost of running municipal power to their remote location was very high and they would have to pay it. Tesla will be more than happy to sell you 6.4 kWh of lithium-ion batteries for $3000 - LOL.
While lithium-ion batteries have numerous advantages over lead-acid batteries, the real advantage of lithium-ion with regard to the speed of charging is if you have a large power source that you can apply. Think of the 120kW Tesla superchargers. For solar applications, the power output is much lower and this isn't really an issue. Regardless, lead-acid batteries only advantage is cost.
Extensive cloud cover will reduce panel output but 75-90%. I used to model solar radiation output reaching the ground for surface energy budgets. Yes, you will still get some small amount of energy but how many typical users will not need municipal power with 75-90% reduction? Certainly they will if the water heater or clothes drier or AC is running. When an AC starts up, it draws considerably more power than when it is running steady-state.
Quote:
Originally Posted by jimbo2012
Well there are two types of solar systems, grid tie
meaning when there's no sun at nite it switches over.
then there's off grid, never using the power company.
The negative of these systems is they require a battery bank which are pricey.
these folks are also looking to Lithium batteries having big advantages there is they charge very quick, last 15-20 years.
I'm building a house in Ga now, going with a grid tie with a 4K system, Ga is buying back my unused. They also bend over backwards to help as in promoting it.
I also have a 600 watt system on my motorhome, I was off grid for 3 months in '14 out west it ran the entire coach except A/C, but didn't need it where we were.
.last point "there is extensive cloud cover you are 100% dependent on municipal power", not correct from everything I've experienced with solar there is almost always gain, perhaps less but more than you would expect.
.
|