Im thinking of buying a 1kw PV for the house. does anyone know (generally) how much these produce? is it upto 1kw per hour? or per Day.
someone i know says its 1 kw per day. that doesnt seem very useful in reducing power consumption.
It’s easy to mix the terms "kWh" and "kW" but it can confuse listeners. kW is power. If you expend a certain power, say 2000 watts (= 2kW) for an hour, you’ve spent 2kWh in energy. (You probably understand this; apologies as needed…)
The solar industry around me, 25 miles east of San Francisco, says that a mounted solar panel (which doesn’t track the sun) will get the equivalent of 4.3 hours of sunlight on an average day. I had a company quote a small 1.5 kW system (4 panels I recall) and they wanted $11,000 for it. I understand there are some best-of-all-time rebates right now so the cost ought to be a lot lower than 11k.
So you can expect 4.3 kWh / day. That isn’t much energy. My electric bill showed over 500 kWh for the month and it was so cool this past month that we didn’t need air conditioning – so 500 kWh is a low figure for us (1140 sq ft, single story house, walnut creek, calif).
The posted comment about "tiered electric rates" is worth tracking down. A typical residence around us has a rate starting at 11.5 cents / kWh for the 1st 180 ish kWh, then the rate jumps to 13 cents, then to 22, then to 41 cents. If your setup can put a dent in the 41 cent usage, you may have a winner.
Also ask your power company if the panels don’t qualify you for a tamer electric rate. Around here, having professionally installed panels does qualify you for such a rate. Just having some panels may qualify you for a rate which ends up saving you some money.