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If you use 1000 kwh in a month what size solar panel system do you need?
Wiki User
∙ 13y ago
It depends on where you live. You want to know how much Sun you get (solar hours). If you live in Southern California or Arizona, you might get 6 hours per day. If you live in Northern CA or Oregon, it might be closer to 4.
First, you take your 1,000 kWh/mo and divide that by 30 to get your kWh/day.
1,000 / 30 = 33.3 kWh/day
Then you divide this by the number of solar hours per day your area gets. Let's say 5.
33.3 / 5 = 6.67 kW
Last you need to adjust for real world inefficiencies. A good rule of thumb is to suppose approximately 75% - 80% inefficiencies. So increase your system a little.
6.67 kW / 0.75 = 8.9 kW.
This is a fairly large residential system, but you can reasonably expect it to cover 100% of your electricity needs if you use 1,000 kWh per month.
Want to know how much an 8.9 kW solar system might cost? Go to and play the solar calculator in the related link below. (Yes, it's free.)
Wiki User
∙ 13y ago
Wiki User
∙ 11y ago1000 kWh per month would be 33 kWh per day, or 5.5 kW assuming 6 hours of sunlight in the day. A standard 1.6 square metre panel produces 220 Watts, so round about 25 panels would do it, given a sunny climate.
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