Easy solar calc.

tabbycat · August 2015

Given that the available load demand of a lead acid battery bank is 50% DOD (20 hour rate) or 500 watt-hours per KWH of bank capacity and a 130 watt panel's output is 500 watt-hours per day (Florida annual daily average) then multiplying the WH bank capacity by 0.13 will give you a good estimate of the size of the solar array in watts needed to replace the load consumption.

CALLD · August 2015

Due to the high price of batteries and low price of solar panels I prefer to take the worst month of the year's figures when calculating the size of my array. While this may be more practical for those living at lower latitudes than those living in the extreme north or south it's a safer bet. The weather can be a moody beast sometimes, I'm in the 3rd week now of way below average production and there's still no sign of sunny weather returning any time soon. Solar power is not reliable, it is merely supplements your energy needs when the sun-gods decide to smile upon you;)

cupcake · August 2015

CALLD wrote: »

. Solar power is not reliable, it is merely supplements your energy needs when the sun-gods decide to smile upon you;)

Not exactly true - it depends on WHERE you live. The dry half of the country gets nearly 360 days of sun per year, not to mention the other deserts around the world. I live in the desert there's sun every day all day from sun up to sun down... A key of using solar power is to first go somewhere that has solar in the sky and not clouds in the sky... I am on solar year round, it is not 'supplematary' it is 'primary' for me and others out here...

fyi examples in the USA include, so-cal, vegas, utah, mojave desert, etc

CALLD · August 2015

cupcake wrote: »

Not exactly true - it depends on WHERE you live. The dry half of the country gets nearly 360 days of sun per year, not to mention the other deserts around the world. I live in the desert there's sun every day all day from sun up to sun down... A key of using solar power is to first go somewhere that has solar in the sky and not clouds in the sky... I am on solar year round, it is not 'supplematary' it is 'primary' for me and others out here...

fyi examples in the USA include, so-cal, vegas, utah, mojave desert, etc

Well aren't you the lucky one:)

Where I live partly cloudy weather prevails, sunny weather stretches of more than 3 consecutive days typically comes once a month and overcast stretches of more than 3 consecutive days also typically happens once a month. The best we ever get is maybe a week of mostly sunny weather. The worst stretch I've experienced so far is 3 weeks of persistently unstable weather dominated by overcast skies or mostly cloudy skies. And South Africa is rated as a "sunny" country by world standards...

cupcake · August 2015

CALLD wrote: »

Well aren't you the lucky one:)

Where I live partly cloudy weather prevails, sunny weather stretches of more than 3 consecutive days typically comes once a month and overcast stretches of more than 3 consecutive days also typically happens once a month. The best we ever get is maybe a week of mostly sunny weather. The worst stretch I've experienced so far is 3 weeks of persistently unstable weather dominated by overcast skies or mostly cloudy skies. And South Africa is rated as a "sunny" country by world standards...

You are in South Africa?

Easy solar calc.

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