calculate solar panel and battery storage

If planning to install solar street lights at your home, you need to consider the amount of solar panel capacity and battery storage you require. This is necessary so as to use the solar energy tapped by your solar panels and stored in the form of electricity in your battery in an efficient and proper manner for fulfilling your lighting needs. While planning over this, consider the days when there will be no sun or when it appears for a much less time due to clouds and other undesired weather conditions.

For calculating solar panel and battery storage on the basis of rainy days, you will have to make some assumptions. Firstly assume the amount of load you want to run, the number of hours the load will run in a day and the average number of hours when sun peaks. You will have to size the system large enough, so it can handle a limited number of rainy days with the use of lead acid batteries.

Firstly calculate the watt hours to be used on the basis of your load. Based on watt hours and the type of battery you use, find out the number of amp hours required for rainy days. While doing so, consider discharging battery to 50% to save it from getting worn out fast. This would require doubling your amp hours. It will give you an idea how big battery you need. Similarly you can find out the size of solar panel required. While doing such calculations, you also need to consider the charging system’s efficiency which is not 100% efficient in real conditions, assume 20% losses in it. If unable to perform these calculations yourself, take help of a reliable and accurate web based solar calculator.

Rather than calculating solar panel and battery storage needs yourself, you better approach representative of a popular company manufacturing quality solar energy street lights for a realistic calculation.