solar panel wattage
To visualize the size of your solar system, must ensure that in a period of time (taking into account the seasons and the mild climate and conditions light), production of solar panels at least as much energy as their cargo (laptop, TV, lights, etc.) consume.
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In the UK, northern Europe and North America, a conservative estimate allows four hours of full sun in summer and winter time.
The energy produced by a solar panel at a time is your power (watts).
The estimated power produced in a day by the group is obtained by multiplying the energy produced in one hour by the number of peak sun hours.
Thus, in the UK, a 30W panel will produce about 120 watt-hours (30W x 4 hours) of power on an average day in summer.
1. Estimating the total energy use (W) of their devices
List of all appliances intended 12V power from your solar system and discover how many watts consumed by each one (for the device, or power adapter manual).
2. Calculate your total Watt-hour daily requirement
Estimate how many hours each appliance will use every day. Multiply each unit of power by the use of your estimated time daily "to calculate the daily requirement of watt hour to set. Add up the watts per day of hours requirements of all devices to determine your total daily requirement Watt time.
3. Calculate your solar panel size
Take the Watt-hour daily total requirement estimated at 3, and divide by the number of hours of usable light you expect in a normal day (for example, four hours in summer and winter time for the United Kingdom, Northern Europe and North America). This will give the minimum power its solar panel.
4. Calculate your size battery
Battery capacity is measured in ampere-hours (AHRS). To calculate how big of a battery that you needed, take the total daily watt hour requirement estimated at 3 and divide by the battery voltage (12V or 24V) to convert back to ampere-hour.
You should not discharge a battery beyond mid-level, so we then multiply this figure by two to get the battery size correct.
The calculation so far assumes that the battery is recharged daily. If you want to be the autonomous power of n days (ie, only energy solar charge the battery every day n), multiply that figure by n to give the final battery size.
5. Worked Example
You want to run a 30W for laptop 2 hours a day and a 10 W light for 4 hours a day. The daily requirement watts when the laptop is 30 x 2 = 60 watt-hours. The requirement Watt hours of light is 10 x 4 = 40 watt hours. Thus, the total daily watt hour requirement is 60 + 40 = 100 watt-hours. You will use the system during the summer in a place which offers 4 hours of sunlight daily. Thus, the panel must have power of at least 100 / 4 = 25W.
Its 12V battery should be able to power your laptop and light for five days between charges. Thus, the size of your battery needs to be at least (25/12) x 2 x 5 = 20.83 AHRS.
