This blog post provides a brief description of a 120 Watt Hour Solar Power Pack. This provides a bright LED, USB charge points, and a 12 V lighter socket for a power inverter. The power inverter produces 230V for low-powered appliances.
This power pack uses a 20 Ah sealed Lead Acid battery which can deliver 120 Watt hours of energy. This could for example charge a mobile phone 9 times or keep a couple of 5-watt LED lights on continuously for 12 hours. Using the power inverter, this power pack can run a laptop charger for 3 to 4 hours.
This solar power pack is ideally used with a 50-watt solar panel, which would take around 6 hours to charge it up. This would take typically 2 to 3 winter days or 1 to 2 summer days.
Solar Power Pack - How to connect the devices together
Here are some photos of the Power Pack.
Components.
Connector for solar panel
20 Ah 12 V sealed lead acid battery
Solar Charge Controller (good for up to 100 Watt solar panel)
Bright LED
300 W Power Inverter - plugging into 12 V cigarette lighter socket
Close-up of wiring: Battery to connector block through a 20 Amp fuse. 12 V cigarette lighter socket also to connector block. Wires from connector block to Solar Charge Controller (SCC). Wires go from the connector block to the SCC. You can also see the wires to the Solar Panel and the LED light in the picture.
12 V Socket
This adapter allows 12 V devices such as power inverters and cool boxes to be plugged in.
This adapter allows 12 V devices such as power inverters and cool boxes to be plugged in.
12V Cigarette Lighter Socket (About £6)
Power Inverters
Up to now we have looked at devices that work at 12 V. There are many appliances that use 12 V as this is required in caravans. Examples are lights, cool boxes and fridges. But sometimes one needs to supply 230 V to appliances with a mains plug. A Power Inverter steps up the 12 V from a battery up to 230 V for this purpose. Note that a 7 Ah battery will not power 230 V appliances for very long and you might to fit a larger capacity battery.
Up to now we have looked at devices that work at 12 V. There are many appliances that use 12 V as this is required in caravans. Examples are lights, cool boxes and fridges. But sometimes one needs to supply 230 V to appliances with a mains plug. A Power Inverter steps up the 12 V from a battery up to 230 V for this purpose. Note that a 7 Ah battery will not power 230 V appliances for very long and you might to fit a larger capacity battery.
12 V 300W Pure Sine Wave Power Inverter (About £32)
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