I have listed the basic parts you will need for a complete 100 watt solar system.
For this example i have listed a 12 volt 50 amp hour AGM lead acid battery, but choose one that will meet your own needs / budget.
If you can afford a Lifepo4 battery get one as it will last a very long time & will provide a full 50 amp hours.
The lead acid can only give 50% of its rating, so 25 amp hours.
Also remember a 12v 100 watt solar panel cannot charge a 24 volt system and it would struggle to fully charge a larger amp hour battery in a single day.
The inverter is 400 watts which will power most Tv's etc. If in doubt check the wattage rating of the item you want to power & buy an inverter rated to meet your demands.
Solar cables are needed to connect the solar charge controller, solar panel & battery. Always connect the battery to the charge controller before connecting the solar panel!
Everything bought individually would cost under £240.00 (prices are subject to changes)
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These are affiliate links which means i may receive a commission if you buy anything
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12 volt 50Ah AGM lead Acid Battery (25Ah Useable) cheap solar system 100w solar system cheap solar panels
10 Amp Solar Charge Controller, less than $10.00 cheap solar system
3 Meter / 10 feet 4mm solar cables with connectors
4 USB ports, one UK socket outlet and suitable for powering items under 400 watts such as a TV, Laptops, Phones cheap solar system
Not all Inverters will come with cables, if you purchase such an inverter, you will need cables to connect the battery to your inverter. 100w solar system cheap solar system cheap solar panels