No longer does a hydration system need to be externally charged every night.
The Del Sol from WissTech contains a lithium ion battery (with a life expectancy of 7 years) that is charged by the sun. Just take the machine outside, and let the solar panel charge and maintain the battery while it is in use. The solar panel is so efficient, it even charges on cloudy days.
No external battery charger is needed to charge/maintain the lithium ion battery powering the Del Sol 20. The charging can be completed in as little as six hours.
Standard Features for the Del Sol include: Sliding, retractable solar panel charger; 14Ah lithium ion battery (7 year life*); LED battery meter; Run dry pump shut-off timer; Water filter w/replaceable cartridge; 20 gallon insulated tank; No flat tires; Sealed wheel bearings; 6 bend water nozzles; Quick disconnect complete drain; and Optional school/team graphic wrap.
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