Tesla shipped Powerwall batteries to Puerto Rico last fall -- and to Australia last December -- and now it's helping Hawaii. Again. Specifically, it supplied equipment to the island state to help schools combat Hawaii's tropical temperature and relative humidity. Roadshow reports that Tesla shipped some 300 batteries and solar panels to the island as a way of keeping schools cool using renewable energy. This was after state government challenged the local department of education to cool an additional 1,000 classrooms without bumping electricity usage.