Interesting facts about sun-powered devices

user warning: Unknown column 'i18n.language' in 'where clause' query: SELECT DISTINCT b.* FROM blocks b LEFT JOIN blocks_roles r ON b.module = r.module AND b.delta = r.delta LEFT JOIN i18n_blocks i18n ON (b.module = i18n.module AND b.delta = i18n.delta) WHERE (i18n.language ='en' OR i18n.language ='' OR i18n.language IS NULL) AND ( b.theme = 'garland' AND b.status = 1 AND (r.rid IN (1) OR r.rid IS NULL) )ORDER BY b.region, b.weight, b.module in /var/alternc/html/o/orangeseeds/usr/drupal-6/modules/block/block.module on line 456.

This page on Flex Solar Cells website displays very useful tips, rules of thumbs and formulas for sun-powered devices.

It lists a series of calculations to estimate the required solar panels in contexts where you recharge batteries or not. It also makes recommendations as to the required voltage for batteries as well as to the kind of circuits required for charging batteries.