A good article from HomePower:
For decades, lead-acid battery technology has been the mainstay of battery-based renewable energy systems, providing reliable storage and ample energy capacity. The most common battery used—flooded lead-acid (FLA)—requires regular watering to maintain electrolyte levels and venting to avoid the buildup of hydrogen and sulfuric gases. Additionally, FLAs are large and heavy, making battery replacement a challenging task for some systems.
With all of the recent action in the electric vehicle and personal electronics industries, lithium-ion (Li-ion) batteries have gained much attention. Here, we examine Li-ion battery pros and cons, and discover why most system owners won’t be swapping out their FLA batteries anytime soon.
Link to a BMS (battery management system) addresses issues described in article…
Link to Solar Liberator Indiegogo R&D effort. Invest $799 for a 500 watt plug & play appliance with 80 AH of Li-ion battery, available April 2014. Estimated retail price $1,000 or 2/watt
Solar Liberator dramatically reduces the complexity and cost of solar power. With an inverter, smart battery and control electronics packaged into an easy to use appliance, it requires no further setup. Solar Liberator comes in 500W, 100W and 25W variants.