With the introduction of the widespread availability of solar panels as a power source, there is becoming an increasing need to be able to flexibly charge batteries with a solar input source. Different topologies are needed to meet the requirements of the different input sources and/or batteries. Several battery chargers (together will be referred to as Solar Battery Chargers throughout the remainder of this document) use Maximum Power Point Tracking (MPPT) algorithms to extract the maximum power from a solar panel and to charge a battery. These devices cover a wide range of battery voltages as well as feature different topologies to accommodate these input voltages and charge voltages.