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Solar Batteries
The use that solar batteries experience requires them to be slowly charged but be capable of supplying large amount of power for longer periods. Many people substitute standard car batteries, but are disappointed when they fail in a very short time. If you want your appliances to work, run your refrigerator, stay cool and your water to flow, then you need the reliability of good quality deep cycle solar batteries.
The most popular choices of deep cycle batteries include AGM, GEL and lead acid types. Of these the AGM and GEL batteries are maintenance free whereas the lead acid batteries require regular maintenance.
AGM Batteries
The newer type of sealed non-spillable maintenance free valve regulated battery uses 'Absorbed Glass Mats', or AGM separators between the plates. This is a very fine fiber Boron-Silicate glass mat. This type of batteries have all the advantages of gelled, but can take much more abuse. These are also called 'starved electrolyte'. Just like the Gel batteries, the AGM Battery will not leak acid if broken.
GEL Batteries
The GEL battery design is typically a modification of the standard lead acid automotive or marine battery. A gelling agent is added to the electrolyte to reduce movement inside the battery case. Many gel batteries also use one way valves in place of open vents. This helps the normal internal gases to recombine back into water in the battery, reducing gassing. 'Gel Cell' batteries are non-spillable even if they are broken. Gel cells must be charged at a lower voltage (C/20) than flooded or AGM to prevent excess gas from damaging the cells. Fast charging them on a conventional automotive charger may permanently damage a Gel Battery.