Gel Battery: If you select a Gel battery with higher quality, it means you have to bear a higher cost.
AGM Battery: Further consideration, if you select AGM battery used in your system, the cost will be lower than a Gel battery;
WET battery: You also can select the traditional WET battery, the lack of this kind of WET battery is that you have to maintain the battery periodically, need to compensate the electrolyte liquid periodically, It is impossible to avoid the liquid spilled out when using a WET battery, so, you can consider some WET battery with maintenance free, it will be better than the cap-filled WET battery.
Regarding the capacity of the battery, it depends on the power consumption of the load, in addition, the battery discharge level also affect the battery life; generally, you should not over-discharge the battery under 50% of the capacity level.
