This is one of the most important choices you will make when it comes to purchasing a solar generator. Choices include lead-acid/AGM, lithium-ion, and Lithium-Iron Phosphate (LiFePO4) batteries. 1. Lead-acid/AGM batteries are the least expensive option but hold the least amount of useful energy and tend to fail. Comparing your kWh of energy requirements per day with the battery capacity and rated outputwill ultimately decide how many batteries you need. Keep in mind that lead. A unit's portability is an essential factor to consider if you are purchasing a solar generator for your RV, motorhome, camping, fishing, hunting, road parties, or traveling. Heavier (>60lb) models will require handles and wheels. This is an important feature to consider if you hope to increase the battery capacity of your unit at a later time. Some solar generators allow the.