When purchasing the solar modules and related hardware you should always deal with a company that can supply references from many legitimate satisfied customers. Secondly, the product should be certified and have the strongest possible warranty and not a lot of tricky legalese. The same goes for the solar inverter.
Third, the installation contractor should be a licensed trained individual with several references.
If your solar electric system is the type that requires solar batteries your choice of batteries is very important. If you want the batteries with the longest life then only purchase batteries with service caps so that they can be properly serviced with deionized water monthly and battery life extenders can be added. When we autopsy batteries that have failed prematurely we almost always find it is because the batteries have run very low or out of water. Make no mistake that by using deionized water only you will greatly extend the life of these very expensive batteries.
We have manufactured an additive product for 27 years that definitely helps to prevent sulfation, extends battery life, and also removes sulfation during subsequent charges. We also sell veryinexpensive water deionizers.
In cases of battery failure due to sulfation we have a record of 70% success rate in restoring sulfated batteries. We also use our product, Battery Chem on electric forklift batteries, electric golf carts, automotive, marine and truck batteries. We cannot repair shorted or broken battery cells. They are replaceable on large commercial batteries.
Our company provides 100% free battery manuals and training videos at www.batterychem.biz . The information that you will find there can double or even triple the life of your expensive solar batteries. We also provide free customer phone support weekdays from 8 AM to 4 PM.