Choosing the Correct Batteries
Batteries are the most important component of an onboard power system – your safety and pleasure will be enhanced with the selection of the right battery.
Many boats use an automotive style for starting their engine and this is a good choice. Using the same style battery to store energy to operate the appliances is not a good choice, even if the battery is marked “Marine Heavy Duty”. Many boats will use a large quantity of these automotive style/marine heavy duty batteries in parallel to overcome their poor performance. Unfortunately, this worsens the situation.
Unless your need is for a very small energy storage capacity, its best to avoid 12V automotive style batteries. Best practice is to use the taller and heavier duty 6 volt or the individual 2V–3.2V battery cells. There are many good and bad batteries to choose from including: flooded lead acid golf cart style battery, the newer sealed AGM, starved electrolyte, or VRL type batteries. If you’re budget allows, lithium-ion batteries offer the best performance.
Please note that some of the high-tech sealed batteries have very poor performance parameters, especially those used in UPS systems and telecommunications. These batteries are designed for long life without cycling.
There are lithium-ion battery kits on the market supplied without cell equalizers or other electronics to manage individual cell temperatures and voltages – make sure your battery pack incorporate these features. Polar Power is supplying Lithium-ion kits that are monitored and controlled through our BMS.