This is fine for lead acid batteries unless they are very run down. This varies somewhat depending on.
Lead Acid Battery Working Construction And Charging Discharging
Charging batteries in parallel lead acid. To achieve the criteria for balanced charging you simply need to start one of the charging leads from the opposite direction. Each battery must be in a state where it can be voltage charged. A regulated current raises the terminal voltage until the upper charge voltage limit is reached at which point the current drops due to saturation. The charge time is 1216 hours and up to 3648 hours for large stationary batteries. Sealed lead acid batteries are widely used but charging them can be a complex process as tony morgan explains. In theory it is ok to connect them in parallel with two conditions.
With no resistance to slow this charging process the charged units can overheat as they rapidly drain and the discharged battery can overheat as it attempts to charge at well above its design. Simple constant current constant voltage chargers will do the job for a while but the battery life expectancy quoted by the manufacturer will be greatly reduced by using non intelligent chargers like this. For secondary rechargeable batteries the stronger battery would charge the weaker one draining itself and wasting energy. Very discharged lead acid batteries have to be charged with fixed current until they get to a minimum voltage then they can be voltage charged. If you connect rechargeable batteries in parallel and one is discharged while the others are charged the charged batteries will attempt to charge the discharged battery. In this example each battery will draw current through exactly three interconnecting leads.
Multiply the time anticipated to charge one battery by the total number of batteries. The correct method to charge batteries in parallel balanced charging. Into account that the battery charging voltage is higher than the battery discharging voltage. The lead acid battery uses the constant current constant voltage cccv charge method. For example if charging one battery normally takes three hours and you have five batteries linked in parallel the charging time will be five times three hours or 15 hours. The coulometric charging efficiency of flooded lead acid batteries is typically 70 meaning that you must put 142 amp hours into the battery for every 100 amp hours you get out.
Charging sealed lead acid sla batteries does not seem a particularly difficult process but the hard part in charging an sla battery is maximising the battery life.
Gallery of Charging Batteries In Parallel Lead Acid
