hello friends,
got a small problem.please help me out of this.i have a 200a 12v car battery which was kept in my store for about 4 month.after 4 month,i checked the voltage,i was around 6.6v.i immediately connected my small wind turbine9(ametek 38vdc) to it in trying to raise the voltage.after 2 days of charging,the voltage reached 11.8v which is i think is normal.i have a small switch where i used to charge a primary battery and a secondary battery with my turbine
everyday,i use my turbine to charge both the primary and secondary battery.but some days before i noticed that in 6 hours,there was a drop in that car battery voltage from 11.8v to 10.1v.i thought that maybe some more charging was required but even if my with turbine is hooked to it for 2 days,the voltage drops to 10.1 volts.i have checked if the switch was defective thus connecting both batteries,but the switch is fine.i have been using this system for 2 month but there was no such problem
and also,i have never used the battery before.
is there a solution to solve the problem please?thx