Hi all,
I need help with a circuit so that I can charge two lead acid batteries on my car via the alternator BUT current is only drawn from the main battery which always gives me a fully charged battery on standby.
Being a Newbie I thought of maybe adding diodes between the two batteries but what would prevent the second battery then from overcharging?
To solve this thought of possibly putting a circuit after the first battery and after diode with a relay and some type of voltage sensor to take the second battery out of charging circuit when fully charged.
Ideas and advice as always much appreciated.
Thanks.
Barry.
PS The solution is probably quite easy but I cannot see it!
I need help with a circuit so that I can charge two lead acid batteries on my car via the alternator BUT current is only drawn from the main battery which always gives me a fully charged battery on standby.
Being a Newbie I thought of maybe adding diodes between the two batteries but what would prevent the second battery then from overcharging?
To solve this thought of possibly putting a circuit after the first battery and after diode with a relay and some type of voltage sensor to take the second battery out of charging circuit when fully charged.
Ideas and advice as always much appreciated.
Thanks.
Barry.
PS The solution is probably quite easy but I cannot see it!