Any schematic to charge both batteries

[guruji]

Anyone know of a schematic to charge both source and charging battery automatic?
Thanks

[FrozenWaterLab]

Yes I just downloaded the Daftman's circuit. Now let me find that link. Be back in a moment.
OK Here is download for circuit layout.
http://www.mediafire.com/?trzuykmylkm

Woh Took me 40 min.s to find this - Make sure you read down the whole thing To Get best circuit.
http://teep.forumco.com/topic~TOPIC_ID~141.asp

He did this in Jan 09 - Don't know if he has updated it or not. Haven't built it yet, but intend to.
Hope the links work. If they don't let me know by E-m and I'll send to you.
FrznWtr

[capthook]

Thanks for posting the links and thanks to Daftman for the design.

Any other similar switching circuits available?

I looked at that circuit in the past and have 2 primary issues:

Quote from Daftman:
"NOTE this circuit only monitors the battery 1. The switchover voltage is set by VR1, lets say VR1 as been set to 12 volts, while the battery remains at 12 volts and above the power to RL1 will remain at 0 volts. When voltage drops below 12 volts RL1 will receive 12 volts this will swap the batteries over, RL1 will only be using currant whilst battery 1 is being charged. When the voltage risers to and above 12volt the circuit will cut the power to RL1 swapping the batteries back."

1. When the voltage on run battery (1) drops below 12 volts it activates the relay, 'switching' the charging battery (2) over to the run battery.  When (1) (now charging) goes above 12 volts, it switches it back to run mode. 
This would create a very short loop?  Meaning it will switch when (1) is at 11.99 volts and then back again when (1) is at 12 volts.  There is no way to adjust the 'cushion'.  Would be better if it switched at 11.99 volts and then back again at say 12.4 volts.
I guess if you had large Amp/Hour batteries it might be feasable....

2. When the (1) battery is switched over/charging, the relay is consuming power.  The relay is only off when (1) is the run battery.  This means excess power consumption by the relay.
A circuit that only requires a brief power input at activation would be loads better.

Would love to see more/better circuits!

P.S.  There is also this from Daftman.  As I haven't seen confirmation of this circuit working or any follow-ups, not sure on how it would perform.

"Now I have given some thought to this and the one thing I can see that may go wrong is the unit going into oscillation. When a full load is on battery 1 and the voltage drops below the pre-set voltage, the power to battery 1 will be disconnected, and swapped all good yes? Not so fast, battery 1’s voltage will rise when the load is switched off it may fool the swapper into thinking that the battery is charged and swap it back again and keep doing that over and over. But on the other hand RL1 will be a small load and may just stop it ever going into oscillation. Dam prototypes."

[capthook]

Another swapper circuit.
This uses a PIC board so is more complicated to implement.

http://peswiki.com/index.php/Directory:Bedini_SG:Replications:Monsieur_Bonheur-SG

and

http://www.youtube.com/watch?v=f2BYQWetmsQ

Any other circuits/solutions anyone can post?

[guruji]

Hi guys anyone have the daftman electronic schematic cause that schematic is with shape design whom I find it a bit difficult to recognize.
I found another schematic anyone has an idea if this is right?