One charger for multiple batteries ?

[CompoSimmonite]

I have a number of batteries, mainly traction types, that I keep fully charged. This involves using a voltage sensing charger and swopping it over to the next battery after a day - and so on. They are all different capacities from motorbike to leisure with car and traction in between That means they have to be charged separately and diodes or other methods not suitable.
What I'd like is an automatic selector, that I can then attach the charger input and have numerous outputs for each battery, that will change over every day.
Best idea I can think of is a 7 day digital timer, which has internal battery, for each output to the battery but that works out very expensive.
Any suggestions - or do I keep on with the manual change over ?

Cheers.

Paul H

 

[Robotstar5]

Loop the charger output into the switched contacts of multiple relays, then fire each relay coil as it's needed with a mini PLC, Raspberry Pi etc,?

Edit: the output contact on each relay goes to each battery.

 

[knighty]

if they're all lead acid batteries, and you're not actually charging them just keeping them topped up... you can just put them all in parallel and leave one small trickle charger to all of them at once

(as long as the motorbike battery is 12v?)

 

[Gareth J]

You could go for a manual changeover but wire up all your outputs to one, multi-pole switch. Still need to flip the switch round one notch ever day but saves faffibg with croc clips.

Or, just order a bunch of individual, cheap battery tenders and leave them hooked up all the time?

 

[julianf]

I'd say as above - if they all require the same float voltage, just float them all in parallel. If its only float, and not charge, then the smallest of power sources will, I'm sure, suffice (within reason)

Charge elsewhere, and then just add back onto the setup for storage.