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I bump this up, maybe I had too many questions first. To simplify, what do you think a better and more reliable setup would be: - two identical and non-separated Dual Purpose batteries - a starter and a deep cycle battery linked only for charging. Thanks for answers.

Dear Experts, I would like to have advice on my possible dual battery set up for my expedition Toyota LC HZJ 75. What I expect from the solution - a dual battery system entirely under bonnet where I have around 70 cm of space for batteries. - any of the 2 batteries should start the car if the...

Thanks for both of you. Stefan's stup is really interesting. My calculation gave me 40-60 Ah a day, but maybe my estimation is too conservative. I now move to the proper section and re-post my questions based on what I learnt from your advices.

One more thing. This would of course need an automatic battery disconnect to prevent both batteries to discharge beyond what is necessary for starting. For example: http://www.batterybrain.co.uk/productspage.php Is there any product recommended to use with Dual AGMs?

Indeed, the point on having two identical batteries is taken. The reason why I have not considered two Deep Cycle batteries is that I understood regular use for starting does not make them any good. I have to say this is so counterintuitive that to Dual purpose batteries would give me more peace...

Thanks, I had no doubts about it! Now the question is whether I can limit my consumption to work it out with a single 105 Ah. Having the solar+alternator during the day, I am somewhat optimist.

Thanks for the creative idea, but it would still leave me without starting in case one of the batteries dies. What if I take a starter as first battery. As second battery I will have a deep cycle as you proposed and an antigravity microstart to help it start the car, would it be sufficient? It...

Dear Diplo, Thank you very much for your comprehensive response which gave me enough material to learn more on this, which I clearly need. To be honest I am somewhat puzzled because it seems that there is no simple (and relatively cheap) solution for my problem, even with compromises. Having a...

Dear All, I would like to have advice on my possible dual battery set up for my expedition HZJ 75. I will not prepare the system myself but I would like to understand it well for possible future troubleshooting and to be able to choose what would be best for me. Currently I have no experience...