Hello,
I’m in the process of installing a completely new electrical system for two Mercruiser 4.3 l in an old wooden boat.
During my research I came across the attached sketch. I added the starters and radio to the original sketch.
The 4 Ah battery is only intended to supply elementary functions such as the radio.
Is it a problem that this battery is only 4 Ah compared to the others which are 90 Ah?
No, no problem at all.
They are not parallel. They are completely isolated. If the starter and service are full the full charge current will flow to the 4ah. I don’t know if this will be a problem. If they are the same chemistry you could look at a simple VSR and parallel the 4ah with the 90ah service battery.
Has anyone had any experience with this? I have only used the argo for different chemistry and all are quite large.
Thank you. May I ask one more question.
Can I install a switch (1, 2, 1+2) between the starter and service battery so that the service battery can be used to start in an emergency?
Is it critical if the switch is set to 1+2? Should the batteries then each have a diode in the positive line?
Also no problem, even if you left it in 1+2.
In that situation (1+2) is like you have the two batteries (service + starter) in parallel and also two channels from argofet in parallel.
The 4Ah battery is still isolated through the third channel.
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