Batteries in parallel and fuses. (1 Viewer)

[Two on Tour]

Advice please, I'm fitting a second 110Ah battery (both the same capacity from the same manufacturer) and wiring them in parallel as per the drawing with a fuse at each end of the positive line.

In addition I'm fitting a 1000 watt pure sine wave inverter and a 150 watt solar panel via a Victron BlueSolar 75/15 MPPT regulator. I plan to fit an isolator switch and a 100 amp fuse in the inverter 12 volt positive line and a 15 amp fuse in the solar panel positive line from the regulator to battery.

Now the questions, bearing in mind the normal draw from the habitation side plus the solar and inverter what are the thought regarding the values required for 2 fuses in the positive line joining the batteries and are the values I intend to use in the solar and inverter lines OK ?

 

[Wissel]

The two fuses where you have them do the same job (unless the batteries are a good distance apart)

I'd forget those two and add one where the positive leaves the battery bank.

 

[Two on Tour]

My understanding is that 2 fuses are required in the positive battery link to protect it from any earthing along it's length.
I should have stated that positive line out to the habitation is already protected with a 25 amp fuse fitted by the van manufacture.

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[Allanm]

I use these on the positive terminals on both batteries

http://www.12voltplanet.co.uk/battery-terminal-cube-fuses.html

 

[Wissel]

My understanding is that 2 fuses are required in the positive battery link to protect it from any earthing along it's length.
I should have stated that positive line out to the habitation is already protected with a 25 amp fuse fitted by the van manufacture.

I'd say that's correct if the batteries have some distance between them, but not needed if close together.

This is my battery setup:

I have two batteries under each front seat, so because the wire in the middle is quite long (so could get damaged) I have fuses either end. Where each pair of batteries is joined, I don't.

The figures are my fuse sizes if it helps - would say 100a fuse is about right for a 1000w inverter.

 

[Two on Tour]

I use these on the positive terminals on both batteries

http://www.12voltplanet.co.uk/battery-terminal-cube-fuses.html

They look worth investigating, thanks @Allanm

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[Allanm]

If you have a Victron controller, it might be an idea to get the VE Direct Bluetooth dongle. It will allow you to monitor the batteries and solar input on a smartphone. It also allows you to keep the controller software up to date.

 

[Two on Tour]

If you have a Victron controller, it might be an idea to get the VE Direct Bluetooth dongle. It will allow you to monitor the batteries and solar input on a smartphone. It also allows you to keep the controller software up to date.

Smartphone ? what's one of them then , Na it will be hooked up to a Victron MPPT controller for info on what it's doing.

 

[pappajohn]

1000 watts is 83amps @ 12v so 100amp fuses will leave 17amps for 12v items.
Of course, actual battery voltage will be higher so amperage slightly lower.
100a fuses should be ok.

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