Hooking Solar to Dual Batteries?

Denny16

@Jax0913 from what Victron and Renogy recommend, you should have a fuse between the solar panels and the MPPT controller and another fuse between the controller and battery.  I have 200 watt panels setups, so I used 30-amp fuses.  Thst said, I am thinking of replacing the fuses with some marine 12VDC circuit breakers that I have from a boat project. 
cheers

AnOldUR

Denny16 said:

... from what Victron and Renogy recommend, you should have a fuse between the solar panels and the MPPT controller and another fuse between the controller and battery ...

I have (but will be returning) a Renogy 100W Suitcase with a controller onboard. There is no fuse between the panels and the controller, but they do have a fuse at the battery connection. On the other hand, there is a fuse between the panels on my T@B and the Victron controller, and another fuse between the Victron controller and the battery. This along with a 20amp fuse is built into the Victron controller. I don't see this on-board fuse on the Renogy Voyager controller.

So, which is correct? Is the T@B / Victron installation overkill or does Renogy fail to meet fusing requirements?

edit to also ask:
If I add a second battery in parallel by running 8awg between the two batteries, do I need a fuse between them?

RMo

To your second question, you do not need a second fuse between the batteries, only on the positive lead from the controller.

As to the Renogy set up, I can only assume that their experts know what they are doing, and I haven’t seen any complaints or reports of issues.

Jax0913

I ended up putting fuses between both positives from the batteries to my controllers. Thanks for the help!