Follow up Solar Question

[Katdaddy]

I bought a 130 watt solar suitcase lase year for our trips to the mountains, where we have no hookups. It came with a cheap PWM charge controller and alligator clips to connect to the batteries. Used it on our Fall trip and it worked great. On a previous question someone recommended upgrading to a better charge controller and mounting it inside the camper, which I am in the process of doing. In researching the install I have watched countless how to videos. With the suitcase as it stands I just hook the alligator clips to the battery and go. All of the how to videos say I need breakers and shut off switches and fuses. So, what is different between the two? I don't have a lot of space in my battery compartment to mount all of the devices that I see recommended. What do I really NEED? As always all help appreciated.

[Lwiddis]

I use this controller for my 30 watt panel when the TT is in storage. Three years of good service.

[Lwiddis]

WindyNation sells a weatherproof four stage PWM controler for $25. Buy one of those and mount it to the back of the panel...or close.

[ndrorder]

To have what you have now with noticeable more performance, just install the MPPT controller on the panel frames like the PWM. Easy peasy.

If you want to squeeze every last amp out of the system, connect the charge controller inside the RV near the batteries or the disconnect solenoid depending where you plan to tie into the RV system. Connect to the RV system with a 20 amp fuse in the positive connection. Connect a 20 amp fuse to the input of the controller from the panels with a standard connector such as the Anderson plugs or I prefer the SAE plugs. Buy new larger and longer wire (old wire was sized to carry less power) to run to the panels with the appropriate panel connections. All this, and you may reap the benefit of an extra half amp or so depending on the wire connected to the panels now.

[sgfrye]

mr_andyj wrote:
Your solar panel probably puts out 18.x volts and the controller will drop that to around 13.x volts for the battery. 18 volts travels down wire more efficiently than 13 volts, so you want the controller as close to the batter as possible , within a foot or two.
I would mount the controller near the battery and use the clips to clip to something that leads to the controller.
Better yet, buy some "Anderson Plugs" and use those instead of clips.
PWM is fine for this small of a system. I prefer an MPPT controller, but both will do the job.

But honestly, your wire is probably so short to begin with that mounting the controller at the panel will be almost the same thing.

good advice here, especially anderson plugs

[mr_andyj]

Your solar panel probably puts out 18.x volts and the controller will drop that to around 13.x volts for the battery. 18 volts travels down wire more efficiently than 13 volts, so you want the controller as close to the batter as possible , within a foot or two.
I would mount the controller near the battery and use the clips to clip to something that leads to the controller.
Better yet, buy some "Anderson Plugs" and use those instead of clips.
PWM is fine for this small of a system. I prefer an MPPT controller, but both will do the job.

But honestly, your wire is probably so short to begin with that mounting the controller at the panel will be almost the same thing.

[Yosemite_Sam1]

I've permanently installed my controller at the back on that aluminum ribs of the solar panel.

That's the address the problem of the connections keep on getting detached because the clips on the controller pressing down to lock in the wirings are too flimsy. Works like a charm now and shorten the time to set up and relocate to catch the sun for my solar panels.

[2oldman]

For 130w I wouldn't bother with any of that.