Thread: Solar controllers

What size panel are you running with the Victron 100 / 30 ? I'm running a 170w fixed , heard a 75 / 15 was ok.

Originally Posted by Floydo

What size panel are you running with the Victron 100 / 30 ? I'm running a 170w fixed , heard a 75 / 15 was ok.

Again it depends how you set them up.

I’ve got 230w (2x115) running on a 75/15 no issues.
It was running 4x100w prior to that.

And here’s the rub. It produces more on the 230w set up than it did with the 400w.

Better panels they’re Victron now!

Originally Posted by Floydo

What size panel are you running with the Victron 100 / 30 ? I'm running a 170w fixed , heard a 75 / 15 was ok.

Currently running 2x120w, however will more than likely add a 3rd before we roll out the gate, depending on roof rack configuration. We do nudge the 240w at times with current panel.

I have changed my config for the solar blanket by utilizing the unused function on DC-DC. But am now considering leaving the solar blanket home.

Either way having a 100/30 will mean I don’t miss any charge when conditions are perfect. Any changes is low on the list of things on the to do list

75/15 will be fine for a 170w panel.

Seems to many way to do the calculations, depending what you read online.

170w/12v=14a
170w/13v=13a
170w*0.9/12v=12.75a
170w*0.9/13w=11.75a

There is probably a more scientific way……The above calculations is a rough way size a solar regulator

Not even close to how you size it.

Specs will tell you all you need

Does this site help?

Solar Charge Controller Sizing and How to Choose One - Renogy United States

That’s better

Just need to know the specs of panels, and how you plan to configure them.

I initially had 2 in series, then parallel with 2 in series.

These are cheap, but I can't comment on the specs.

Kings MPPT Solar Regulator | 20A Charging | Highly efficient for more power - 4WD Supacentre

Got my 170w Hard Korr panel. Got a Kickass 40w MPPT regulator for a good price. It's a little bigger than I expected. So want be able to mount it next to the battery in the tub. Probably be mounted 1 to 2m from battery. If I run 6 or 8 mm fused cable to the battery that should reduce any voltage drop? About the same distance from panel mounted on roof to regulator. Battery is a 120AH AGM. Thoughts, ideas suggestions.