I want to add solar battery maintainer to my attitude toy hauler. I intend to hang solar panel in a trailer window, running cables to the battery. The panel would only be connected when in storage. I am currently using two GC2 6 volt batteries connected in series. I would be grateful for any advice or hardware recommendations.

I use a 30 watt panel and $22 weatherproof controller from WindyNation. The panel is roof mounted, however, on top of my RV cover.

https://www.renogy.com/50-watt-12v-monocrystalline-starter-kit/

What is the wattage of the panel? Generally you're better off to disconnect a battery cable and check monthly.

Hi Dan - Have you considered going full steam with your solar? We added 700W of panels to our roof a little over a year ago and it was one of the best upgrades we ever did. We hardly run our generator anymore.If you plan to keep your hauler for a long time, it's a great investment and a HUGE convenience.(4 x 6v batteries)

For those who check their batteries and can recharge in some way, yes, 2oldman. For the majority of RV owners you’d be lucky if they check anything at any time until it doesn’t work or blows out.

Want to add solar battery charger for storage use

Lwiddis
Explorer II
May 21, 2020
I use a 30 watt panel and $22 weatherproof controller from WindyNation. The panel is roof mounted, however, on top of my RV cover.
time2roll
Nomad
May 21, 2020
https://www.renogy.com/50-watt-12v-monocrystalline-starter-kit/
2oldman
Explorer II
May 21, 2020
What is the wattage of the panel? Generally you're better off to disconnect a battery cable and check monthly.
dedmiston
Moderator
May 21, 2020
Hi Dan - Have you considered going full steam with your solar? We added 700W of panels to our roof a little over a year ago and it was one of the best upgrades we ever did. We hardly run our generator anymore.

If you plan to keep your hauler for a long time, it's a great investment and a HUGE convenience.

(4 x 6v batteries)
Lwiddis
Explorer II
May 21, 2020
For those who check their batteries and can recharge in some way, yes, 2oldman. For the majority of RV owners you’d be lucky if they check anything at any time until it doesn’t work or blows out.
jdc1
Explorer II
May 21, 2020
Yep...go big, as dedmiston says. 100-200watts will keep you happy when you're out there in Glamis or Borrego.
pianotuna
Nomad III
May 21, 2020
Putting the panel in a window may reduce the power output a LOT.

Far better to permanently mount on the roof.

For 2 golf cart batteries I'd recommend 140 watts (or more).
Lwiddis
Explorer II
May 22, 2020
But I say “go appropriate” based on an energy survey of what you use (amp hours) or what you would like to use. Throwing money (solar watts) at a problem (need more power) isn’t the answer.
garym114
Explorer II
May 22, 2020
Save your money, charge the batteries fully and disconnect the ground battery cable. Batteries will not lose their charge.
RickLight
Explorer III
May 23, 2020
Last winter I used a 5W panel for 300AH of lead acid. It also powered 2 ultrasonic rodent deterrents. We aren't a major winter sun zone.

You don't need to spend mega bucks!