I bought the above model in 2015 and like it a lot. It will provide 10 amps (not more) to keep the boat fridge running without depleting the boat batteries.
You can ‘roll your own’ cheaper, but you won’t get the convenience or the microprocessor that makes the system foolproof. I removed the system and re-installed it on the new truck. Credit to Dr. Bob for the find. I’d advise hooking up to the helm bus like I did.
From a Jan 2016 post:
“Installed the TOAD Charger Bob found...works wonderful, tastes great!
http://www.lslproducts.net/ToadChargePage.html
I hooked it up from the truck engine battery to the hitch to a harness wired to the boat helm DC bus (that is a big wire going back to the House battery rather than the 12g speaker twisted copper cable supplied...added a 15A fuse at the helm, 15A circuit breaker included for under the truck hood (2-parallel battery) link. This skips the main boat transom Blue Seas On/Off switches, but that doesn't matter since I'll only use it when trailering). Much cheaper (tho I am the Buy Quality The First Time Guy) and much easier than DIY with the VSR +10A voltage Limiter + 15A circuit Breaker + a microprocessor that Tells You What You Screwed Up with controller Flashing Light Pattern.
The Boat leg runs from inside the protected hitch tube to boat via the windlass chain tube to inside the V berth thru the anchor hatch under the cushions to connect INSIDE the v berth via hard wired connector to the helm +/- bus terminals...all this is outside the elements.
I love it... thanks again Bob, your advice and vast experience is always appreciated...no other Brat offered this great option!
I'll replace the boat link with proper Marine wire after retirement next summer, but 12g twisted copper speaker wire should last longer than that on my boat.”
Now I don’t think I’ll change out the copper wire since it’s not in use while boating.
Cheers!
John