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Our son bought the 70 watter for his Scamp
13, we have 80 watts. They used to show a 70 watter on this page. I believe if you want a 70 watt unit they will make it. The 80 fits just fine on our Scamp
We have bought three different controllers. I have the simplest solar
controller, a fancier mmpt controller and a really fancy pwm controller that allows you to preset all kinds of thing and actually see the number of amp-hrs added to your battery
. We installed the latter in our son's unit.
This was the fanciest of the bunch. It really does all kinds of things, like shut off the battery
load when the battery
gets low and you can preset the level...and so on. about $45
This is the simplest and costs about $10. We do not use it to control our load current but to charge and maintain the battery. Works fine for us.
We also have one like this that we are not using right now. A little more efficient battery charging technique. about $20.
MPPT 30A Solar Power Controller Regulator Converter 12V/24V Auto Switch 720W aub | eBay
Hope that helps