Roll Up Solar Panels / Ogre MPPT Controller
I would LOVE to get 10-12 amperes of 12 volt grade charging for my new group 31 Lifeline. But I have a motor-scooter size toad, that forces me to the roll-up kind of solar panel, and woe is me, the...
Forum Discussion
Phil the controller goes close to the batteries to reduce voltage drop, but this is for the controller to know when to start controlling at its high set-point. You could just increase the voltage set by the amount of drop and come out even on that roughly-- since amps keep changing. For a low amp set-up, voltage drop is less so you could have the controller farther away with little effect.
You still want voltage at the panel to be close to battery voltage, but that is so the panel voltage stays as low as possible. The amps taper along the IV curve as panel voltage increases, so you want to reduce/delay that tapering by keeping voltage drop to a minimum. It doesn't matter where along the battery to panel path the controller is for that.
I don't know why you want mono and MPPT for a small solar set. Poly and PWM has more bang for the buck there. You might want to look into that some more before buying anything.
You still want voltage at the panel to be close to battery voltage, but that is so the panel voltage stays as low as possible. The amps taper along the IV curve as panel voltage increases, so you want to reduce/delay that tapering by keeping voltage drop to a minimum. It doesn't matter where along the battery to panel path the controller is for that.
I don't know why you want mono and MPPT for a small solar set. Poly and PWM has more bang for the buck there. You might want to look into that some more before buying anything.
