This will give you maximum output amps from the controller. The charge controller reduces overall system maintenance and prolongs the life of your battery. If you don’t want to waste output in heat, size the controller at around two-thirds the rated output of the controller. To determine the output current that the charge controller will have to handle we use the very basic formula for power in Watts: Power = Volts x Amps. A 30 Amp MPPT (Maximum Power Point Tracking) solar charge controller is a solar charge controller embedded with an MPPT algorithm that can handle 30 Amp current to maximize the amount of energy going into the battery from photovoltaic (PV) module.. What is a 30 Amp MPPT Charge Controller. LEDs indicate battery charge status. The Samlex SRV-100-30A Solar Charging Kit comes with a high efficiency 100 Watt solar panel, a 30 Amp charge controller,connecting wires and aluminum mounting brackets and hardware that can be used to secure the solar panel to the roof of your remote structure or vehicle, or any other flat surface. ... (7.89 x 1.25 = 9.86 amp). For example, a 100Ah lead-acid battery will need a 10A to 20A solar charge controller, and a single 150W to 200W solar panel to generate the 10A* charge current needed for the battery to reach the battery adsorption voltage. Protect your 12 volt lead-acid or gel cell battery from overcharging and deep discharging with this 30 amp solar charge controller. The exception to this rule is when using solar panels smaller than 5 Watts. The Sunforce 30-Amp Digital Solar Charge Controller handles up to 450 Watts of power from a 12-volt solar panel. LCD screen displays battery voltage or amperage coming from the solar panel. My controller records total Amp's in over 3 days and total amps coming in every minute of so. Where going by "oldtrack's" calculations my system is capable of just over 31 Amps. The most I've ever seen coming in at anyone time was 22 Amps. MPPT controller gives you Watts In = Watts Out (with just a few % of losses internally) PWM controller gives you a lot more losses (Sunking has the math nailed down) Your panels are 31v @ 8 amps (roughly) for about 248 watts BUT your BATTERY charges at about 14V, at the same 8 amps, so you only get 112 watts into the battery . I've got 530 Watts over 3 Panels (160 + 170 + 200) flat mounted on the roof and use a 30 Amp controller. This solar charge controller or "charge regulator" is capable of handling a solar cell array voltage of 15-25 volts. 20 amps is good for a 30-amp controller; 45 amps is perfect for a 60-amp controller; 65 amps is about right for an 80-amp controller Note that the example numbers listed above are simply the “ratings” (the max that a given charge controller can do). In this case, a 10 amp charge controller would be recommended. MPPT charge controllers are rated by the output amperage that they can handle, not the input current from the solar module array. In all Solar Power Systems that employ Charging Batteries, MPPT Charge Controller … 2 x 100 watt solar panels in series = 200 watts / 12 VDC battery bank + 25% = 21 amps. Maximum Power Boost Technology Our 30 Amp Digital Solar Controller features Maximum Power Boost Technology (MPBT). 1 x 100 watt solar panel / 12 VDC battery bank + 25% = 10 amps. 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