MidNite Solar The KID MPPT Solar Charge Controller for Lead-Acid and Lithium Batteries, DC Load Controller with Automatic Genstart
SKU: MNKID-B





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Product Summary
Specifications:
- LCD display plus status-indicating LEDs
- Takes in up to 150Vdc from solar panels
- Battery voltage range: 9V to 64V
- Charges up to 30Adc
- Works with Lithium, lead-acid, and other battery chemistries
- IP50 with conformal coating
- Fits up to 10 AWG cable in PV Input, load, and battery-out terminals
- Certified to UL 1741 and UL 458
- Designed and assembled in the USA
- Weight: 6lbs
- Dimensions (H×W×D): 5×9.25×3.3in

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MidNite's The KID MPPT Solar Charge Controller
MidNite Solar’s American-made products are designed to eliminate common pain points found in energy systems. MidNite’s the KID is a prime example of this MidNite philosophy. It’s a UL 1741 30A charge controller designed for mobile applications, and it’s compatible with many battery chemistries and voltages. Its unique features enable a customizable experience for every user.
A single KID charge controller accepts only one solar panel array. When more power is needed, it’s possible to stack the KID for increased charging capabilities. Systems with multiple KID charge controllers need a six-conductor phone cable for communication between the units, and all KID charge controllers communicate in either Twin Mode or Sync Mode.
In Twin Mode, two KIDs act as one charge controller with up to 60A charging. This is useful when a solar array generates more watts than one KID can output to the battery bank. In Sync Mode, it’s possible to wire up to 12 KIDs in parallel. This is ideal when charging batteries from multiple arrays and the arrays are different sizes.
In solar systems with batteries and a generator, it’s useful to charge the batteries from the generator if weather prevents the solar panels from producing enough power. The KID monitors the battery voltage and automatically starts a connected generator with two-wire AGS (Automatic Genstart).
AGS is included in the initial installation and requires no extra wires or voltage sensing features. The KID runs the generator according to preset minimum and maximum runtimes. If the KID notices that the battery is fully charged before reaching the maximum runtime, it automatically turns off the generator. This enables the batteries to reach full charge even on cloudy days without wasting generator fuel.
When the solar array produces more power than the batteries need, the KID diverts this power to running connected loads. This allows users to get the most out of their array and makes sure the solar system is as efficient as possible. The end user sets the voltages at which power starts and stops being diverted to loads. Other load options are available, and some of them run directly off the battery, as is the case with the Night Light function.
It’s common for mobile energy systems to use a night light. Different charge controllers have different features for measuring daylight, and some of them cannot differentiate between sunrise and a street light. The KID includes settings to adjust for this issue. Settings adjust the KID’s sensitivity to light, which allows it to differentiate between true sunrise and other light sources.
The KID works with MidNite’s Whiz Bang Jr. and a shunt to calculate the battery bank’s SOC% (state of charge). The AUX menu allows users to enter the battery bank’s information so the Whiz Bang Jr. can accurately measure the amps going to the batteries and estimate the remaining time to full charge.
Choose MidNite Solar’s The KID for a solar charge controller designed for mobile applications. Install it in a boat, RV, or off-grid cabin for a reliable, American-made product.
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Frequently Asked Questions
The KID tops out at 30A of charge current, which works out to roughly 420W of panels on a 12V bank, 840W on 24V, and 1,680W on 48V. A modestly larger array is fine, since The KID simply caps its output at 30A in strong sun, as long as the array's cold-weather Voc stays under 150V. Our support team is happy to help with sizing, so contact us with your panel specs.
MidNite's HyperVOC design lets The KID take up to 162V on the PV input without damage. Between 150V and 162V it won't charge, though; it waits in standby until the array voltage drops to 150V or lower. Run your panels through our cold-weather Voc calculator and lay out your strings so the coldest-day Voc stays under 150V, and you won't lose charging time on clear winter mornings.
Select the Lithium battery type in the charging menu, or choose Custom and enter the absorb and float voltages from your battery manufacturer's spec sheet, with equalization turned off. The KID handles 12V, 24V, 36V, and 48V nominal banks.
No. The KID's PV, battery, and load negatives must stay isolated from each other, with each one landing on its own terminal on the controller. Load positive is shared with battery positive internally and loads are switched on the negative side, so run each load's negative to The KID's load negative terminal rather than to a common negative bus. Tying the negatives together outside the controller can cause inaccurate current readings and damage.
Plan on a breaker or disconnect on the PV input and another between The KID and the battery. MidNite's MNEPV 150V DIN-rail breakers and MNEDC panel-mount breakers are the usual match, and a Baby Box enclosure keeps the DIN breakers tidy right next to the controller. Ratings depend on your array's short-circuit current and wire gauge, and our support team is happy to help you pick them, so contact us with your system details.
Not this standard version. The MidNite MNBTS sensor is sold separately and comes standard only on the marine KID. With a BTS installed, The KID automatically adjusts charge voltage to battery temperature, which matters most for lead-acid banks in unheated spaces.
The KID is fanless and operates from -40°F to 122°F (-40°C to 50°C), but it automatically scales back output above 77°F (25°C). Mount it indoors, out of direct sun and away from engine or furnace heat, with open air around it so it stays cool and holds more of its 30A in summer.
MidNite Solar backs The KID with a 5-year manufacturer warranty.
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