Tektrum 30A 12V/24V Solar Panel Charge Controller - 30% Power Boost

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Price: $89.95    

Product Feature

• Under voltage protection Rated Voltage: 12V / 24V ( Auto Switch ); Overload protection (automatic restoration); Short circuit protection (automatic restoration)
• Thunder protection; Reverse discharge protection; Reverse polarity connection protection (automatic restoration)
• Rated Current : 30A; Efficiency: 95% ~ 97%; Open Voltage of Solar Panel : ? 20V (12V battery ) , ? 40V (24V battery ); Over-charging Protection : 13.7V / ( 27.4V )
• Low Voltage Disconnection / LVD: 10.7V / ( 21.4V ); Low Voltage Reconnected / LVR: 12.5 V / ( 25V ); Dimensions: 7.5 x 4.25 x 2 in; Weight : 20 ounces

Product Description

This MPPT 30A 12V/24V Solar Panel Charge Controller Package Includes One (1) MPPT 30A 12V/24V Solar Panel Charge Controller. This 30A MPPT type solar charge controller intelligently regulates the working voltage of solar panels, allows the solar panels always work at Maximum Power Point of V-A curve. Compared with ordinary solar charge controller, this MPPT controller can boost the power of solar panels by up to 30%.

Tektrum 30A 12V/24V Solar Panel Charge Controller - 30% Power Boost Review

This is a $20 standard solar panel charge controller that is being sold as an expensive MPPT ( maximum power point tracking) controller.

An MPPT controller needs 2 additional components beyond what is in a standard charge controller to make it function. It needs a microcomputer to scan and calculate the maximum power point voltage and it needs a high-frequency switching voltage down converting power supply to convert the power at this voltage (about 17 V) down to the voltage that the batteries need (12-13.7 V). Voltage down converting power supplies need a large toroid inductor (transformer) to temporarily store the energy difference so that extra current can be supplied to the batteries at the lower voltage. You can see by looking through the vent holes that this unit does not contain that inductor ( transformer).

The manual although a poor English translation from Chinese states that the MPPT functions only during constant voltage charge (reduced current charge to prevent battery damage) and not during maximum charge. This is insane as the only need for MPPT is during times when the batteries need the maximum current from the solar collectors. In fact it is only under maximum current that MPPT can even function.

When I tested my 8A 17V (MPP) solar collector connected directly to 220AHr batteries with a 50A load on them my amp meter showed 8.4A when battery voltage was 12.4V. When I inserted this supposedly MPPT controller the amp meter varied wildly from 2A to 8A averaging only 6A. During the occasional 1 second time that the amp meter showed 8A, the solar panel voltage had been pulled down to just 12.6V. This shows that the controller had simply electrically connected the panels to the battery which is exactly what the manual said it would do when not on MPPT.

The manual shows that this Chinese manufacturer makes these in 15, 20, and 30 amp sizes and 2 Amazon vendors (Tektrum and Instapark) put their own label on it. Three other reviewers of various sizes of this unit have also concluded that this is a fraud and not MPPT. There were 3 more reviews of these but none tested them for MPPT.

I have requested a refund and filed an A-to-z Guarantee claim. After 2 weeks of hassle I still do not have a refund.

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