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                               Scott MacGregor
                            Plainville, MA 02762
                          Phone: (508) 695-3717
                            Fax: (508) 643-0233

                                          Testimonial 

I've recently installed the "powercheq" units in a EMX racer and the two
units fit nicely on the side of the forward battery (up in the well). I can
see the LED's and the voltage equalization was w/in 0.05VDC between the 3
batteries. Wiring was straight-forward and I would suggest to other
customers to enumerate the battery terminals i.e. #1...#6. etc. to follow
the correct wire install and disassembly sequence.

Regards,

Lenard Pond

PowerCheq Module

Installation Diagram of PowerCheq Installed Across a Series String of Batteries

 

PowerCheqä is a bi-directional equalization device that is connected across pairs of batteries within a string. A battery string with N batteries requires N-1 PowerCheqä modules. The PowerCheqä modules interconnect batteries in a series string creating a bi-directional transfer path between neighboring batteries and enabling the entire battery string to be balanced.

This balancing action occurs during charge, discharge, and while the batteries are sitting idle. Bi-directional equalization ensures that all batteries in a string are equalized no matter where the low voltage battery is located. During the charge cycle your batteries run the risk of being overcharged due to variations in battery chemistry and internal impedance. PowerCheq works to ensure that all of your batteries are being charged at the same rate, negating the effects of over and undercharging of batteries within the string.

With PowerCheq continuously working to balance your batteries during charge, discharge, and idle periods, you can have peace of mind that your system will be there when you most need it.

 

Increases Vehicle Performance: The batteries will provide almost the same range, acceleration and power characteristics months down the road as they did on day 1, if they have a PowerCheq.

Increases Reliability: PowerCheq eliminates the "Weakest Link" problem associated with batteries in series.

Longer Battery Life: With PowerCheq installed, tests have shown batteries lasting 2 and almost 3 times their expected lives.

Reduces Maintenance Costs: PowerCheq reduces the number of battery related service visits to end-users.

A key function of PowerCheq is to ensure that all of the voltages within the battery string remain balanced. In keeping the voltages balanced, PowerCheq prevents any of the batteries within the string from being over or undercharged. A further look at the individual battery voltages for both packs during a charge/discharge cycle can shed more light on the performance of the battery equalizers on a cycle by cycle basis. Figures 1 and 2 show the individual battery voltages of both packs during the 130^th charge & drive cycles.

Figure 1 Figure 2

It is visible that in Fig. 1, the battery voltages are varied, causing the under and overcharging of batteries in the string. Whereas, in Figure 2, the battery string equipped with PowerCheq, the battery voltages are held tightly together allowing for the batteries to hold a fuller charge and run for longer periods of time.

Battery life is increased by nearly 300%. As seen in Figure 3, the battery pack without PowerCheq goes through approximately 140 charge/discharge cycles before reaching its end of life. The battery pack with PowerCheq lasted approximately 440 charge/discharge cycles before reaching its end of life.

Figure 3: Comparison of Battery Life

Increased reliability and performance are additional benefits that PowerCheq brings to the end user’s battery string. These benefits are possible through PowerCheq’s ability to maintain the battery’s capacity as seen in Figure 4.

Figure 4: Comparison of Battery Capacity

As shown in the figure, the capacity of the Pack 2 (with the equalizers) was not affected by cycling throughout more than 300 cycles. On that other hand, Pack 1's capacity (without PowerCheq) started declining from onset of the test. The decline in the capacity of Pack 1 (without equalizer) was caused by one module that became out of balance with the rest of the pack. It is interesting to note that over the first 140 drive cycles Pack 1 (without PowerCheq) lost nearly 35.5% of its initial capacity while the Pack 2 (with PowerCheq) gained nearly 6% based on Ah output.

*Please call for availability and applicability.