Presentation on theme: "BHG Power Storage Solutions (Pty) Ltd Presented by: Nollie Moorcroft Tel No: 011 827 8704 Mobile No: 082 454 2817 Fax No: 086 675 0986"— Presentation transcript:
BHG Power Storage Solutions (Pty) Ltd Presented by: Nollie Moorcroft Tel No: Mobile No: Fax No: Web: VISION STATEMENT To help South African consumers reduce their energy consumption and dependence on carbon based fossil fuels. To become a market leader in the design and implementation of sustainable energy saving solutions. To educate consumers on the benefits of using solar water heating, heat pumps, water harvesting and solar PV systems. To extend the life of batteries to double their lifespan
Index Front Line Battery Monitoring Battery Measurement Reasons for Battery Failure Battery Chemical and Electrical Properties Measurement Software Overall Benefits
Director and Management Profile Nollie Moorcroft – Managing Director – General Management Rodwell Kahondo –Director – Sales & Production Manager Charlene Joubert – Personal Assistant Cora Moorcroft – Admin & Office Administrator Frik Swanepoel – Stock Controller Blessings Magombo – Workshop Manager PDI Status 51% Director – Rodwell Kahondo 49% Director – Nollie Moorcroft COMPANY INFRASTRUCTURE
BATTERY MEASUREMENT Voltage Impedance Battery voltage and impedance measurement is not enough as they are only gross electrical indicators of a battery function and provide only limited information about battery health This measurement are less than 100% reliable in detecting batteries that are near failure, therefore increases the cost and risk of battery ownership
Reasons for Battery Failure Corrosion on positive plate Sulphation Temperature Over charging / Dry out Over discharging Manufacturer defects
Indication of Battery Health Battery sulphation and dry out are chemical properties of a battery and are precise, leading indicators of battery health They provide essential information about when a battery will fail More importantly they show when and how to apply corrective action when caring for batteries and extending battery life
Battery Chemical and Electrical Properties Measurement The EC1000 are the only Electro Chemical Battery analyser that measures a four electro-chemical parameters (SDVI) of batteries in a single measurement The EC1000 uses CELScan Technology This is a patented broadband swept frequency response analysis technique that accurately measures the electro-chemical status found in batteries
Technology Over the next six months, impedance trends indicated improvements in health, not only for the most affected cells but for almost every cell in the string. In contrast, some cells within a string that received no corrective action showed progressive deterioration. Effective management of a battery installation requires timely information about the condition of each battery unit (cell or mono-block) within the installation. To satisfy this requirement, EC1000 and EC2000 was developed. It is a hand-held Analyzers, which measure electrochemical impedance characteristics of a battery over a range of AC frequencies
Technology The measurements are processed by BHG Power Storage Solution algorithms to provide information not only about which battery units are approaching failure but also about the nature of those failures. All cells are not created equal and this fact has major consequences for the reliability of batteries. In particular, the useful life of a battery or string cannot be projected simply on the basis of typical cell data because interactions among the cells during operation will inevitably shorten the life of all of them. For the same reason, no single set of test results can reveal cells that are aging abnormally. Only by analyzing trends in test results over a period of months or years is it possible to identify components (cells, monoblocs or interconnections) that may require attention.
Technology Cell performance charts published by battery suppliers are usually presented as “typical” and the user is cautioned that practical results may differ greatly, depending on operating conditions and other factors. One factor rarely addressed by the suppliers is the intrinsic variability of battery cells. At best, the useful life of a multi-cell battery (or battery string) can never exceed that of its weakest cell and actual battery life can be even shorter. Strong cells wear out more rapidly because they must work harder to compensate for weaker cells, while weak cells get overstressed with each charge and discharge cycle, degrading them even faster. Furthermore,the difference between published and actual life expectancy increases with the spread in individual cell characteristics. Regularly monitoring the extent of this spread provides vital information about the health of a battery string. On the other hand, an operating plan that relies primarily on “typical” life curves will almost certainly lead to premature (and potentially catastrophic) system failures.
Technology According to IEEE (The Institute of Electrical and Electronics Engineers), the only sure way to assess the health of a multi-cell battery is to perform regular capacity tests on every cell. However, because it is rarely feasible to perform capacity tests more often than once every 1-5 years, IEEE recognizes the value of alternative inspection methods that can be performed at shorter intervals, stating in part that: Internal ohmic measurements can be used to evaluate the electrochemical characteristics of battery cells. They may provide possible indications of battery cell problems and may identify those cells having internal degradation. Ohmic measurements can be used as a trending tool to identify cells that may require further evaluation. When significant changes from the baseline occur, capacity testing should be used to verify whether identified cells are in fact defective.
Software Battery test is store, analysed and automatically formatted into a variety of presentations-ready reports using IBMS(Intelligent Battery Management System) With IBMS the EC1000 and EC2000 it stays up to date with the latest, new measurement performance features and capabilities that can be downloaded from the WEB The EC1000 and EC2000 automatically calculates the proper battery measurements limits(Alarms) It provides automatic pass and fail warning, visual and audible feedback as to the process in measuring each battery in the string It stores up to 50,000 battery test data including string configurations and other site details All data can be downloaded to your computer using IBMS
Test Results Fig 3
Test Results The yellow and red lines in these charts represent “Warning” and “Fail” levels that were chosen by the operator. It is immediately apparent from these charts that, while most of the cells were operating within acceptable limits, there were several cells that required attention. Note that none of the cells in this string were flagged as abnormal by either of the conventional measurements of float voltage or (single-frequency) impedance. The only indicator that detected abnormal cells in this string was the relative sulfation level.
Test Results Fig 4
Test Results Fig 5
Test Results Fig 6
Test Results Based on the abnormalities apparent from Figures 3 and 4, a program of regular equalization procedures was recommended. Data collected on the same cells six months later are shown in Figures 5 Comparison of Figures 4 and 5 shows that equalization successfully lowered the sulfation Levels of all three abnormal cells. To see how these cells fared over time, we generated “cell history” bar charts of the individual sulfation parameters over a six-month period. Results for four of the cells highlighted above appear in Figure 6.
Test Results Fig 7
Test Results Fig 8
Test Result Fig 9
Summary These results clearly demonstrate that virtually all cells in String A derived significant benefit from the de-sulphation procedure. By de-sulphating on regular intervals will improve battery capacity and life expectancy However, as shown in Figures 8-9, very different trends were observed on a string of 120 cells that did not receive de-sulphation procedure.
How Frequent Bi-annually.
Overall Benefit Identify bad battery before failure Reduce battery replacement cost Reduce labour cost by not over testing batteries Reduce or eliminates the need to measure specific gravity Reduce the need of load testing Reduce lost revenue by avoiding system shut down due to battery failures Reduce risk to capital and personnel
BHG Power Storage Solutions (Pty) Ltd Reg No: 2014/043541/07 Vat No: Tel No: Mobile No: Fax No: Web: