For loads above 700 Watt per hour, it is recommended to buy >1 battery to fulfill the requirement.Exact capacity requirement may not available in the market, so go for near higher capacity battery.Above Calculations are made assuming, Voltage – 12v Battery Efficiency – 80%.We have created a Backup time vs load comparison table for your ready reference to take an appropriate decision. Same capacity batteries may not be available in the market, so you can go for those above 120 ah e.g 150 Ah battery.Īlso Read: 10 BEST INVERTER BATTERY FOR HOME IN INDIA 2021īATTERY CAPACITY TABLE – BACKUP TIME VS LOAD – FOR QUICK REFERENCE: PLEASE NOTE: All downloads require a valid login. Choose any of the available links below and you will be directed to the individual download screen where you can download your product. Therefore, in this case, a battery with 120.3125 Ah of capacity should serve well. This central download list page shows a full list of downloadable versions, updates, and documentation. To understand the above formula, Assume the following numbers. In general, all the major brand’s inverter delivers 80% i.e 0.8 efficiencies.īattery Capacity = ( Total Load In Watts X Usage time ) / (Input voltage X efficiency %) This efficiency of discharge varies from the inverter to the inverter, which you can find in the product catalog or product manual. While discharging current by inverter there could be some loss of energy, which is unavoidable. This table is mainly for IP camera setup but using the same formula you can calculate the storage capacity. Considering the format loss of the disk is about 10, the required disk capacity will be 55TB (49.45TB ÷ (1-10)). You can check this in your product or user manual. The mainstream is 4096Kbps and the substream is 1024Kbps, then the total recording capacity is 49.45TB (39.56TB + 9.89TB). In India, almost all the inverter batteries have 12V of the input voltage. This simply means the voltage of the battery. One should go for a minimum of 3 hours back up time considering Indian climatic conditions and resource availability. You can estimate this by calculating the average time of power cut your area gets.įor example, usually, if power cuts in your area are 3 hours long, that means that you would usually need a power backup of 3 hours. This simply means, how long do you want the battery to last when there is a power shutdown. Note: Calculate the load requirement of only those appliances which you have connected to the inverter or planning to use during power cuts by connecting to an inverter. Use our simple load calculator to calculate the Watt requirement per hour. Actual file size may vary depending on the amount of motion and the compression used. For example, the Windows system uses 1,048,576 (1024 2) bytes per MB. The watt that each appliance uses is usually mentioned in the package of the appliance. Discover Video uses 1024 2 for a MB rather than 1000 to be more consistent with file systems. Hence, the load on the inverter will be 385 watts per hour. Dahua security camera surveillance DVR systems have no built-in “forgot password” or factory reset capabilities, so it is possible to lock yourself out of the DVR if you forget the password for all administrator users.As an example, let’s assume you want to power, 4 lights of 40 watts and 3 fans of 75 watts each. Solution:ĭahua DVR systems include a secret override password that is calculated based on the system date and time. The calculation used depends on the particular DVR model. There are a number of web sites of unverifiable reputation that offer to calculate these passwords for you, for a fee. Dahua support may also provide this service for a fee. Use Panasonic Securitys video storage and bandwidth calculator to assist with your VMS storage needs. However, there are a small number of free calculators out there. UTC is Coordinated Universal Time, GMT is Greenwich Mean Time. Great Britain/United Kingdom is one hour ahead of UTC during summer. Input resolution, compression, data range and more. Most provide only one of the possible calculations, but I was able to find one site that performs three (possibly all) calculations. For the model I was working on, the second password worked, but all other calculators I came across gave only the first option. Procedure:Įnter the day and month as a 1- or 2-digit number, and the year in 4 digits, as displayed on the DVR screen. Use the generated passwords for any administrator user and once you are in the menus you can change any passwords to a new one. The date provided must be exactly as shown on the DVR, otherwise the generated code will not work. It is also not clear if these three possibilities cover all Dahua DVRs on the market, so some models may not be accessible by this method.
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