Self-made simple battery discharge meter circuit diagram

A battery discharge meter was built using a brush controller (48V × 8A ≈ 400W) of an electric vehicle, as shown in Fig. 1. When the battery voltage drops to 42V, the brush controller no longer outputs and sounds an alarm. 48V electronic horn for electric vehicles. The time measurement system directly uses the electronic clock on the market. When the electronic clock is powered, it starts to count from "0.00". When the speaker sounds an alarm, the time displayed by the electronic clock is the time when the battery is discharged. Multiplying the discharge current by this time is the actual capacity of the battery.
/>  In actual use, the positive end of the discharge meter is soldered with a red clip to the positive pole of the battery pack, and the negative end is soldered with a black clip to the negative pole of the battery pack. At this time, the electronic clock starts to sound, and the speaker emits a loud sound. Alarm sound, quickly press ANI (button switch without self-locking), the speaker will no longer beep, and the ammeter should have a discharge current indication. When the voltage of the battery pack drops to 42V, the controller will stop output, the relay K will lose power, the normally open contacts K1 and K2 will be disconnected, the discharge will not continue, the normally closed contacts K1 and K3 will be closed, and the speaker will be loud. The alarm sounds, indicating that the discharge is complete. At this time, record the time displayed by the electronic clock. This time is the discharge time of the battery pack, and then multiply the discharge current by this time to estimate the actual capacity of the battery pack. This method is convenient and practical, and interested colleagues may wish to give it a try. </p> </div> <div class="tech-detail-share"> <!-- Baidu Button BEGIN --> <div class="bdsharebuttonbox"> <a href="#" class="bds_qzone" Data-cmd="qzone" title="Share to QQ space"></a> <a href="#" class="bds_tsina" data-cmd="tsina" title="Share to Sina Weibo">< /a> <a href="#" class="bds_weixin" data-cmd="weixin" title="Share to WeChat"></a> <span>Share to:</span> </div> <script >window._bd_share_config = { "common": { "bdSnsKey": {}, "bdText": "", "bdMini": "1", "bdMiniList": false, "bdPic": "", "bdStyle": "2", "bdSize": "16" }, "share": {} }; with (document) 0[(getElementsByTagName(

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