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Building battery for powering 2 charge units (12 Volt 3s/4s)
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I shortly will receive an order of 2 testers. An Opus BT-C3100 and a Liitokala Lii 500.

First before testing used 18650 cells I want to build a 12 Volt battery; 3s or 4s . Powered out of small solar equipment. For these little project I prefer new cells. Learning the things on small scale.

When (dis)charging 4 batteries at a time each. How many power (Ah) need these units for their (dis)charge cycles? 
Both chargers have 12 volt input.

Anyone who can tell me what battery capacity I need? Running almost every day testing cells.

Goal: testing 18650 cells for use in powerwall project the upcoming year.

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