![]() You need charge controllers for two reasons: ![]() If you plan on storing your solar energy in batteries, yes. If you are going for this kind of battery, you will need a module that can store a little more than your daily energy production capacity. In addition, you can drain about 95% of its stored energy without causing permanent damage or negatively affecting their life cycle. On the other hand, Li-ion batteries are much safer and more durable than lead-acid batteries. If you produce 400 Wh of solar energy a day, then an 800 Wh battery would be ideal. So, to be safe, use a lead-acid battery that is double the size of your average solar power production a day. You can’t drain more than half of the energy you store in these batteries. Lead-acid batteries have low depth of discharge.
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