4 votes
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Charging two 18650 batteries separately but using them in parallel in one circuit

As far as my understanding goes, you're probably better off making a pack out of the two cells and both charging and discharging them together. When you connect two cells of different charge states ...
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3 votes

What happens if a 12V battery is constantly exposed to a 12V power supply?

13.8V is the full charge for a 12V lead acid. So once it charged up to 12V (or if the battery and charger survived the battery catastrophically discharging down to 12V) it would just sit there partly ...
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3 votes
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What happens if a 12V battery is constantly exposed to a 12V power supply?

Lead acid can be float charged indefinitely at the recommended voltage; typically 13.4V. Check your battery datasheet for exact numbers. Note you will need a current-limited and slightly voltage-...
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3 votes

Inverter battery charging

A simple example: Inverter is 80% efficient. Battery charger is 90% efficient. Battery charger is charging at 100 W. Battery charger is drawing 100 / 0.90 = 111 W from the inverter. Inverter is ...
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2 votes
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Why is this LM317 giving an unexpected output?

Other replies and chats presented some reasons for the problem you mentioned: ... It worked amazingly well when I connected different batteries, such as 3.7V, 6V and 12V, but when I connected charger ...
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2 votes

What happens if a 12V battery is constantly exposed to a 12V power supply?

Given that your battery is a nominal 12V lead acid battery, it will be fine. Under ideal conditions the battery would maintain a constant charge of 12V and no current would flow into or out of the ...
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2 votes

Charging two 18650 batteries separately but using them in parallel in one circuit

I presume the charger stops at 4.20V +/-x % and then slowly decays to a plateau voltage due to a double layer charge effect. So time delays might cause a voltage difference, but it shouldn't be ...
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1 vote

What happens if a 12V battery is constantly exposed to a 12V power supply?

A state-of-the-art lead-acid charger actually has a 3-tier charge curve, designed to avoid stressing or overcharging the battery. The ideal float voltage depends on the lead-acid construction. ...
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1 vote

Can I use a PWM solar controller for charging a 24V battery from a 50V solar panel

The solar cell won't be operating at 50V since Voc implies zero current draw. You will need a solar panel controller to effectively use the panel. Applying 50V to a 24V battery with no intermediate ...
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1 vote

Charge a 12V 90Ah led acid battery using 12V 20A SMPS

Your question: If I use the above SMPS will that SMPS reduce the current accordingly or give the total 20A current? Short Answer: Most probably it will not provide an adequate current, triggering ...
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1 vote

Charge a 12V 90Ah led acid battery using 12V 20A SMPS

No, because a switch mode power supply is not a battery charger. Power supply can also be damaged when connected to another voltage source, the battery. You need a battery charger to charge batteries. ...
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1 vote

Charging Power Banks from Electric Car Charging Stations (DIY, LiFePO₄)

It is not very practical to charge such a small battery from an EV charging station. If your battery is only 0.7kWh the normal charging power to charge in four hours would be about 200W. I'm surprised ...
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1 vote

Add old lead acids to parallel or replace them

i have a solar home system that we purely use for trials and errors. Combining dead(or almost dead) battery with healthy one could affect the healthy battery and minimizing it life. It will ...
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