This question is regarding charging circuit for Lithium Iron Phosphate batteries.

I have a pack of Lithium Iron Phosphate batteries rated 3.2 V / 7.5Ah which will drive a circuit. According to the data sheet provided by the vendors, they have told me to just keep voltage under 3.6 V and maximum current of 1000 milli Amperes while charging and I should be fine.

My charging source is a solar panel of rated 5.5 V and 500 mA. Since they have a protection circuit which will take care of Constant Current & Constant Voltage , short-circuit and over charge/ undercharge, can I just use a 3.6V Zener Diode and a forward biased pn junction Diode in the circuit to ensure the voltage does not shoot above 3.6V and if the panel's voltage is below 3.6V, the diode is going to protect it.

Is this approach okay? Or is it complex than this? Thanks.

  • \$\begingroup\$ can you add empty lines ("paragraphs") at logical sections in your text? This is unnecessarily hard to read. Also, I'd recommend you pick either writing out Units ("Volts") or abbreviations ("V"). I prefer the latter, but please don't mix these two variants. \$\endgroup\$ Aug 26, 2017 at 16:35
  • \$\begingroup\$ Thank you! Much better to read, and a question good enough to warrant an upvote! \$\endgroup\$ Aug 26, 2017 at 17:33
  • \$\begingroup\$ @MarcusMüller New to posting questions. Thank you too for the guide. :) Any info on the subject matter would be appreciated since you have a background on batteries. \$\endgroup\$
    – Mahip
    Aug 26, 2017 at 18:26
  • \$\begingroup\$ Didn't you mean 3.6 V Zener diode? \$\endgroup\$ Aug 26, 2017 at 22:46
  • \$\begingroup\$ @AliChen Sorry, I meant it so. Edited it now. \$\endgroup\$
    – Mahip
    Aug 27, 2017 at 9:12

1 Answer 1


I've found that TP 5000 http://vrtp.ru/index.php?act=Attach&type=post&id=585578 fits my requirement.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.