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Let's suppose there is a battery which powers a DC load. There is a solar panel which gives power from time to time. How do I connect them all together so that the solar panel powers the load and charges the battery when the sun comes out and the load is powered by the battery the rest of the time?

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  • \$\begingroup\$ What, exactly, is an accumulator or a consumer? I would guess 'consumer' means load... is an 'accumulator' a capacitor? \$\endgroup\$
    – Hearth
    Commented Apr 25, 2017 at 19:39
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    \$\begingroup\$ Solar charge controllers are made for this. ( an "accumulator" is a rechargeable battery - traditionally, lead-acid) \$\endgroup\$
    – user16324
    Commented Apr 25, 2017 at 19:52
  • \$\begingroup\$ @Felthry I meant solar panel, battery and DC load. Sorry for my English. \$\endgroup\$
    – olegst
    Commented Apr 25, 2017 at 20:45
  • \$\begingroup\$ That's fine! It just wasn't terminology that was familiar to me, and I didn't want to try to answer a question I didn't understand. \$\endgroup\$
    – Hearth
    Commented Apr 25, 2017 at 20:46
  • \$\begingroup\$ The answer to this question depends on what load you are powering and if it needs to operate without intervention. Take a look at electronics.stackexchange.com/questions/80804/… for some interesting discussion on the simplest way (and its limitations) to wire a solar panel, battery, and load together. \$\endgroup\$
    – lswim
    Commented Apr 25, 2017 at 21:32

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Basically, you would need two DC-DC converters, one would charge the battery from the solar panel, and the second one would power your load from the battery.

To be efficient, the solar-battery converter would need to implement an MPPT (Maximum Power Point Tracking) algorithm, and both converters would have to manage battery to avoid Overvoltage/Overcurrent issues.

The exact topologies depend on your Solar panel, battery and load Voltages.

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