# How To Interface 12v 10w Solar Panel To 12v 1.3ah Battery

#### vijaykrishna

Sep 9, 2017
35
I need to connect 12v 1.3Ah battery to 12v 10W solar panel do i need any circuit for it or i can directly connect them? also i want to power arduino from that battery.

#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,506
Place a 14V 20W zener across the solar panel, then connect it to the battery via a 1A diode.

This should charge the battery to about the float charge voltage (check the battery specs for more details)

#### vijaykrishna

Sep 9, 2017
35
Thanks,

Can I connect 12v 1.3Ah battery to arduino DC pin???

#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,506
If it has a voltage regulator you can

Sep 9, 2017
35
like, 7812?

#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,506
No, like a 7805.

The microcontroller requires 5V. Many arduinos have a voltage regulator allowing them to be powered from a higher voltage. If you're using one that doesn't, then 12V will kill it very dead.

#### Doug3004

Sep 5, 2014
119
I'm not much of an expert on solar panel systems,,, but it seems to me that using a 12v panel to charge a 12v battery is not usually how it's done. Unless you're talking about the little solar LED yard lights, that are basically just a solar cell hooked right up to a NIMH battery.... but those are not a normal occurrence, and that only works on a fairly small scale (kinda like running a LED straight off a button cell, with no dropping resistor).

What I've seen is something like this: a solar array that puts out 24 volts--or more--in bright sun, connected to a charge controller that needs at least 18 volts to work, and that in turn is set to charge a 12v battery (to about 14 volts or so).

The practical problem with solar panels is that they put out a very limited amount of current.
When you start drawing current off them, the voltage tends to drop WAY down.

#### vijaykrishna

Sep 9, 2017
35
No, like a 7805.

The microcontroller requires 5V. Many arduinos have a voltage regulator allowing them to be powered from a higher voltage. If you're using one that doesn't, then 12V will kill it very dead.
i got 12v dc female connector in my arduino

#### (*steve*)

##### ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd
Moderator
Jan 21, 2010
25,506
In that case your arduino has a voltage regulator on it (some don't)

#### vijaykrishna

Sep 9, 2017
35
In that case your arduino has a voltage regulator on it (some don't)
yes it has

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