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12VDC Solar to 1.2VDC Regulator?


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ccinpa 
Member - Posts: 10
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Joined: February 09, 2016
Location: Pennsylvania, United States
Posted: August 23, 2019 at 7:36 PM / IP Logged Link to Post Post Reply Quote ccinpa
I have a requirement to connect a 12VDC Solar-panel to a 1.5VDC device. Since the 12-volts may fluctuate, I need some sort of regulator? If so, what type?
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: August 24, 2019 at 6:19 PM / IP Logged Link to Post Post Reply Quote eguru
A buck converter like this should be more than adequate:
https://abra-electronics.com/voltage-regulator-modules/psm-160-5a-step-down-converter.html
even this one would be more than adequate:
https://abra-electronics.com/voltage-regulator-modules/psm-260-mini-4.75-23-vdc-to-1v-17vdc-step-down-converter.html
ccinpa 
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Joined: February 09, 2016
Location: Pennsylvania, United States
Posted: August 24, 2019 at 7:02 PM / IP Logged Link to Post Post Reply Quote ccinpa
Thanks... The examples you were very helpful! Forgot to mention, need waterproof too. 12VDC Solar to 1.2VDC Regulator? -- posted image.
So I am looking at this:
https://www./itm/Waterproof-Adjustable-DC-DC-Buck-Voltage-Converter-8-22V-to-Regulated-1-15V-3A/162787166486?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m1438.l9372
I read the work "regulated". If the input fluctuates, will the output remain steady?
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: August 25, 2019 at 7:49 AM / IP Logged Link to Post Post Reply Quote eguru
I couldn't reach the page you linked but if it says "regulated" the output should remain reasonably steady over the specified input range of 8-22V.
Since whatever you are powering was using a 1.5V battery, the regulation doesn't need too be too tight.
However, since you are powering from a "12V" solar panel, I would look for a lower input voltage range than 8V.
You could easily waterproof the units I have linked by sealing them into a small plastic (pill) bottle.
ccinpa 
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Joined: February 09, 2016
Location: Pennsylvania, United States
Posted: August 25, 2019 at 9:17 AM / IP Logged Link to Post Post Reply Quote ccinpa
I like a challenge(no matter the size), then a solution
With all the helpful input... Here is what I came up with. Thoughts? 12VDC Solar to 1.2VDC Regulator? -- posted image.
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: August 25, 2019 at 3:18 PM / IP Logged Link to Post Post Reply Quote eguru
How is your 24VDC solar panel going to charge your 12V battery?
Overall, I think this is overkill for for a lawn ornament.
ccinpa 
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Posted: August 25, 2019 at 4:41 PM / IP Logged Link to Post Post Reply Quote ccinpa
This is why I'm here... For solutions?
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: August 25, 2019 at 6:42 PM / IP Logged Link to Post Post Reply Quote eguru
Why do you need the battery. Does the load have to run 24/7 and for extended periods.
What is powering your load now - a battery? what size - how long does it run on a battery before it stops working.
Answers to those questions (and anything else you can tell us about your project) will help with determining the best solution.
ccinpa 
Member - Posts: 10
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Joined: February 09, 2016
Location: Pennsylvania, United States
Posted: August 25, 2019 at 7:18 PM / IP Logged Link to Post Post Reply Quote ccinpa
eguru wrote:
Why do you need the battery. Does the load have to run 24/7 and for extended periods.
>>> I believe I need the battery to compensate for the low-sunlight times? Only need power during daylight-hours
What is powering your load now - a battery? what size - how long does it run on a battery before it stops working.
Yes a battery - 1.5v 1w. Works for about 18-hours.
Answers to those questions (and anything else you can tell us about your project) will help with determining the best solution.
eguru 
Copper - Posts: 340
Copper spacespace
Joined: February 04, 2018
Location: Quebec, Canada
Posted: August 29, 2019 at 9:34 AM / IP Logged Link to Post Post Reply Quote eguru
ccinpa wrote:
eguru wrote:
Why do you need the battery. Does the load have to run 24/7 and for extended periods.
>>> I believe I need the battery to compensate for the low-sunlight times? Only need power during daylight-hours
What is powering your load now - a battery? what size - how long does it run on a battery before it stops working.
Yes a battery - 1.5v 1w. Works for about 18-hours.
Answers to those questions (and anything else you can tell us about your project) will help with determining the best solution.
A 1.5W solar panel isn't going to charge a battery and run your 1W load. Since you don't show anything in your diagram that is going to turn off the load during the night, you would need to be charging the battery with at least a 5W solar panel in order for your load to operate 24/7. The conversion efficiency of the dc-dc converter also needs to be taken into account along with the self-discharge of the lead-acid battery.
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