Watt Solar
Watt Solar
How long does it take to charge a 12v, 200AH Deep Cycle battery with a 125 watt Solar Panel?
Hey Alip, Graham is on the right track, his math is correct, but there are some inefficiencies here, mainly the voltage curve of panels and batteries during charging, and the heat losses inside the battery as well. Fortunately they are easily calculated.
A 125 solar panel that is wired for 12 volts (as most of them are), actually puts out about 18 volts open curcuit, and only 7 amps short circuit. But your battery will not see these voltages, once you connect the two together, the panels voltage will droop to match the battery, but the 7amps will remain. So the problem becomes simply a question of Amp Hours. If your battery is completely discharged, you will have to put back the 200 amp hours it holds, plus about 10% more. On a clear day, you might have sun for 8 hours, but the first 2 and last 2 are not full production because of the angle the sun is to the panel, and how much atmosphere the sun has to travel through. In most clear dry areas, we consider a good day of solar collection to be around 6 hours of direct noon time sun over the course of the day. With 7 amps flowing into the battery for 6 hours, you end up with 42 amp hours to work with, but since the battrey uses about 4 of them heating up and boiling some fluid away, only 38 are stored. At that rate, you would need 6 good days of sun to bring that battery back up to full.
If you’re considering hooking something like this up, you’ll also need a Charge Controller since the panels out put is more than 2% of the batteries Amp Hour capacity (4amps). Charge controllers today are pretty efficient though, maybe 98% or so, so it isn’t worth allowing for its losses in your system. If you had 2 batteries wired in parallel for 400 amp hours, you could skip the contoller, and spend that money on the second battery instead, then you would have twice the storage.
We live in a Solar Powered home, which happens to be powered by 16 125 watt panels. They run almost everything in the house, the lights, appliances and electronics. So you can go a long way with a panel like that if you learn to use your power judiciously. There are some great sources you can check out to learn more if you like, I will list some below. Take care Alip, Rudydoo
10 Watt Solar Panel (system #3)
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C&G Portable 40-watt Solar Panel Charger $176.05 Materials: Mono-Crystalline 40-watt portable solar chargerCapacity: 40WDesign: Foldable |
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Solar Powered 8-watt 18-volt Water Pump with Battery and Timer $150.99 Keep your fountain running with this solar powered water pumpGarden fountain pump comes with a battery to store power for night useWater feature comes with a timer for using at preset times |
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OEM 10-watt 16-volt Solar Panel with Charger Kits $69.83 Use the 10-watt 16-volt solar panel by Oem to power a convenient appliance with free green energy from the sun. With an amorphous crystal design, this solar panel performs both in the bright sun or partial shade. |
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1.3-watt Solar Fountain Pond Water Pump $51.99 Hard working solar powered pump maintains the relaxing gurgling sound of water Water fountain pump is powered by direct sunlightSolar panel is 1.3 watts |
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Timer Control 16-watt Solar Water Pump With Remote Control $227.99 Water solar pump is designed for fountain, pond, or outdoor usePowered by solar: save money and energy Water rate is adjusted by a variable speed valve |
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ISC400 400mA 5.5-watt iMob Solar Battery Charger $44.69 Stay powered with an iMob solar battery chargerSolar battery charger works in all weather conditions Auto part provides reverse charge protection |
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iMob 15-watt Solar Battery Charger $95.47 Stay powered with a 15-watt iMob solar battery chargerCar battery accessory boasts reverse charge protectionAuto part works in all weather conditions |
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iMob Charge Controller for 15-watt Solar Panel $24.24 iMob Solar Charge Controller is used with 15-watt solar panels to prevent overcharging and dischargingSolar battery charger is rated at 7 ampsBattery accessory is made for use with ISC1000 solar panels |
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Solar-powered 5-watt LED Light Water Pump System $122.11 Keep your garden looking great with this safe and environmentally friendly solar-powered water fountain pump. This pump can be used day and night with its backup battery and LED fountain light. |
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Solar 1-watt LED Landscape Spot Light Kit $48.99 Illuminate your pathway, doorway, shrubs, or backyard patio with this portable Solar LED kit. With a range of 25 feet and programmable settings for 4, 5, or 6 hour running times, this landscape spot light is an easy, one-time installation. |
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RoadPro RPSL-350 12V 1.5 Quart Slow Cooker $24.15 Plugs directly into your cigarette lighter socket – 1.5 quart stoneware crock is removable and dishwasher safe – cooker base with easy grip handles – glass lid with stretch cord to keep lid secure while traveling – 6 power cord – - – - -…… |
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15 Watt Folding Solar Battery Charger Works with Automobiles/Boats/Tractors/ATVs/Electric Fences/Deer Feeders/Telemetry and MoreMaintenance Free / Easy Installation Pre Cut Holes for Easy Installation4 Stainless Steel ScrewsBattery Clamps CLA Adapter12ft WireWorks in All Weather ConditionsUltra Bright Blue LED Provides Charging IndicationBuilt-in Blocking Diode Protects Battery Discharge at NightMade of Durable ABS Plastic with an Amo… |
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jiminie the christmas tree 45 rpm single … |
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VAN MEETEREN & HYDE / SOLAR BROTHERHOOD $8.54 ORIGINAL / TIGERSKIN / ANGELO D ONORIO 90 Watts Music is really proving to be a force on minimal circuit after introducing several new artists since 2006… |
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Westek SLC6CFL 100W Programmable Screw-In Light Control, White $6.50 Adds safety security and convenience. Programmable off-timer from 2,5,8 hours random off timer deters intruders. Contact plunger allows adjustment of sensor window direction for optimum performance. Works with incandescent and compact fluorescent bulb. Digital microprocessor for full brightness and no flicker operation. Turn lights on at dusk and off at programmed time…. |
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C. Crane BNB Bright Night LED Nightlight Bulb $4.85 Finish:Black The CC Vivid Bright Night puts out less light than a conventional 4-watt incandescent bulb, but it does serve the purpose of low illumination at night and lasts a long time. E12 type Candelabra base bulb Last 20,000+ hours Run cool Won’t shatter like glass Energy efficient. Fits most standard night-light fixtures 1.3 watts 2-year limited warranty… |
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Goal Zero Guide 10 Plus Adventure Kit 19010 $119.85 GOAL ZERO_GUIDE 10 19010 GUIDE 10 PLUS ADVENTURE KIT… |
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Tripp Lite PV1000HF PowerVerter Ultra-Compact Inverter 12V to 120VAC 1000 Watts (4) 5-15R Outlets $187.58 A bright red rooster keeps a fresh roll of paper towels right within easy reach. Colorful country style is easy with this clever countertop companion! weight 1.3 lbs. Resin and wood. Paper towel not included. 5 1/2 diameter x 12 high……. |
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M3-ATX, 125w output, 6v to 24v wide input Robust and Intelligent Automotive DC-DC Car PC Power Supply $66.00 Intelligent Automotive / Car DC-DC ATX PC Power Supply Plug-In Smart car PC PSU |
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Array Solar Laptop Charger (Charcoal) $389.00 The Array Solar Backpack both carries and charges your laptop. It will also charge cell phones, tablets and digital cameras. The front solar pocket is removable and can be attached to other bags for convenient charging. Besides charging all your electronics, it has 1,500 cubic inches of storage space, a padded laptop sleeve, integrated phone pouch and plenty of other pockets…. |