How long would it take to charge a 212 amp hour 12 volt deep cycle battery using a 60 watt solar panel?
I’m trying to develop a DIY grid tie system & know only the basics about electrical work.
No worries guys I’m a master plumber & have a friend who is a master electrician who would be doing all the wiring. He wasn’t around for me to ask initially. Thanks for the answers!
A typical 60W panel has a 4A short circuit current from spec in first link below. This is most likely about 3.5A of peak sun charging current.
Depending where you live, you may get 2 to 5 hours of peak sun charging current a day. You should be able to find this figure on the internet for your area. It is the number of equivalent full sun hours (that the panel will provide 3.5A). It will take all the daylight hours to achieve this equivalent. Lets say you have 3 hours equivalent, so you will get 3.5A x 3h = 10.5Ah per day average.
The battery is 212Ah, so it takes (1.4 x 212 = 300Ah) to charge it. How many days is this? Divide 300Ah by 10.5Ah per day to get 29 days. This assumes no power lost from the battery over that time. Basically the battery (depending on type) could lose almost that much charge over a month from self discharge, so this panel would just keep a battery of this size more or less fully charged if there is no load.
With an MPPT (Maximum Power Point Tracking) controller this figure could be improved, as the charge is derived from the maximum power, not the maximum current, and could provide more current than the maximum from the panel (using internal electronics).
If you want a grid tie system you need a higher voltage to operate the grid tie inverter. You don’t need batteries, that is one of the reasons for using such a system. These inverters typically require 150-500V from the panels. This is for good reasons of efficiency and cost. Look up “Sunny Boy” (a German model popular in the US and Australia and Europe at least) to get an idea. This inverter adjusts the load automatically to use the input voltage that gets the maximum power from the panels (MPPT tracking). You need 10 x 12V panels in series to get this voltage. That means you can deliver about 600W to the inverter. Usually smaller systems target 1KW as the power from the panels, using bigger panels, or 24V modules etc. The design starts with the total wattage of the panels, as this is the high cost item. A 1KW system may not export much power at all.
I recommend you research this much further, or get some sort of consultancy with someone familiar with your region before you go ahead. There are plenty of references on the web. The wiring is at voltages similar to household voltages so you should get a suitably qualified electrician to do that work.
I know it seems disappointing, but the power from a solar panel is small compared with household use, especially as the full power only occurs a few hours a day. For example, the standby power from your appliances alone will exceed the 60W rating of the panel, so it makes economic and environmental sense to eliminate that by turning things off at the wall outlet. This panel could perhaps power such a small thing as a network router on a 24 x 7 hour basis.
Depending where you live, solar hot water may make more sense than an electrical system, as it represents more energy saving due to higher efficiency, and also is more practical for a DIY project.
You may get government grants, Renewable Energy Certificates (RECs) etc. to offset the cost of some systems in some regions. Hope this helps.
Greenworks 21602 20-Volt Lithium Ion 12-Inch Cordless Electric String Trimmer/Edger with 6 Amp/Hour
|UPG 6V 12ah 6 Volt 12 amp hour SLA Battery RBC52 Tripplite
|12 Volt 18 Amp Hour Upgrade Battery for Modified Power Wheels New w/Warranty – 4 Pack
UB12180 NB 12V 18AH – Absorbant Glass Mat (AGM) technology for superior performance. Valve regulated, spill proof construction allows safe operation in any position. Common uses for the UB12180: Consumer Electronics, Electric Vehicles, Engine Starters, Golf Carts, Hunting, Lawn and Garden Tools, Medical Mobility, Motorcycles, Photography, Power sports, Portable Tools, Solar, Toys and Hobby, Acc…
|Powersonic PS-612 – 6 Volt/1.4 Amp Hour Sealed Lead Acid Battery with 0.187 Fast-on Connector
This is a replacement SLA battery for Power Sonic PS-612 with Terminal F1 (0.187″ x 0.032″). We supply only brand new, factory fresh, high quality batteries. We guarantee the best price and 100% compatibility with your Power Sonic PS-612 model. The replacement sla batteries also include a minimum of one year warranty. Popular applications for our sla batteries are UPS, emergency lighting, security…
|EnerSys Genesis (Yuasa) NP1.2-12 – 12 Volt/1.2 Amp Hour Sealed Lead Acid Battery with 0.187 Fast-on Quick Disconnect Terminal
Today’s Genesis NP Series is the culmination of more than ten decades of battery manufacturing experience. High energy density, leak proof construction, excellent performance in either float or cyclic applications and long service life combine to make the Genesis NP Series the most reliable and versatile maintenance free rechargeable sealed lead acid batteries available….
|Powersonic PS-6100F1 – 6 Volt/12 Amp Hour Sealed Lead Acid Battery with 0.187 Fast-on Connector
The Power-Sonic Corporation has been a leading force since 1970 in the supply of high quality cost effective batteries. Power-Sonic markets an extensive range of rechargeable sealed lead acid batteries worldwide. These batteries envelop a broad spectrum of electronic and industrial applications, either as the prime or standby power source. Engineers and buyers continue to insist on Power-Sonic bat…
|Yuasa (Enersys) Genesis NP7-12T – 12 Volt/7 Amp Hour Sealed Lead Acid Battery with 0.250 Fast-on Connector
Yuasa NP7-12T F2 12V 7AH SEALED LEAD ACID BATTERY F2…
|UB1250 SLA Battery 12 Volt 5 AMP Hours [Electronics]
Our Sealed Lead Acid batteries made with the highest quality parts and are guaranteed to be compatible with your original equipment. VRLA batteries are used for many different applications including medical devices, emergency lighting, mobility, security, and uninterruptible power supplies (UPS). This battery comes with a full one year warranty from Advanced Battery Systems, Inc….
|DEWALT DC9096-2 18-Volt XRP 2.4 Amp Hour NiCad Pod-Style Battery (2-Pack)
Keep your DEWALT 18-volt cordless tools powered with the DC9096 XRP extended run time batteries. DEWALT uses top-quality NiCd cells, offering a consistent and adaptable performance. The extended run time batteries deliver 40 percent more run time with new cobalt technology….
Incoming search terms:
- 9 volt amp hours
- 9 V battery amp hours
- 9 volt battery amp-hours
- Battery Volt-Amp-Hour Capacity
- higher voltage means to batteries 20v
- Volt Amp Hour Capacity