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
|AILI® DC Programmable Meter Controller 0-200V 0-400A Volt Amp Power Ah Auto Shut Down Car Motor Boat Motorhome Solar Wind HHO Power
The DCM9040 Battery Monitor The unit is designed to monitor performance most kind of battery systems, it continuously monitors voltage, discharge current, number of power, consumed amp hours, these information leads to more efficient use of the battery, which can enhance battery life and reduce the risk of failure. Combines many functions in one, Dual display. *Voltage (V), Power (W), Current (A)…
|Stalwart 75-99500 Digital Clamp Electronic Volt Amp Meter Kit
The perfect tool for electricians, technicians, servicemen and hobbyists who require an instrument that is accurate, reliable and always ready for use. This Digital Clamp meter is powered by a standard 9V transistor radio type battery, providing 150-200 operating hours for your convenience. It has rugged structure design and a comfort grip….
|P3 P4400 Kill A Watt Electricity Usage Monitor Empowers You to Save Hundreds on Electric Bills Electricity bills are rising. Now you can cut down on costs and find out what appliances are actually worth keeping plugged in. Simply connect these appliances to the Kill A Watt, and it will assess how efficient they really are. The large LCD display counts consumption by the kilowatt-hour, the same as your local utility. You can calculate your elec…|
|12 Volt 7 Amp Hour Sealed Lead Acid Battery (12v7ah , 12v 7ah , 12 V 7 Ah) Replacement
Interstate Batteries Power Patrol Lead Acid Battery, 12V 7Ah (SEC1075) Replacement…
|vanki 1 pc 0.28”LED DC0-100V 10A Digital voltmeter Ammeter 2in1 Multimeter 12V/24V Voltage Amperage Meter Volt Amp Gauge Panel with Red/Blue Dual Color Display
About us (vanki), Professional factory, welcome to our store for more choices with best price. What we pursue is your satisfication of our service, not just for our goods.For any reason you are unsatisfied with our product at any time, simply contact support for exchange or refund. we will reply you about any question you ask within 24 hours Specifications : Dimensions: 48 * 29 * 21mm Measurin…
|Dr.Meter Backlit Accurate Digital Multimeter Volt Amp Ohm Meter Diode Continuity Capacitance Resistance hFE Test, Red
Dr.Meter Our Dr.Meter MS88 digital multimeter is a safe and convenient handy measuring tool for anyone who needs to measure AC/DC voltage, current, frequency, resistance, capacitance, diode, transistor etc. The new NCV (Non Contact Voltage Detection) is a great feature that let you know any voltage over 110V AC (RMS) without touch the wire. No matter you are a professional electrician or just a DI…
|Searon Agrigarden Machine Tachometer Hour Meter Voltmeter for Tractor Cultivator ATV Trailer Sprayer Compressor Robot Milking Trimming
Product Name: Digital Hour Meter and Tachometer with Voltmeter 3 in 1. Digital Multifunction Tach Hour Meter with Voltmeter. It can work on any 2 or 4 stroke gas engine up to 8 cylinders.It has a powerful timing system, RPM measuring system,voltage system as well as some other unique function design. Timing System Including: Accumulating total running hours TOT, recording partial running time TMR…
|Schumacher SC-1200A-CA SpeedCharge 12Amp 6/12V Fully Automatic Battery Charger
This is a 6V/12V 12 Amp fully automatic microprocessor controlled battery charger for premium charging applications. With 6V/12V auto voltage detection, this charger can do 3 Amp for maintaining, 6 Amp for medium charging and 12 Amp rapid charging, with a digital display. Also has reverse hook-up protection so the unit will not operate if clamps are reversed, and float mode monitoring. Energy effi…
|NOCO Genius UltraSafe Smart Battery Charger