Volt Amp Hour

Volt Amp Hour
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

Power Meter Energy Watt Voltage Amps Electricity Usage Monitor with Overload Protection, LCD display,Reduce Your Energy Costs
Power Meter Energy Watt Voltage Amps Electricity Usage Monitor with Overload Protection, LCD display,Reduce Your Energy Costs
$17.99
Help You to Save Hundreds on Electric Bills: ★ With this energy meter, you can monitor which appliances are the killer of the high cost of energy. And you can see which appliances are the actual one that worth keeping plugged in.Saves energy by automatically turning on and off lamps, Christmas tree lights, fans, and other electrical devices. ★ Just connect your device on the energy meter and i…

AILI® DC Programmable Meter Controller 0-200V 0-400A Volt Amp Power Ah Auto Shut Down Car Motor Boat Motorhome Solar Wind HHO Power
AILI® DC Programmable Meter Controller 0-200V 0-400A Volt Amp Power Ah Auto Shut Down Car Motor Boat Motorhome Solar Wind HHO Power
$27.00
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)…
Nicky's Gift Digital 60V 100A Balance Voltage Battery Power Analyzer RC Watt Meter Checker
Nicky’s Gift Digital 60V 100A Balance Voltage Battery Power Analyzer RC Watt Meter Checker
$10.55
100% brand new and high quality
Digital LCD screen gives clear crisp number readings.
Handles up to 100 amps intermittently and 50 amps continuous duty.
Connecting load end to the battery provides real-time battery charging reading.
Handles 0 to 60 volts. Works on 12, 24, 36, and 48 volt battery bank systems.
Extremely low power consumption of 7 mA. More efficient than any LED meter.
M…

P3 P4400 Kill A Watt Electricity Usage Monitor
P3 P4400 Kill A Watt Electricity Usage Monitor
$18.99
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…
Searon Agrigarden Machine Tachometer Hour Meter Voltmeter for Tractor Cultivator ATV Trailer Sprayer Compressor Robot Milking Trimming
Searon Agrigarden Machine Tachometer Hour Meter Voltmeter for Tractor Cultivator ATV Trailer Sprayer Compressor Robot Milking Trimming
$39.99
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…
DC6.5~100V 20A 4 in 1 LCD Digital Combo Panel Meter Volt Amp Power Watt Hour with Shunt 20A
DC6.5~100V 20A 4 in 1 LCD Digital Combo Panel Meter Volt Amp Power Watt Hour with Shunt 20A
$9.99
Main Specifications: Working voltage: DC 6.5 ~ 100V Measuring:Accuracy: 1% Power Consumption: 0.2W Measurement speed: 2 times/s Store Energy data when power off. Can be reset to 0. The blue backlight can be turned on/off manually Test Range and Display format: 1.Active Power test range: 0~10kW 2.Energy test range: 0~9999kWh 3.Voltage test range: DC 6.5~100V 4.Current test range: 0~ 2…
ExpertPower 12V 7 Amp EXP1270 Rechargeable Lead Acid Battery
ExpertPower 12V 7 Amp EXP1270 Rechargeable Lead Acid Battery
$15.75
ExpertPower Sealed Lead Acid Batteries are made with the highest quality of materials available. Our Lead Acid Batteries are typically used for: Home Alarm Systems, Uninterruptible Power Supply(UPS), Lighting Equipment, General Electronics, Home Security Systems, Emergency Systems, Medical Devices, Electric Scooters, Solar Collectors, Wheelchairs and many Other Applications. Whether it’s the SECUR…
ExpertPower EXP1250  12V 5Ah Home Alarm Battery with F1 Terminals
ExpertPower EXP1250 12V 5Ah Home Alarm Battery with F1 Terminals
$15.99
ExpertPower Sealed Lead Acid Batteries : Used for Alarms, Uninterruptible Power Supply(UPS), Lighting Equipment, General Electronics, Emergency Systems, Medical Devices, Electric Scooters, Solar Collectors, Wheelchairs and many other applications….