Life used to be so simple.
Do solar panel need to match the controller.
For example if you have a 100 amp hour battery and a 10 watt panel you take 100 and divide it by 6 600ma and you get 166 6.
In some rare cases a solar panel can be connected directly to a battery without a controller.
This means if your battery is full it stops the charging and if your battery is reaching an unhealthy.
This can be achieved if the nominal voltage of the panel is lower than 17 18v and if the solar panel is a lot smaller than the charging battery e g.
Again this is not chock full like unregulated solar can do just full enough to stop pushing them at absorption levels and switch to a float voltage.
Unfortunately due to the fact that with pwm controllers the pv module is not feeding the battery from its maximum power point mpp the system loses a lot of energy.
The safest way to figure out if you need a charge controller is to take battery amp hour capacity and divide this by the solar panel max.
You connect solar panels in series when you want to get a higher voltage.
You don t need a charge controller with small 1 to 5 watt panels.
A 10w panel charging a 100ah battery.
If the quotient is above 200 you don t need a controller.
Solar charge controller functions.
How does the charge controller work.
If you have your solar panels wired in series like i recommend you could possibly have over 100 volts coming out of the solar panels if you connected your 100 volts from the solar panels directly to the battery it s not going to work.
There are two main types of connecting solar panels in series or in parallel.
There are many different types of controllers on the market.
Solar panels typically put out a voltage that is too high for batteries to use.
Do i always need a solar charge controller.
A solar charge controller is designed to receive power from a solar panel or array of panels and use it to charge a battery or bank of batteries.
The function of a charge controller is to regulate the charge going into your battery bank from your solar panel array and prevent overcharging and reverse current flow at night.
Matching solar modules to mppt charge controllers.
It does this by using a transistor to shunt the pv charging circuit.
First between the charge controller and battery bank second between the charge controller and solar panels and third would be between the battery bank and inverter to determine the fuse size needed between the charge controller and battery bank you simply match the amperage rating on the charge controller.
The charge process is performed in a smart or intelligent way.
If a panel puts out 2 watts or less for each 50 battery amp hours you probably don t need a charge controller.
The solar power you want to generate the other system components such as a charge controller battery and inverter.
Different types of solar charge controllers.
There are three different locations that we recommend installing fuses or breakers.
Anything beyond that and you do.
