A question that often comes up is.
10 watt solar panel needs controller.
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.
This means if your battery is full it stops the charging and if your battery is reaching an unhealthy.
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.
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If the number is less than 200 than you need a controller.
All solar panels need a charge controller.
It does this by using a transistor to shunt the pv charging circuit.
You don t need a charge controller with small 1 to 5 watt panels.
Solar charge controller functions.
Without one you can overcharge and damage the battery.
Do i need a solar charge controller for a 10 watt solar panel.
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If a panel puts out 2 watts or less for each 50 battery amp hours you probably don t need a charge controller.
Anything beyond that and you do.
Okay you get the idea it s just simple math.
The general rule is that you don t need a solar charge controller if the solar panel puts out about 2 watts or less per 50 amp hours of battery power.
If the quotient is above 200 you don t need a controller.
Note that the most common solar pv charge controllers come in 12 24 and 48 volts.
10 x 300 watt solar panels in series 3000 watts 48 vdc battery bank 25 78 amps.