If it is proceed.
Do solar panels put out very little amperage.
The second fuse between your solar panels and charge controller is a little bit different to figure out.
Measure the solar panel controller output voltage try to get maximum voltage by angling the panels.
Ask someone who knows and they should tell you that for a small setup like 150watt system a mppt is a waste of your money.
Standard temp and conditions stc is how panels are rated.
Hopefully it is less than the solar panel controller output voltage.
Solar panels usually range in wattage output from around 250 watts to 400 watts but some panels exceed the 400 watt mark.
Measure the battery voltage.
The size of this fuse is dependent on how many solar panels you have and how they are connected series parallel or series parallel.
The top panel in the e series comes out at a whopping 435 watts.
A panel can only put out so many amps so while the voltage is reduced from say 33 volts to 13 6 volts the amps from the panel cannot go higher than the rated amps so with a 175 watt panel rated at 23 volts 7 6 amps you will only get 7 6 amps 12 volts or so into the battery.
I had the exact panel op did and in direct summer sun the highest i measured off the back of the panel was just over 7 amps.
This information can be found from the solar panel manufacturers data sheet please see example here.
Solar panel voc at stc.
To ensure that you don t blow your device s fuse set the maximum amperage sensitivity to well above your expected reading.
Not a very good chance at a 150watt panel putting out 10a.
To test solar panel amperage output put your solar panel in direct sunlight set your multi meter to the dc amps setting.
For example if the solar panel is rated at 175 watts and the maximum power voltage vmp is given as 23 6 volts then calculate the current as 175 watts divided by 23 6 volts which is equal to.
Rarely do you achieve stc output because in the hot sun the panels heat up and their output is reduced to normal operating cell temperature noct output.
If the panels are connected in series the voltage of each panel is added but the amperage stays the same.
This is the open circuit voltage the solar panel will produce at stc or standard test conditions stc conditions are the electrical characteristics of the solar panel at airmass of am1 5 irradiance of 1000w m 2 and cell temperature of 25 o c.
In order to benefit from the cold temperatures which raise vmp you will need an mppt controller.
