The solar panel with the highest watt is the sunpower e series a commercial solar panel line.
Do solar panels put out very little amperage.
Measure the battery voltage.
In order to benefit from the cold temperatures which raise vmp you will need an mppt controller.
To test solar panel amperage output put your solar panel in direct sunlight set your multi meter to the dc amps setting.
It may be that you can never get more than 12 13v.
If the panels are connected in series the voltage of each panel is added but the amperage stays the same.
Not a very good chance at a 150watt panel putting out 10a.
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.
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.
This information can be found from the solar panel manufacturers data sheet please see example here.
Standard temp and conditions stc is how panels are rated.
The second fuse between your solar panels and charge controller is a little bit different to figure out.
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.
Solar panels usually range in wattage output from around 250 watts to 400 watts but some panels exceed the 400 watt mark.
Solar panel voc at stc.
If it is proceed.
Connect the ve solar controller output lead to the ve.
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.
To ensure that you don t blow your device s fuse set the maximum amperage sensitivity to well above your expected reading.
Measure the solar panel controller output voltage try to get maximum voltage by angling the panels.
Hopefully it is less than the solar panel controller output voltage.
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.
