Polishing up my Solar System
So I currently have 300w(2 each 150w panels), a Samlex 30a Controller. It feeds 4ea. 6v batteries in series and paralleled. My rig came prewired for Solar. It has the Samlex panels and the Samlex w...
Forum Discussion
The controller now has a 30a (based on panel Isc) rating but--this is the good part--it has overload protection, which is not common with PWM.
450w would get you about 28 amps (Isc) aimed at high sun, but you will have yours flat so expect fewer max amps. The overload protection means you don't need the usual margin for going over the panel rating at times.
There is nothing wrong with that controller and three 150w 12v panels in parallel, flat on the roof. You cannot go series--note the 50Voc limit, normal with PWMs. Not much to be gained with MPPT anyway in real life, and you already have bags of solar at 450w for two batteries. You don't need even more.
You will not gain anything worthwhile moving the controller a little closer to the batteries, waste of effort IMO. Just cause trouble with the panel to controller wiring as you said.
I agree the best idea is do nothing but add the third panel, keep the wiring as is, and see how it goes. You can always change it later if you really want to.
450w would get you about 28 amps (Isc) aimed at high sun, but you will have yours flat so expect fewer max amps. The overload protection means you don't need the usual margin for going over the panel rating at times.
There is nothing wrong with that controller and three 150w 12v panels in parallel, flat on the roof. You cannot go series--note the 50Voc limit, normal with PWMs. Not much to be gained with MPPT anyway in real life, and you already have bags of solar at 450w for two batteries. You don't need even more.
You will not gain anything worthwhile moving the controller a little closer to the batteries, waste of effort IMO. Just cause trouble with the panel to controller wiring as you said.
I agree the best idea is do nothing but add the third panel, keep the wiring as is, and see how it goes. You can always change it later if you really want to.
