"You cant use a 36cell panel on a 12v mppt controller..." says one forum user
You cant use a 36cell panel on a 12v mppt controller...
Post # 17 in thread titled My first off grip solar power system questions
The thing you have to realise is that mppt isnt magic. It introduces ineffciencys of its own, the internal buck converter is only ever going to be 90% effcient, and this combined with higher tare loss reduces the gain they get from your average panel to battery voltage differential. Also MPPT controllers need quite a bit of voltage headroom. You cant use a 36cell panel on a 12v mppt controller, you need something like twice the battery voltage to give it some room to down convert.
Since user zoneblue has not responded for two days, could someone else explain?
I ask, because I seem to be using, successfully, one or two (depending on cloud cover) 36-cell PV panels and a Morningstar SunSaver MPPT 15L to properly charge (according to the battery manufacturer's recommended charge profile) a 100 amp hour AGM battery.