I apologise if this has already been covered somewhere else!
240 to 260-watt panels
are cheaper than the smaller panels
watt for $, largely because they are the industry standard size for putting on house roofs. The problem is that the output voltage of these panels tends to be in excess of about 25V, which is what the majority of charge regulators for smaller solar
arrays are rated to. For open-circuit panel voltages greater than this there are much larger controllers available but they really are MUCH larger (eg. morningstar's 'tristar' controller, which goes up to 150Voc and 45 amps max current) and are correspondingly more expensive. Does anyone know of a decent MPPT
charge controller that has a max input voltage of 40 to 50 volts and a max current
of around 30 or so? It seems like such a controller would be quite popular for the marine
market. In fact, Blue Sky will shortly be coming out with a 3000i model that satisfies this gap in the market, but it's not available until around August and in the meantime i need power! Am i missing something?