Step Down Transformer

System

My question relates to the minimization of line losses. I am installing a 10 kW ground mounted solar system in Ontario in a grid-tied application. I know that my inverter is available in both 240 V and 600 V output configurations. Would there be economic benefit in utilizing the higher voltage and providing a step down transformer to nominal 240 V at the point of connection to the meter, in order to reduce line losses for cable distances of 400 ft, assuming a 4 AWG aluminum conductor? Or could the cost more reasonably be spent in going to a 2 AWG aluminum conductor or copper? I have not been able to find reliable pricing on the step down transformer, so don’t have enough data to answer this question myself.

mike95490

Re: Step Down Transformer

For long distance, I would perfer the high voltage and transformers, gives a little bit of isolation. Look for transformers on ebay, or maybe your utility has some.

BB.

Re: Step Down Transformer

That may or may not be a good solution... Transformers can have upwards of ~5% losses... So you well end up with more losses with the transformer than without.

I would probably go with the larger gauge cable--but, as we say, run the numbers for both setups (plus research transformer losses both under power and idling) and see what works out best.

-Bill

stephendv

Re: Step Down Transformer

Couldn't you move the inverter itself close to the meter, so that you run high voltage DC to the inverter, then only a short run for 240AC?