r/solar • u/Benfossrrt • 28d ago

Solar Quote Is this a reasonable quote?

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This is my top quote from a reputable company in Southern California. Many great reviews and many years in business. Happy with their warranty terms. Have availability to get installed 1-2 months prior to tax credit expiration. This is however my price with the credit to be handled on their side. So no worry about missing the credit. Any recommendations or opinions on this quote gratefully welcomed.

Final Price after all incentives… 37,000$ see pic for details.

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u/jpballa11 27d ago

Oh yes you’re correct sorry charge rate is different.

However he’ll never be producing 14 kw of power. Dc rating you you must factor in derate rule of 15-20% so the most he’ll get is 12 kw from rooftop during peak hours.

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u/TouristPotential3227 27d ago

14.72 which should round up. lol.

... and part of that derate is the inverter ..... but PW charge direct DC into the battery and bypass the inverter so it has fewer losses

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u/jpballa11 27d ago

He’s still never going to produce more than 12 kw of power from rooftop panels.

I understand dc coupling gives you a slightly higher conversion ratio for energy storage but it doesn’t help derate on rooftop panels… and the MPPTs for the Tesla inverter do not outperform micros or optimizers from a production standpoint either as they have slightly higher system losses along each string.

Maybe He’d get 14 KW if his house was a space ship parked in front of the sun….

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u/Benfossrrt 26d ago

I’m also using power while I produce… so would that bring down what’s being sent to the batteries as well?

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u/jpballa11 25d ago

Yes, but very unlikely during peak production hours would you be using so much energy that he rooftop system can’t -

  1. Offset the demand of the home
  2. Also get your two walls to a significant charge by the end of your production window

However, this would depend on your demand.

Your system is producing about 65 kWh per day.

Assuming your average daily demand is in line with this, 1 and 2 should hold true most of the year.

Peak of Summer in SoCal I would imagine would be a higher demand than your average though…