Written by Lisa Walsh

Solar Monitoring

Homeowners can see how their daily sunshine dollar is spent

Most homeowners who have invested a tidy 20 – 30K in a whole-house solar electric system want some idea of exactly how much, and when, their solar system is generating energy. This is true especially given the fact that most solar systems in Maryland, DC, Virginia and surrounding area are grid-tied. The solar electric system provides a large portion, though generally not ALL of a home’s electricity, with the balance coming from the traditional energy provider (BGE, PEPCO, etc.) during periods of high usage and/or low sunshine levels. So most customers still receive an electric bill, albeit greatly reduced. An online solar monitoring system keeps the homeowner plugged in to how much energy they are receiving from the sun versus their utility “back-up”.

The monitoring system is tied to the Inverter… (An inverter, by the way, converts DC power to usable AC power.)

SES often uses Enphase Microinverters in residential solar electric systems. This is our preferred monitoring system for a variety of reasons, including simplicity, cost-effectiveness, and customer support. With this system, each panel has its own inverter and associated monitoring. In contrast, solar systems that use only one inverter for the whole array do not have the ability to monitor performance of individual panels; just the entire as a whole. Microinverters, convert, quantify, and record the DC to AC energy conversion on each individual panel, independent of the other panels. These microinverters come with the Envoy Enlighten monitoring system. The homeowner simply clicks on a link from on their computer or Smartphone to see live readout of their current system power generation along with a robust record of historical data. Both the homeowner and system installer are notified when Enphase detects issues such as a panel or inverter failure (a rare occurrence), communication issues or shading (due to tree growth etc.), enabling a speedy remediation. Fortunately, true solar panel/inverter issues are few and far between, if at all, keeping the monitoring system employed at its optimum job: counting the rays of sunshine that power your home.

Commercial Solar Energy ,Residential Solar Panels ,Solar Service
Written by Lisa Walsh

Solar Energy Costs Likely to Rise

The solar clock is ticking – don’t wait for solar energy costs to come down

Commercial Solar Energy, Residential Solar Panels ,Solar ServiceThe installed cost of a solar electric system has come down dramatically in the past several years – by 50% in most cases. However, homeowners considering investing in solar would do well to act sooner rather than later. Declining financial incentives and the threat of increasing panels costs (due to US tariffs on chinese solar panels), mean that the cost of solar energy could start to go up very soon.

SOLAR ELECTRIC (PV)

Whole house solar electric systems are being installed every day in Maryland. The system can be sized to offset some or most of a home’s electricity bill and are grid-tied; the homeowner’s utility-provided energy is still readily available for them in times of no-sun. Also, when there is more sun than needed – the extra energy serves to turn the homeowner’s meter “backwards” – crediting their utility account. Current grants and tax credits, coupled with unprecedented low solar panels costs, means that most of the solar electric systems currently installed pay for themselves in around six years and are warrantied for 20 to 30 years. That’s 20 to 30 years of ZERO rate increase.

TYPICAL 5kW SOLAR ELECTRIC SYSTEM

  • Estimated System Cost $21,000
  • Federal Tax Credit $6,300
  • MD State Grant $1,000
  • AA County Property Tax Credit @ 75% $1,875
  • SREC Payments* $6,700
  • Total Incentives $15,875
  • Net Cost to Homeowner $5,125
  • Payback in Years 5 – 7yrs
  • 25yr Annual Energy Savings +$800 per year

SOLAR WATER HEATERS (thermal)

The solar panels used to heat a home’s water for laundry, showers etc. are entirely different from those used to provide electricity. They require much less space and are substantially less expensive. A solar water heater sized for a family of four provides 75% of the home’s annual hot water load and CAN PAY for itself in around 3 years.

Again, this is a system slated to last 20 to 30 years. Gas or electric is used as a back-up system.

TYPICAL 4-PERSON SOLAR WATER HEATING SYSTEM

  • Estimated System Cost $9,000
  • Federal Tax Credit $2,700
  • MD State Grant $ 500
  • AA County Property Tax Credit @ 75% $1,875
  • SREC Payments* $3,200
  • Total Incentives $8,275
  • Net Cost to Homeowner $725
  • Payback in Years 1 – 4 yrs
  • 25yr Annual Energy Savings +$400 per year