The team from Integrated Building Systems were very professional in their installation of both a solar photovoltaic array and a critical load panel that is powered via a battery backup system (automatically tapped during power outages). Darren is a hands-on owner, and was on site for most of the work. He sought out and was very receptive to my input, working with me to choose the best locations for all of the required hardware, taking into account efficiency, convenience, and aesthetics. As with many electrical projects, there was some need to cut holes that required repairs (in our case, in the drywall behind the existing electric supply, to route the solar output down to the meter location), but they were careful to align with the studs, and make precise, square cuts, which made it easier for us to patch and repair. Darren provided a detailed proposal which made it easy to evaluate the bid, and also provided all the required technical information for us to apply for necessary building and zoning permits (this will be specific to your locale). Darren was available (if needed, at an hourly rate) to attend the village meetings during our application process, but we were able to make the necessary presentations without him. ===> In summary, I am very happy with the flexible design of our solution and the resulting installation, and very satisfied with Darren and his team. I highly recommend Integrated Building Systems for your solar project and electrical project needs. <==== More project details follow: our system consists of 24 LG PV panels connected to Iron Ridge racking (3 panels high by 8 wide) sited on our south-facing roof, with an Enphase micro-inverter attached to each panel; these inverter outputs are combined in an attic-installed Enphase IQ Combiner and Envoy. Via the Envoy, our solar production can be monitored via web and smartphone apps. The solar system is grid-connected, and per utility requirements, a "sell" meter and solar panel cutoff were installed near our existing "buy" electric meter. The battery-backup system requires a charger and inverter (we have Magnum equipment to handle battery charging, inverter capabilities, automatic load switching, and battery monitoring). Our 8 rack-installed batteries provide upwards of 1400 (rated) amp hours supporting only a portion of our home circuits; depending upon our energy usage, we estimate perhaps 3 days of usage (in the absence of solar production) with longer duration backup during an outage depending on our ongoing energy consumption, as well as some sunny weather to recharge the batteries. NOTE - it is not necessary to install a battery-backup with a solar PV array. However - perhaps counter intuitively - a grid-connected solar system will not produce power during a power outage. (Grid-connected systems must be designed to automatically stop energy production when the grid is down). In order to produce solar power during a grid outage, you must have an independent source of power (to "trick" the electronics in the micro-inverters, allowing solar power to be produced), along with automatic transfer switches to the alternate power source and to cutoff the new source of power from the grid. Alternate power could be provided by a stand-by generator, or, as we chose, a battery backup. This backup can feed circuits in a critical load panel that is switched between the normal state (grid and/or solar) and outage state (batteries and/or solar). Suggested critical load circuits include those for furnaces, sump-pumps, refrigerators, freezers, microwave, selected light and outlet circuits - including circuits for a TV, radio, computer, and internet router, etc.