Solar Safety & Installation

There is a $15 disconnect switch on a popular online marketplace with 400 reviews and a 4.5 star rating. It is rated 250V AC 100A. It has no DC voltage rating on the listing. Somebody put it on a 48V off-grid system. Under load the contacts welded. The switch would not open. The system could

3:00 AM. January. Rockwood. The furnace blower kicks on. The inverter sees the surge. The battery voltage sags. The system hits Low Voltage Cutoff. The cabin goes dark and cold in the same second. Inverter sizing for off-grid is not a summer calculation it is a winter survival calculation. The inverter that handled everything fine

In 20 years of automotive service I have seen what happens when a battery terminal vibrates loose. In a car the engine will not start. In a 48V off-grid system pulling 300 amps a loose nut is not an inconvenience it is a heating element. A busbar torque spec is not a suggestion from the

A popular YouTube host holds up a soldered battery terminal and calls it “beautiful totally pro.” It does look impressive. Shiny. Neat. But here is the catch it will fail when you need it most. A -30°C January in Rockwood. The solder becomes brittle. Under constant vibration from a running inverter stress fractures develop at

A client called me two years after his DIY solar install in Rockwood. Brown water stain on the ceiling directly under the array. He had used two full tubes of silicone around every solar roof mount. I got on the roof and found the problem immediately every mount was bolted through OSB decking between the

A client called me the morning after a July thunderstorm in Rockwood. The strike had not hit his cabin it hit a tree 80 metres away. His Cerbo GX was dead. His SmartSolar MPPT 100/50 had a Fatal Error light and would not reset. His MultiPlus-II was clicking on startup. Total damage: $1,330 from a

A 1200W array producing 180W at noon on a clear day. Four 300W panels wired in series one long daisy chain. Four inches of snow on the bottom edge of the lowest panel barely covering the junction box. That partial shadow drops the entire series string to near-zero. Solar panels series vs parallel is the

A 1200W array producing 400W on a clear noon day. You climb on the roof. You find it in three minutes. One mc4 connector solar failure on the positive leg of the first panel melted into a black glob plastic housing partially fused to the adjacent cable jacket. The homeowner saved $15 on a bag

A 4/0 cable runs straight from the battery to the inverter. No switch. To swap a fuse the owner has to work on a live system touching terminals connected directly to a battery capable of 15,000A fault current. Every time he cleans a busbar connection he is working on a loaded gun. A dc disconnect

You open a battery box built three years ago. The copper lugs are covered in thick green fuzz. The cable jacket feels crunchy where it enters the lug barrel. That green crust is copper oxide a corrosion product with resistance hundreds of times higher than bare copper. It is strangling the power flow at every