Affiliate disclosure: This article contains affiliate links. If you buy through them, SolarHomeCompare may earn a commission at no extra cost to you.
Late on June 29, 2012, a derecho swept across Maryland almost without warning, dropping trees onto BGE and Pepco lines from Baltimore through the Washington suburbs and cutting power to homes across the region — just as a punishing heat wave took hold. For days, families in Annapolis, Silver Spring, and Bethesda had no air conditioning while the thermometer sat in the upper 90s. Maryland runs on the PJM regional grid, but PJM only coordinates the high-voltage backbone; when straight-line winds snap the local pole feeding your street, the regional grid can’t cool a single room for you. Backup can. If you’re comparing Maryland solar quotes, it’s worth knowing a grid-tied rooftop array won’t help either — it shuts off with the grid.
In a Maryland summer, the danger is the heat, not the dark
The 2012 derecho is the case study, but the pattern repeats: fast summer storms, tropical remnants tracking up the Chesapeake, and the odd winter system all knock out power across BGE territory around Baltimore, Pepco around the D.C. line, and Potomac Edison to the west. What makes a Maryland outage dangerous is timing — a July blackout without AC is a heat-safety problem for older residents and anyone with health conditions, long before the food in the fridge starts to turn. That’s the load to plan around first.
Why your panels can’t cool the house
It catches homeowners off guard: a rooftop system stops producing the moment the grid goes down. Anti-islanding protection forces it to, so line workers aren’t exposed to power your array is pushing back onto dead wires. So on the blazing afternoon after a derecho, your panels sit idle while the house heats up. Only a battery lets you run your own power through the outage.
For the essentials — a fridge (about 150W), lights (ten LED bulbs near 50W), Wi-Fi (about 10W), phones (about 20W), and a fan — you’re near 300W of steady draw. The Solar Generator HomePower 3000 (about 3,072Wh, 3,600W) carries that for one to two days and ships with solar panels that recharge it each sunny day the grid stays down.
▶ See the HomePower 3000 solar generator use code DEAL5
If keeping cool is non-negotiable, size up. The Solar Generator 5000 Plus delivers 5,040Wh and 7,200W with 120V and 240V and expands to 60kWh — enough to run central AC alongside the rest of the house through a multi-day July outage.
▶ View the Solar Generator 5000 Plus
Why Marylanders traded the gas generator for a battery
After 2012, plenty of households bought gas generators — then found them loud, thirsty for fuel that ran short, and unsafe to run near a shut-up house in the heat. A Jackery LiFePO4 station sidesteps all of it: sealed and zero-emission, safe indoors, and quiet at around 30 decibels. Charge it before storm season and it’s staged and ready. It’s worth checking the current deals before you buy.
Keep reading: Maryland solar incentives & costs · How to keep the lights on in a Virginia outage · Do Delaware homes need solar battery backup?