When an EV charger, older 100-amp panel, and possible future solar are part of the same project discussion, the present loads and documented future design inputs belong in one calculation.
Key Takeaways
- We run a load calculation before promising a charger on 100-amp service.
- Options can include a lower EVSE setting, listed load management, or a 200-amp upgrade at $3,500–$7,500.
- Solar-ready means reserved backfeed space after the charger lands — not modules on the roof.
What we check first
Existing demand, main size, bus rating, breaker space, the configured charger output, and whether a future backfeed still fits. A lower charge rate can keep a small service legal. It does not invent busbar capacity for generation.
Ready to Install a Home EV Charger?
Our licensed electricians evaluate panel capacity, circuit routing, equipment requirements, and permit needs for home EV charging. Call (571) 444-6886 or request an estimate online.
When the 200-amp upgrade is the honest answer
If the charger, HVAC, and documented solar design inputs do not fit the existing service, the proposal can separate panel work from the EV circuit. That defines current responsibility without promising that future equipment, permit, utility, or code requirements will remain unchanged.
See panel upgrades and Level 2 EV charging.
