BackFortyPower.com · Load-First Planning

Off-Grid Load Calculator For Better Power Planning.

Estimate how much power your cabin, RV, homestead, workshop, or backup system needs before buying solar panels, batteries, inverters, wind turbines, portable power stations, or complete off-grid kits.

Start The Worksheet See Example Calculation

Estimate Daily Watt-Hours

Identify Running Loads And Surge Loads

Plan Batteries, Solar, Inverters And Backup

Core Formula

The First Question Is Not Which Kit To Buy. It Is What Do You Need To Run?

Your daily energy use determines battery size, solar array size, inverter size, generator backup needs, and whether a portable power station is realistic.

Basic Load Formula

Watts × Hours Per Day = Watt-Hours Per Day

1
List Every Appliance, Device, Pump, Tool, Charger, And Critical Load.
2
Estimate Running Watts And Daily Runtime For Each Item.
3
Identify Surge Loads From Motors, Compressors, Pumps, And Power Tools.
4
Use The Total To Plan Batteries, Solar, Inverter Capacity, And Backup Power.

Best Practice: Build the load plan first, then compare equipment. That single step helps prevent undersized systems, oversized purchases, and unrealistic expectations.