GridWright

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Solar & Battery

Size your off-grid solar system. Accounts for depth of discharge, inverter efficiency, and controller type.

Core calculators

Battery Runtime

How long will my battery last?

Solar Charge Time

How long to charge with solar?

Battery Bank Sizing

How much capacity do I need?

Solar Panel Output

Daily output from my panels

LiFePO4 Voltage Chart

State of charge reference

Ah to Wh Converter

Convert between units

Battery runtime by capacity

Pre-calculated examples for common battery sizes

50Ah100Ah200Ah280Ah300Ah400Ah

Panel output by wattage

Daily yield and charge times for common panels

100W200W400W600W800W

Appliance runtime by battery size

How long will specific appliances run on different batteries?

CPAP Machine on 50Ah

13 hours typical runtime

CPAP Machine on 100Ah

27 hours typical runtime

CPAP Machine on 200Ah

54 hours typical runtime

Oxygen Concentrator on 200Ah

4.5 hours typical runtime

Oxygen Concentrator on 300Ah

6.8 hours typical runtime

Oxygen Concentrator on 400Ah

9 hours typical runtime

Mini Fridge on 100Ah

24 hours typical runtime

Mini Fridge on 200Ah

48 hours typical runtime

Chest Freezer on 200Ah

30 hours typical runtime

Chest Freezer on 300Ah

45 hours typical runtime

Well Pump on 300Ah

4 hours typical runtime

Well Pump on 400Ah

5.5 hours typical runtime

How many solar panels for...

Panel sizing guides for appliances, system sizes, and use cases