How many solar panels to run a mini split?
About 5 panels at 400 watts under national-average sun, working from 6 kWh a day. The count runs from 3 in desert sun to 5 in the cloudiest states. That answers the energy question; the timing question (this load at night, panels at noon) is the part most listicles skip, so it gets its own section below.
Panels by sun figure
400W panels, 0.77 derate, count rounded up; the right column shows what the rounded-up count actually produces against the load's 6 kWh day.
| Peak sun hours | Panels | Daily margin |
|---|---|---|
| 4.0 h | 5 | ~6.2 kWh vs 6 needed |
| 4.5 h (US avg) | 5 | ~6.9 kWh vs 6 needed |
| 5.0 h | 4 | ~6.2 kWh vs 6 needed |
| 5.5 h | 4 | ~6.8 kWh vs 6 needed |
| 6.0 h | 4 | ~7.4 kWh vs 6 needed |
| 6.5 h | 3 | ~6 kWh vs 6 needed |
Where the 6 kWh figure comes from. A 12,000 BTU mini split at SEER2 20-plus averages 600 to 900W while cooling. At 8 effective summer hours that is 5 to 7 kWh a day; we plan at 6.0. Heating in shoulder seasons runs similar, deep-winter heating runs more.
The part after the panel count
Five panels at average sun, four in the Sun Belt. The mini split earns its reputation in this table: it moves the same heat as the window unit on this site for barely more energy while being a whole-room-quieter machine, and inverter-driven compressors ramp instead of slamming on, so there's no start-up surge to terrorize an off-grid inverter. This is why mini split plus modest solar is the standard play for conditioned workshops, ADUs, and van-life build-outs.
The number that breaks the estimate is winter heating. A mini split heating through a northern January can draw its summer daily figure twice over, exactly when peak sun hours bottom out; that mismatch, not the summer math, is what sizes off-grid heat pump systems. Our off-grid guide walks the December design month.
Questions people ask
How many solar panels does it take to run a mini split?
About 5 400-watt panels at the national-average 4.5 peak sun hours, from a planning figure of 6 kWh a day. Strong desert sun brings it to 3; cloudy states need 5. Those counts cover daily energy; running the load at night takes a battery or a grid connection, covered below.
Do mini splits have a start-up surge like other AC?
No meaningful one. Inverter-driven compressors ramp up from soft-start instead of jumping to full draw, so surge sizing (the thing that dominates window-AC and well-pump projects) barely applies. Size for the running watts and the duty cycle and you are done.
Does this count include a battery?
No. The table answers the energy question: how many panels produce what the load consumes over a day. Grid-tied homes need nothing else; the grid absorbs the timing. Off-grid, add storage for the dark hours (the page discusses sizing for this load) and an inverter rated for the start-up surge where the load has one.