Running a 3D printer on solar, a battery or an inverter

Yes. A desktop 3D printer runs on solar power through a battery and an inverter, as long as the inverter’s continuous rating covers the printer’s maximum draw: about 350 W for most full-size desktop machines. A 3-hour PLA print on a Bambu Lab A1 mini takes about 280 Wh from the battery. An 8-hour ABS print on a P1S takes about 1,320 Wh.

Can you run a 3D printer on solar power?

Yes. Solar panels charge a battery, and an inverter turns the battery’s DC into the 120 V AC the printer plugs into. Size the inverter to the printer’s maximum watts, the battery to average watts times print hours, and the panels to refill that battery each day. A 350 W pure sine wave inverter covers most desktop printers.

Rooftop solar tied to the grid needs nothing extra: the printer plugs into a normal outlet. The sizing below is for an off-grid setup, or for printing through a power outage.

How many solar panel watts do you need?

Divide the energy you put into the battery each day by your peak sun hours, then by 0.86 for panel-side losses:

panel watts = Wh into battery per day ÷ (peak sun hours × 0.86)
Wh into battery = Wh drawn from battery ÷ 0.95   (LiFePO4 round trip)

Peak sun hours are the day’s solar radiation in kWh per m², counted as hours of full 1,000 W/m² sun. The 0.86 is the 14 percent default system loss in PVWatts, the solar model run by the National Laboratory of the Rockies (formerly the National Renewable Energy Laboratory, NREL). It covers soiling, shading, wiring and mismatch. Victron puts LiFePO4 (lithium iron phosphate) round-trip efficiency at 95 to 98 percent; the formula uses 95.

PVWatts gives a south-facing panel tilted 30° about 4.6 peak sun hours a day over the year in Chicago and 4.1 in Seattle. December falls to 2.5 and 1.5.

Print each day	Wh into battery	Chicago, year	Chicago, December	Seattle, year	Seattle, December
A1 mini, 3 h PLA	297 Wh	75 W	139 W	85 W	227 W
P1S, 8 h ABS	1,387 Wh	350 W	650 W	398 W	1,061 W

Worked for the P1S in Chicago: 1,387 Wh ÷ (4.61 h × 0.86) = 350 W of panels. Size for the darkest month you plan to print, not the yearly average. Charge controller losses come on top, so round up to the next panel size.

How big a battery do you need to run a 3D printer?

Multiply the printer’s average watts by the print hours, divide by inverter efficiency, then divide by the usable share of the battery. A Bambu Lab A1 mini printing PLA for 3 hours needs about 350 Wh of LiFePO4. A P1S printing ABS for 8 hours needs about 1,650 Wh.

Wh drawn from battery = average watts × print hours ÷ inverter efficiency
battery size (Wh)     = Wh drawn ÷ usable depth of discharge

A1 mini, 3 h PLA:  80 W × 3 h ÷ 0.85 = 282 Wh   →  282 ÷ 0.8 = 353 Wh LiFePO4
P1S, 8 h ABS:     140 W × 8 h ÷ 0.85 = 1,318 Wh →  1,318 ÷ 0.8 = 1,647 Wh LiFePO4

The average watts are Bambu Lab’s measured figures: 80 W for the A1 mini on PLA and 140 W for the P1S on ABS. Use the average for battery size, not the maximum. The P1S is rated 350 W, but on ABS it averages 40 percent of its rating.

The 0.85 is a planning figure set a little under the inverter datasheets. Victron lists 87 to 92 percent maximum efficiency for its Phoenix inverters. Samlex rates the SAM-1500-12’s 90 percent peak at half its continuous power. A printer averaging 80 to 140 W runs a 500 W-class inverter well below that point.

Usable depth of discharge depends on the chemistry. Victron says LiFePO4 offers 80 to 100 percent usable capacity, while lead-acid gives only about 50 percent before deep discharge speeds up sulphation:

Print	Wh drawn	LiFePO4, 80% usable	Lead-acid, 50% usable
A1 mini, 3 h PLA	282 Wh	353 Wh	565 Wh
P1S, 8 h ABS	1,318 Wh	1,647 Wh	2,635 Wh

For amp-hours, divide the Wh by the battery’s nominal voltage: 2,635 Wh of 12 V lead-acid is about 220 Ah.

Running short ruins the print. The inverter shuts down at its low-voltage limit, 9.3 V by default on Victron’s 12 V models, and the printer stops mid-layer. Treat the table as a minimum. The electricity cost calculator gives a print’s kWh from a smart plug reading; multiply by 1,000 for Wh and use that in place of the published average.

Can a 3D printer run on an inverter?

Yes, if the inverter’s continuous watt rating is above the printer’s rated maximum. Bambu Lab rates the A1 mini at 150 W and the A1, P1S and X1 Carbon at 350 W on 110 V. Prusa fits the MK4S with a 240 W power supply. Peaks come during warm-up: Innosek measured a Creality CR-10S averaging 306 W over its first 5 minutes of heating.

Read the watt figure, not the VA (volt-ampere) figure. Victron’s 500 VA Phoenix is rated 400 W continuous at 25 °C and 350 W at 40 °C. That is just enough for a 350 W printer in a cool room and marginal in a hot garage. The 800 VA model gives 650 W at 25 °C.

Pick a pure sine wave inverter. Xantrex says modified sine wave output “may cause buzzing, overheating, or inefficient operation in more sensitive equipment”. A pure sine inverter gives the printer’s power supply the same waveform as a wall outlet.

An inverter also draws power with nothing plugged in. Victron lists 4.2 to 12 W of zero-load draw across its Phoenix range, about the same as the 4 to 7 W an A1, A1 mini or P1S draws on standby. Switch both off between prints, or the battery drains overnight.

To size the 12 V or 24 V supply inside a printer you are building, use the power supply calculator.

Can you run a 3D printer from a power bank?

Not from a phone power bank. Desktop printers run on AC mains: Bambu Lab’s P1S and A1 mini take 100 to 240 V AC. USB-C Power Delivery tops out at 240 W, and only on gear built to the 2021 Revision 3.1; before that, the limit was 100 W. A portable power station with a 120 V AC outlet works.

A power station is a battery and inverter in one box, so the battery math above applies to it. Compare its rated Wh with the battery size from the table. Then check that its AC outlet’s continuous rating covers the printer’s maximum. The 350 W printers on this page need an outlet rated above 350 W.