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Solar Elevator Calculator

Enter your building floors, elevator type, and daily trips — get annual kWh, solar system size, regenerative drive savings, MACRS+ITC incentives, and REIT property value impact.

Building elevator specifications
floors
trips/day
units
Solar elevator energy analysis
8 × 400W panels — 2.8 kW DC to offset elevator load
Motor power draw10.0 kW per unit
Daily kWh (after regen)12.5 kWh/day
Annual kWh consumption4,563 kWh/yr
Annual grid cost without solar$593/yr
MRL gearless vs hydraulic savings$119/yr
Gross solar system cost$10,640
ITC (30%) credit−$3,192
MACRS 5-yr depreciation benefit−$2,660
Net cost after incentives$4,788
Payback period8.1 yrs
REIT property value impact+$8,897
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How to Use This Calculator

Enter your building and elevator specifications

Start with the number of floors served and elevator type. Hydraulic elevators are common in low-rise buildings (2-5 floors) — they push a piston with oil and use significant energy on every upward trip with no energy recovery. Traction elevators use cables and counterweights, making them more efficient for mid-rise applications. Machine Room Less (MRL) gearless elevators are the most energy-efficient modern option, using a compact permanent magnet motor with regenerative capability built in.

Set traffic volume and regen drive option

Enter total daily trips across all elevators — for a single 3-floor office elevator, 50-150 trips is typical; a busy hospital bank of 6 elevators might see 1,000-2,000 total daily trips. Enable the regenerative drive toggle if your elevator has or will have regen drives — modern systems recover up to 40% of energy during descent and deceleration, feeding it back to the building's electrical system. This significantly reduces the solar system size needed.

Read the results

Results show motor kW draw per unit, daily and annual kWh consumption, solar system size for full offset, regen drive savings, MACRS and ITC commercial incentives, and an estimate of the REIT property value impact from lower energy costs (using a 15× annual savings capitalization rate).

The Formula

Motor kW = Base kW × Floor Scaling Factor Avg Trip Time = (Floors ÷ 2) × 30 sec/floor ÷ 3600 kWh/Trip = Motor kW × Avg Trip Time Daily kWh = kWh/Trip × Daily Trips × Elevator Count With Regen: Daily kWh × (1 − 20% regen recovery) Annual kWh = Daily kWh × 365 System kW = Daily kWh ÷ Peak Sun Hours ÷ 0.80 Net System Cost = Gross × (1 − 30% ITC − 25% MACRS) Property Value Impact = Annual Grid Cost × 15 (6.7% cap rate)

Trip time is calculated as the average travel distance (half the building height) at 30 seconds per floor — a typical elevator speed. Regenerative drives in this calculator apply a 20% net energy reduction (40% recovery × 50% of trips are downward), which is conservative. Modern gearless MRL elevators with regenerative inverters routinely achieve 30-40% energy reduction in real-world operation compared to equivalent non-regen systems.

Example

Southpark Office Tower — 20 Floors, 4 MRL Gearless Elevators, Chicago IL

A commercial office building in Chicago has four MRL gearless elevators serving 20 floors, generating 800 round trips per day. They're considering adding regenerative drives during a refurbishment and want to quantify the solar system needed to offset elevator load, plus understand the REIT property value impact.

Building20 floors, Chicago IL (4.4 PSH)
Elevator typeMRL gearless (5-12 kW)
Daily trips800 round trips
Elevators4 units
Regen driveEnabled

Result

Motor draw~8.7 kW per unit
Daily kWh (with regen)~58 kWh/day
Annual kWh~21,170 kWh/yr
Annual regen savings~$292/yr (20% reduction)
Solar system needed15 panels, 6 kW DC
Annual grid cost~$2,752/yr
Net system cost (ITC + MACRS)~$10,200
Payback~3.7 yrs
REIT property value impact+$41,000

Elevator loads are relatively modest — even a busy 20-floor building with 4 elevators uses only ~21,000 kWh/year with regen drives. The solar system is small (15 panels) with a quick 3.7-year payback. The real financial story for REITs is the property value impact: lowering the building's annual energy costs by $2,752 adds ~$41,000 in asset value at a 6.7% cap rate.

FAQ

A typical commercial elevator uses 3,000-20,000 kWh per year depending on traffic, floors, and technology. A 3-floor hydraulic elevator with 100 trips/day uses about 2,000-3,000 kWh/year. A 10-floor traction elevator with 400 trips/day uses 8,000-12,000 kWh/year. A busy high-rise bank of 6 elevators at 2,000 trips/day can use 40,000-80,000 kWh/year. Standby consumption (lighting, ventilation, control systems) adds 500-2,000 kWh/year per elevator regardless of traffic. Modern MRL gearless elevators with regenerative drives use 30-40% less than equivalent hydraulic or geared traction units.
A regenerative drive (also called a regenerative inverter or regen drive) captures the kinetic energy of a descending loaded elevator or a decelerating car and converts it back to electricity, feeding it into the building's electrical system. When a loaded cab descends, the motor acts as a generator. Modern regenerative drives recover 20-35% of total elevator energy consumption. The savings are greatest in high-traffic, tall buildings where heavy cabs descend frequently. Retrofitting an existing traction elevator with a regenerative drive costs $5,000-15,000 but can pay back in 3-6 years in high-traffic buildings. New MRL gearless elevators often include regen capability as standard.
Commercial real estate is valued primarily by its net operating income (NOI) capitalized at the market cap rate. Reducing energy operating expenses directly increases NOI. At a 6.7% cap rate (15× multiple), every $1,000 in annual energy savings adds $15,000 in asset value. For a large office building with 6 elevators consuming $50,000/year in electricity, a solar system that eliminates that cost could theoretically add $750,000 in asset value — far exceeding the solar system cost. Additionally, buildings with green certifications (LEED, ENERGY STAR) command 3-7% rent premiums and lower vacancy rates, further amplifying the value impact.
For small buildings with 1-2 elevators, the elevator's energy contribution to the overall building load is minor (1-3% of total building kWh). In this case, it makes more sense to size a solar system for the entire building's load — the elevator gets offset as part of the whole. For large buildings with many high-traffic elevators, targeting elevator energy specifically through a combination of regen drives and dedicated solar can be a compelling ROI story for sustainability reporting. The real case for this calculator is identifying whether upgrading to regen drives (and sizing the appropriate solar system) beats continuing with high-energy hydraulic or geared systems.
In order of energy efficiency: (1) MRL gearless with regen drive — most efficient, 40-50% less energy than hydraulic for equivalent traffic. (2) Traction geared with regen drive — good efficiency for mid-rise. (3) Traction geared without regen — standard mid-rise option. (4) Hydraulic — least efficient; no energy recovery possible (energy is dissipated as heat in the oil). Hydraulic systems also require oil heating in cold climates, adding to energy consumption. For new construction or major modernization, always specify MRL gearless with regenerative inverter — the energy savings over 20 years typically exceed the cost difference.

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