APC Back-UPS Pro BR1500MS2 Specs — Watts, Sine Wave & Battery
TL;DR — APC Back-UPS Pro BR1500MS2 at a glance:
- Output: 1500VA / 900W, pure sine wave, line-interactive with AVR
- Outlets: 10 total (5 battery backup + surge, 5 surge only) plus 2 USB charging ports (1 USB-A, 1 USB-C)
- Replacement battery: APCRBC163 — 2x 12V 9Ah AGM cells, hot-swappable
- Runtime: ~9 minutes at half load (450W), ~3 minutes at full load (900W)
- Best for: home office workstations, gaming PCs, small servers, network gear that needs active PFC compatibility (sine wave output)
The APC Back-UPS Pro BR1500MS2 is one of the most-asked-about line-interactive UPS units in Canada — partly because it sits in the sweet spot for power-hungry workstations and small-server setups, and partly because pure sine wave output at this price tier is unusual. This guide walks through the full specs, runtime expectations, and replacement battery (the APCRBC163) so you can size and budget the unit correctly before buying.
Quick Spec Summary
| Specification | Value |
|---|---|
| Topology | Line-interactive with AVR (Automatic Voltage Regulation) |
| Output capacity | 1500VA / 900W |
| Output waveform | Pure Sine Wave (compatible with active PFC power supplies) |
| Input voltage | 120V (NEMA 5-15P plug) |
| Outlets | 10 NEMA 5-15R (5 battery backup + surge, 5 surge only) |
| USB charging | 2 ports (1 USB-A 5V/2.4A, 1 USB-C 5V/3A) |
| Connectivity | USB Type B (HID-compliant for PowerChute Personal Edition) |
| Replacement battery | APCRBC163 — 2x 12V 9Ah AGM SLA, hot-swappable |
| Form factor | Tower |
| Weight | ~32 lbs (14.5 kg) |
| Surge protection | 1080 Joules |
| Audible alarm | Yes (configurable via PowerChute) |
Why Pure Sine Wave Matters
Most budget UPS units output a simulated or stepped sine wave on battery power. That works for older PCs, but modern computers with active PFC (Power Factor Corrected) power supplies — which includes most desktops built in the last decade, gaming rigs, and small server motherboards — can throw errors, reboot, or shut down outright when fed a stepped waveform on battery transfer.
The BR1500MS2 outputs a true pure sine wave on battery, which is functionally identical to utility power. That's why it's the entry-level pick for anyone running an active-PFC PSU, and why it costs more than the equivalent stepped-wave Back-UPS BX1500M.
Runtime Expectations
- 225W load (~25%): ~22 minutes
- 450W load (~50%): ~9 minutes
- 675W load (~75%): ~5 minutes
- 900W load (100%): ~3 minutes
If your real-world load is unclear, run your numbers through our UPS runtime calculator — it accepts wattage or VA and returns expected backup time at your draw.
The APCRBC163 Replacement Battery
The BR1500MS2 ships with two 12V 9Ah AGM SLA cells wired in series (24V battery pack). When the original cells reach the end of their service life — typically 3 to 5 years for VRLA batteries — the OEM replacement is the APCRBC163 cartridge.
- Battery type: AGM Sealed Lead Acid (SLA / VRLA)
- Cells per cartridge: 2 cells
- Voltage: 12V each (24V pack)
- Capacity: 9Ah each
- Hot-swappable: Yes — can be replaced without powering down protected equipment
- Service life: 3–5 years under normal conditions; longer with proper ventilation and stable ambient temperature (20–25°C)
Browse compatible cells in our all-UPS replacement battery hub — we carry both OEM APCRBC163 cartridges and equivalent AGM cells from RBC-grade alternative manufacturers.
What Should You Plug Into It?
The 5 battery-backup outlets should be reserved for equipment that needs to ride through outages cleanly:
- Desktop PC or workstation tower
- Primary monitor (one only — large monitors can draw 30–40W each)
- External NAS or backup drive
- Cable modem and router (so internet stays up during brownouts)
- VoIP phone or DECT base station
The 5 surge-only outlets are for printers, secondary monitors, speakers, lamps — things that don't need battery runtime but benefit from surge protection.
BR1500MS2 vs Common Alternatives
| Model | Capacity | Waveform | Outlets | USB charging | Best for |
|---|---|---|---|---|---|
| BR1500MS2 | 1500VA / 900W | Pure Sine Wave | 10 | USB-A + USB-C | Active-PFC desktops, gaming, small server |
| BR1000MS | 1000VA / 600W | Pure Sine Wave | 8 | USB-A + USB-C | Lighter desktops, single workstation |
| BX1500M | 1500VA / 900W | Stepped (simulated) | 10 | USB-A only | Older / non-active-PFC equipment, budget builds |
| SMT1500C (Smart-UPS) | 1500VA / 1000W | Pure Sine Wave | 8 | None | Network gear, rack-mount, NMC-managed |
If you need rack-mount form factor or network management card support, the APC vs Tripp Lite UPS for network closets guide covers the Smart-UPS line in detail.
Topology Reminder: Line-Interactive vs Online
The BR1500MS2 is a line-interactive unit — it normally passes utility power through (with AVR correcting minor voltage swings) and only switches to battery when the input fails or moves outside an acceptable window. Transfer time is typically 6–10 ms, which is invisible to PCs but can matter for medical-grade or always-on applications. For those, you want online double-conversion instead.
Our line-interactive vs online UPS guide walks through where the line-interactive class is sufficient and where you should step up to online.
Maintenance and Battery Replacement
The BR1500MS2 will outlast its first set of batteries by years — the electronics are typically good for 8–12 years, while the AGM cells need swapping every 3–5 years. When the front-panel "Replace Battery" indicator lights up, or when PowerChute reports the self-test as failed, it's APCRBC163 time.
- Confirm the cartridge model is APCRBC163 (printed on the existing pack)
- Order a replacement — OEM or equivalent AGM cells from our battery hub
- Hot-swap procedure: unlatch the front panel, slide the old pack out, slide the new pack in, reconnect
- Run a self-test (PowerChute or front-panel button) to confirm
For multi-unit fleets or business deployments, our UPS battery replacement service handles disposal of old cells (lead-acid is regulated under provincial Hazardous Waste rules) and onsite installation.
Frequently Asked Questions
What is the wattage of the APC BR1500MS2?
The BR1500MS2 outputs 900 watts at 1500VA. The wattage is what matters for sizing real loads — a 900W output means the UPS can safely power equipment drawing up to 900W continuously. The VA rating is a higher number because it includes apparent power, but real PCs and servers are watt-limited.
Is the BR1500MS2 pure sine wave?
Yes. The BR1500MS2 outputs a true pure sine wave on battery power, which makes it compatible with active PFC power supplies found in modern desktops, gaming PCs, and small server motherboards. Stepped/simulated sine wave UPS units (like the cheaper BX1500M) can cause active-PFC PSUs to throw errors on battery transfer.
What replacement battery does the BR1500MS2 use?
The OEM replacement battery cartridge is the APCRBC163. It contains two 12V 9Ah AGM SLA cells wired in series (24V pack) and is hot-swappable. Service life is typically 3 to 5 years. We carry OEM APCRBC163 cartridges and equivalent cells in our replacement battery hub.
How long will the BR1500MS2 run during a power outage?
Runtime depends on load: about 22 minutes at 225W (25% load), 9 minutes at 450W (50% load), 5 minutes at 675W (75% load), and 3 minutes at full 900W load. For a typical home office desktop drawing 200–300W, expect 15–25 minutes of backup. Use our UPS runtime calculator to estimate your specific setup.
Can I plug a laser printer into the BR1500MS2?
No — plug laser printers into the surge-only outlets, never the battery-backup outlets. Laser printers can draw 1000–1500W in inrush during the fuser warm-up cycle, which exceeds the BR1500MS2's 900W continuous rating and will trip the unit into overload.
Where to Buy and Service
For new BR1500MS2 units, replacement APCRBC163 cartridges, or a refurbished alternative, browse our APC Back-UPS Pro collection. For multi-unit business deployments — especially if you need preventive maintenance contracts, onsite battery swaps, or fleet management — our service team at GDF Technologies handles APC service Canada-wide.
Still sizing your setup? Pair this guide with our UPS FAQ and UPS battery FAQ for buyer-side fundamentals.
