Go Power GP-BMG Touchscreen Battery Monitor, 500A Shunt
Go Power GP-BMG Touchscreen Battery Monitor, 500A Shunt — Product description
The Go Power GP-BMG is a touchscreen battery monitor that tells you exactly what your house bank is doing. Voltage, current, capacity, state of charge, and how much runtime you've got left at the current draw, all on one clear display. It ships with a 500-amp shunt and a 25-foot cable, so you can flush-mount the screen at the helm and wire the shunt right at the battery.
If you run a house battery bank on your boat, you already know the guessing game. The lights dim a little, the fridge cycles, and you're left wondering how many amp-hours you've actually got left before you need to run the engine or fire up the genset. The Go Power GP-BMG takes the guesswork out of it. It's a battery monitor built around a 500-amp shunt and a touchscreen display, and it reads out the real numbers: voltage, current, capacity, state of charge, and the time you've got left at whatever you're drawing right now.
Here's how it works. The shunt is a precision resistor that sits in the negative line between your battery bank and everything it feeds. Every amp going in or coming out passes through it, and the monitor counts those amps over time. That's what lets it show you a true state of charge instead of just a voltage reading, which on its own can lie to you, especially under load or right after charging. You get a running tally, like a fuel gauge for your batteries.
The GP-BMG works with all battery types, so whether you're running flooded lead-acid, AGM, gel, or lithium, it'll track the bank. On AGM and flooded setups you'll want to enter your bank's amp-hour capacity by hand so the state-of-charge math lines up with your actual batteries. Takes a minute in the menu and then it's set.
The display is a touchscreen with a black faceplate, 4.72 inches long by 2.76 inches wide and only 0.78 inches deep. It flush-mounts into the helm, a bulkhead, or a cabin panel, so it sits clean and flat with no bulky bezel sticking out. On smaller powerboats where dash space is tight, that low profile matters. One honest note: like most glossy touchscreens, it can wash out in direct sun and it doesn't love wet fingers. A lot of owners add a cheap anti-glare film and call it done.
Two alarms are built in. A low-voltage alarm warns you before the bank sags far enough to hurt your batteries or drop out your electronics, and a low-capacity alarm tells you when you're getting near the bottom of your usable amp-hours. Both give you a heads-up while you've still got time to do something about it, whether that's dialing back the load or starting a charge.
The kit ships complete. You get the 500-amp Quick Connect battery shunt connection kit and a 25-foot cable between the shunt and the display, which is plenty of run for getting from an engine-room or battery-locker shunt up to a helm-mounted screen. Mount the shunt as close to the battery bank as you reasonably can and keep that negative run short. It keeps the readings honest, particularly on bigger boats where the batteries and the helm are a long way apart.
Who's this for? Cruisers and liveaboards running a serious house bank who want to actually manage their power instead of guessing. Anglers with a stack of electronics and a livewell pulling amps all day. Anybody who's added solar or a lithium upgrade and wants to see what the system is really doing. It's just as at home in an RV or van build, since the same shunt-and-display setup works the same whether the bank lives under a berth or a dinette. What it's not is a charger or a controller. It watches and reports, it doesn't push power. Pair it with your existing charging setup and let it be your eyes on the bank.
Installation is straightforward for anyone comfortable running DC wiring. The shunt goes in the negative line, the monitor cable runs up to the display, and you flush-cut the panel for the screen. If the numbers ever drift after a long off-season on the hard, a menu reset or a power cycle re-syncs it. Once it's dialed in, you'll wonder how you ran the boat without it.
Key Features
- 500-amp shunt counts every amp in and out for a true state-of-charge reading, not just voltage guesswork
- Touchscreen display shows voltage, current, capacity, state of charge, and time remaining at the current draw on one screen
- Works with all battery types, flooded, AGM, gel, and lithium, so it fits whatever bank you run
- Black flush-mount faceplate, 4.72 in. L x 2.76 in. W x 0.78 in. D, sits flat and clean in a tight helm or cabin panel
- Low-voltage alarm warns you before the bank sags far enough to hurt your batteries or drop electronics
- Low-capacity alarm flags when you're nearing the bottom of your usable amp-hours
- 25-foot cable between shunt and display reaches from a battery-locker or engine-room shunt up to a helm screen
- Quick Connect 500-amp shunt kit ships complete for a straightforward negative-line install
Why Buy from NVN Marine
- Authorized Go Power reseller, full manufacturer warranty
- NMEA member and ABYC certified, advice from real boat techs
- Same-day shipping before 3 PM ET on in-stock items
- NY headquarters and Fort Lauderdale flagship retail store
Technical specifications
| Title | Go Power GP-BMG Touchscreen Battery Monitor with 500A Shunt |
|---|---|
| Brand | Go Power |
| Manufacturer Part Number | GP-BMG |
| UPC | 839085008775 |
| Display Interface | Touchscreen |
| Mounting Style | Flush Mount |
| Color | Black |
| Faceplate Dimensions | 4.72 in. L x 2.76 in. W x 0.78 in. D |
| Monitored Parameters | Voltage, Current, Capacity, State of Charge, Time Left at Current Draw |
| Battery Compatibility | All battery types |
| Shunt Rating | 500 Amp |
| Shunt Connection | 500 Amp Quick Connect Battery Shunt Connection Kit |
| Cable Length | 25 ft |
| Low Voltage Alarm | Yes |
| Low Capacity Alarm | Yes |
Frequently asked questions
How does the GP-BMG measure state of charge?
It uses a 500-amp shunt wired into the negative line of your battery bank. Every amp that goes in or comes out passes through the shunt, and the monitor counts those amps over time to calculate a true state of charge, then shows it on the touchscreen along with voltage, current, capacity, and time remaining at your current draw.
What is the shunt and where does it go?
The shunt is a precision resistor that all your battery current flows through. It installs in the negative cable between the battery bank and the rest of the system. Mount it as close to the batteries as you can and keep the negative run short, that keeps the readings accurate.
Does it work with lithium batteries?
Yes. The GP-BMG works with all battery types, including flooded lead-acid, AGM, gel, and lithium. On AGM and flooded banks you'll want to enter your amp-hour capacity in the menu so the state-of-charge math matches your actual batteries.
How big is the display and how does it mount?
The faceplate is black, 4.72 inches long by 2.76 inches wide and 0.78 inches deep. It flush-mounts into a helm, bulkhead, or cabin panel so it sits flat with no bulky bezel.
How long is the cable between the shunt and the display?
The kit includes a 25-foot cable, which is plenty to run from a shunt mounted at the battery locker or engine room up to a display at the helm.
What alarms does it have?
Two. A low-voltage alarm warns you before the bank drops far enough to damage batteries or drop out electronics, and a low-capacity alarm tells you when you're nearing the bottom of your usable amp-hours.
Is the touchscreen easy to read in sunlight?
It's a glossy touchscreen, so like most it can wash out in direct sun and it responds better to dry fingers. Many owners add an anti-glare film to help with visibility at a sunny helm.
Does the GP-BMG charge my batteries?
No. It's a monitor, not a charger or controller. It reads and reports what your bank is doing so you can manage it. You'll pair it with your existing charging system.
