What does non-isolated mean here?

The input and output share a common negative. That suits systems where the source and house banks already share a ground; if you need the grounds electrically separated, use the isolated Orion-Tr Smart instead.

Does it charge lithium batteries?

Yes. It uses a fixed absorption time, 2 hours by default, for lithium, and adaptive absorption for lead-acid. Profiles are configurable to your battery maker's spec.

Will it drain my starter battery?

No. Engine-running detection works with smart alternators (Euro 5/Euro 6) and stops the charger drawing from the starter battery at rest.

Can I connect more than one unit?

Yes. Units can be paralleled without a stated limit to scale output current.

Over Bluetooth with the VictronConnect app. There is no separate display or control panel on the unit.

What cable size do the terminals take?

Screw terminals accept up to 16 mm² / AWG 6.

Victron Energy Orion-Tr Smart 24/24-17A Price History: Lowest $193.80

Q: Where is the Victron Energy Orion-Tr Smart Non-Isolated DC-DC Charger 24/24-17A (400W) cheapest?

At Blue Marine, for $193.80, as of our latest check.

Q: What do buyers say about the Victron Energy Orion-Tr Smart Non-Isolated DC-DC Charger 24/24-17A (400W)?

Rated 4.8 out of 5 from 85 ratings. Buyers like: Speedy replacement of a faulty unit; Able to reach a real person who started the replacement order on the phone; New charger installed and working perfectly. Common complaints: One reviewer received a faulty unit.

Q: Where can I buy the Victron Energy Orion-Tr Smart Non-Isolated DC-DC Charger 24/24-17A (400W)?

14 stores we checked sell it, including West Marine, JB Tools, PKYS, Inverters R US, Defender Marine.

What reviewers say

4.8 / 585 ratings

Rated 4.8 out of 5 across 85 ratings. Buyers describe the charger as working perfectly once installed, and one reported a faulty unit that was replaced.

What people mention

ReliabilityMixedMost buyers report the charger working perfectly after install, but one received a faulty unit.

From Blue Marine

Turns an engine alternator or source battery into a smart multi-stage charger for a second battery bank
Non-isolated shared-ground design runs cooler, more efficiently and in a smaller, lighter housing
Adaptive 3-stage bulk/absorption/float charging for lead-acid, fixed absorption for lithium
Engine-running detection works with smart alternators (Euro 5/Euro 6) and never drains the starter battery at rest
Built-in Bluetooth for setup and monitoring via the VictronConnect app
Screw terminals up to 16 mm² / AWG 6; unlimited units can be paralleled to scale output current

Guarantee: Full 5-year Victron warranty.
Returns: 60 days after receiving your item to request a return; all sales final on open-box units.
Shipping: Free US shipping on orders over a threshold from the Seattle warehouse; lithium batteries and oversize items may carry a shipping charge shown at checkout.

About the Victron Energy Orion-Tr Smart Non-Isolated DC-DC Charger 24/24-17A (400W)

The Victron Energy Orion-Tr Smart is a non-isolated DC-DC charger. It turns an engine alternator or any source battery into a smart, multi-stage charger for a second battery bank. It delivers a regulated charge to the service battery and protects the starter battery it draws from. It works with lead-acid and lithium banks.

This model shares a common negative between the input and the battery being charged, which suits systems where the source and destination banks already share a ground. With no isolation transformer, it runs cooler and more efficiently in a smaller, lighter housing. Systems that need separated input and output grounds require the isolated Orion-Tr Smart instead.

Charging follows a bulk, absorption and float algorithm. For lead-acid, absorption is shortened after shallow discharges and extended after deep ones. For lithium, absorption time is fixed at 2 hours by default. Profiles can be configured to the battery maker's spec, or the unit can be set to a fixed output voltage and run as a stabilized DC power supply.

Model: Orion-Tr Smart 24/24-17A (400W), non-isolated
Input to output: 24 V input, 24 V output
Input range: 16–35 V for 24 V input
Output current: 17 A continuous at 24 V
Power: 400 W
Battery types: Lead-acid and lithium
Lithium absorption: Fixed, 2 hours by default
Connectivity: Built-in Bluetooth, VictronConnect app; no VE.Direct port
Remote control: Remote on/off input for an ignition signal, BMS contact or switch
Terminals: Screw terminals, up to 16 mm² / AWG 6