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Boat Battery Isolators & Charging Relays

40 Items | 1 of 2 pages
 1 2
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Mini Battery Switch & Auto Charging Relay 65 Amp - Blue Sea Systems
Simplifies switching and automates charging for a complete two battery bank solution for outboard powered boats. The Mini Add-A-Battery offers a …
List price: $119.49
Only $79.03
In stock
Promariner Marine Battery Isolators, 1-2 Alternator, 2-3 Batteries, 70/130 Amp
Isolators allow one or more devices to charge multiple battery banks, allowing current to flow in only one direction, preventing batteries from …
List price: $91.53
Starting at:
In stock
API Battery Isolators
These automatic solid state devices allow you to connect your engine alternator directly to both batteries or multiples of batteries without fear of …
List price: $70.00
Starting at:
$63.45
In stock
30A Fail Safe Galvanic Isolator - Guest (Marinco)
Product Features: Prevents the electroplating action that occurs on boats with AC power feeds Voltage Rating: 115/230VAC Frequency Rating: 50/60Hz …
Your price:
$262.95
In stock
50/60A Fail Safe Galvanic Isolator - Guest (Marinco)
Product Features: Voltage Rating: 115/230VAC Passes necessary AC ground current for shore power safety Frequency Rating: 50/60Hz Current Rating: 50/ …
Your price:
$331.05
In stock
ProMariner ProIsoCharge Battery Isolator 120Amp 1-Alt 3-Bat - 12V
ProIsoCharge Series Model ProIsoCharge120 1•3™ Part No. 23124 System Volts DC 12 Max DC Amps 120 Amp Alternator Input 1 Battery Outputs 3 …
List price: $210.39
Your price:
$178.05
In stock
ProMariner ProIsoCharge Battery Isolator 130Amp 2-Alt 4-Bat - 12V
ProIsoCharge Series Model ProIsoCharge130 2•4 Part No. 23127 System Volts DC 12 Max DC Amps 130 Amp Alternator Input 2 Battery Outputs 4™ …
List price: $387.83
Your price:
$328.15
In stock
ProMariner ProIsoCharge Battery Isolator 250Amp 1-Alt 3-Bat - 12V
ProIsoCharge Series Model ProIsoCharge250 1•3 Part No. 23126 System Volts DC 12 Max DC Amps 250 Amp Alternator Input 1 Battery Outputs 3 Size 8. …
List price: $308.86
Your price:
$261.35
In stock
ProMariner ProIsoCharge Battery Isolator 180Amp 1-Alt 2-Bat - 12V
ProIsoCharge™ Series Model ProIsoCharge180 1•2 Part No. 23122 System Volts DC 12 Max DC Amps 180 Amp Alternator Input 1 Battery Outputs 2 …
List price: $224.29
Your price:
$189.85
In stock
ProMariner ProIsoCharge Battery Isolator 250Amp 1-Alt 2-Bat - 12V
ProIsoCharge Series Model ProIsoCharge250 1•3 Part No. 23123 System Volts DC 12 Max DC Amps 250 Amp Alternator Input 1 Battery Outputs 2 Size 6. …
List price: $254.34
Your price:
$215.25
In stock
70 Amp 2 Alternator 3 Bank Battery Isolator - Charles
All Charles Battery Isolators are ignition protected and prevent over-charging. They feature a heat chamber design, protective boots on heavy-duty 5/ …
List price: $239.52
Your price:
$195.15
In stock
160 Amp 1 Alternator 2 Bank Battery Isolator - Charles
All Charles Battery Isolators are ignition protected and prevent over-charging. They feature a heat chamber design, protective boots on heavy-duty 5/ …
List price: $241.08
Your price:
$196.45
In stock
70 Amp 1 Alternator 3 Bank Battery Isolator - Charles
All Charles Battery Isolators are ignition protected and prevent over-charging. They feature a heat chamber design, protective boots on heavy-duty 5/ …
List price: $169.42
Your price:
$138.05
In stock
90 Amp 1 Alternator 2 Bank Battery Isolator - Charles
All Charles Battery Isolators are ignition protected and prevent over-charging. They feature a heat chamber design, protective boots on heavy-duty 5/ …
List price: $177.31
Your price:
$144.55
In stock
60 AMP FAIL SAFE GALVANIC ISO - ProMariner
Failsafe galvanic isolators interrupt galvanic current with other boats in your marina when installed on a boat which is connected to shore power. It …
List price: $442.89
In stock
30 AMP FAIL SAFE GALVANIC ISO - ProMariner
Failsafe galvanic isolators interrupt galvanic current with other boats in your marina when installed on a boat which is connected to shore power. It …
List price: $332.69
In stock
Remote Battery Switches - ML-Remote Battery Switches -Blue Sea Systems
500 Amp magnetic latching (bi-stable) switch provides high-amp switching under load, manually or from remote locations Manual override knob provides …
List price: $212.87
Starting at:
$180.94
In stock
Blue Sea Systems Si-Series Automatic Charging Relay
Automatically manages the charging of two battery banks and isolates batteries during starting to protect sensitive electronics. 120 Ampere …
List price: $109.99
Your price:
$85.33
In stock
L-Series Solenoid Switch
Hermetically sealed contacts, vaporproof. Ignition protected. Pulse circuit requires very low current draw when contact is closed. Input voltage: 9 …
List price: $216.99
Your price:
$184.44
In stock
Battery Isolator (Marinco/Guest/Afi/Nicro/Bep)
Optimized heat sink design for maximum performance. Minimized voltage drop across isolation barrier using Schottky type diodes. Each output …
List price: $212.79
Your price:
$180.23
In stock
Battery Isolator (Pro Mariner)
Rated for 70 amps maximum alternator. Operates on 6, 12, 24 & 32 volt negative ground systems. Electrical current able to flow from DC source …
List price: $91.53
Starting at:
In stock
Battery Isolator (Marinco/Guest/Afi/Nicro/Bep)
Connect engine alternator to two batteries or battery banks for independent battery charging. Isolates batteries and prevents a higher charged …
List price: $82.69
Your price:
$68.38
In stock
Heavy Duty Battery Isolator (Cole Hersee)
For 12-36 volt, DC negative ground electrical systems. Isolate each battery to prevent the battery with the higher charge from draining into the …
List price: $99.39
Your price:
$73.64
In stock
Fail-Safe Galvanic Isolator (Marinco/Guest/Afi/Nicro/Bep)
Prevent galvanic corrosion between boats due to dissimilar metals. Gold plated terminals provide superior corrosion resistance for harsh environment …
List price: $382.29
Starting at:
$298.47
In stock
Blue Sea 7622 ML-Series Heavy Duty Automatic Charging Relay - Blue Sea Systems
7622 Manual Control: Yes Coil Voltage: 12v Features: Manual control switch provides an added level of safety allowing control with or without power, …
List price: $261.63
Your price:
$222.45
In stock
Automatic Charging Relay, 65A 12V - Blue Sea Systems
Automatically combines batteries during charging, isolates batteries when discharging or at rest. 65 Amp continuous rating manages the charging …
List price: $69.09
Your price:
$58.72
In stock
Blue Sea 7620 ML-Series Automatic Charging Relay (Magnetic Latch) 12v DC - Blue Sea Systems
7620 Manual Control: No Coil Voltage: 12V DC Combines battery banks during charging and isolates under discharge 300 Ampere continuous rating …
List price: $245.67
Your price:
$208.85
In stock
Maretron DCR100-01 Direct Current Relay Module
Maretron's DCR100 contains 6 Direct Current (DC) relays, each capable of switching up to 10amps. The DCR100 connects directly to an NMEA 2000 network, …
List price: $395.00
Your price:
$333.75
In stock
Automatic Charging Relay, 500A, 12V
500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when …
List price: $261.63
Your price:
$221.30
In stock
The DDC-12/24 offers the smartest system yet for current and voltage controlled charging between the house and starting batteries eliminating the …
List price: $324.00
Your price:
$253.57
In stock
ProMariner ProIsoCharge Battery Isolator 120Amp 1-Alt 2-Bat - 12V
ProIsoCharge Series Model ProIsoCharge120 Amp, 1 Alt, 2 Battery Part No. 23121 System Volts DC 12 Max DC Amps 120 Amp Alternator Input 1 Battery …
List price: $196.30
Your price:
$166.15
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ProMariner ProIsoCharge Battery Isolator 180Amp 1-Alt 3-Bat - 12V
ProIsoCharge Series Model ProIsoCharge180 1•3 Part No. 23125 System Volts DC 12 Max DC Amps 180 Amp Alternator Input 1 Battery Outputs 3 Size 7. …
List price: $269.36
Your price:
$227.95
Out of stock
40 Items | 1 of 2 pages
 1 2
Boating Know How
ACR

Selecting the Correct Automatic Charging Relay

When selecting a particular Automatic Charging Relay (ACR), there are many things to consider in order to get the correct system for your application. You will need to ... read more take into account the continuous rating and the intermittent rating. The continuous rating will need to reach levels above the highest alternator output rating, and the intermittent rating will need to be above the biggest load for the battery. You will then need to carefully consider which preset ACR settings to choose, followed by the product features.

Preset ACR Settings



Combine Voltage:
  • Batteries will share the present charge.
  • Voltage:13.0 at 2 minutes.
  • Closed relay and combined batteries.
Open Voltage:
  • No present charge; charge input loads will not exceed set limit.
  • Voltage: 12.75 at 30 seconds.
  • Batteries do not share the charge.
Under Voltage Lockout:
  • Charge may or may not be present.
  • Voltage: 9.5.
  • Batteries do not share the charge.

Product Features


Auxiliary Battery Priority (Optional):
  • Combines batteries and closed relays for extended length of time.
  • Open voltage ranging between 12.25 and 12.75 volts.
  • Engine must be running.
Start Isolation (Optional):
  • Batteries are isolated, and the relay is open.
  • Vulnerable products will be shielded by isolated batteries.
  • Engine must be starting.
Start Assist:
  • Closed relay, combined batteries.
  • Batteries share power.
  • Engine must be starting.
Engine Isolation:
  • One relay will be open, while the other will be closed.
  • Two engines must be running.

We do recommend consulting with a mechanic or technician in the process of choosing an ACR and its features.
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