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Boat Battery Isolators & Charging Relays

39 Items | 1 of 2 pages
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Promariner Marine Battery Isolators, 1-2 Alternator, 2-3 Batteries, 70/130 Amp
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 …
Starting at: Too Low to Show!
List price: $91.53
In stock

API Battery Isolators
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 …
Starting at: $63.45
List price: $70.00
In stock

30A Fail Safe Galvanic Isolator - Guest (Marinco)
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

ProMariner ProIsoCharge Battery Isolator 120Amp 1-Alt 2-Bat - 12V
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 …
Your price: $166.15
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List price: $196.30
In stock

ProMariner ProIsoCharge Battery Isolator 180Amp 1-Alt 3-Bat - 12V
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. …
Your price: $227.95
List price: $269.36
In stock

ProMariner ProIsoCharge Battery Isolator 130Amp 2-Alt 4-Bat - 12V
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™ …
Your price: $328.15
List price: $387.83
In stock

ProMariner ProIsoCharge Battery Isolator 180Amp 1-Alt 2-Bat - 12V
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 …
Your price: $189.85
List price: $224.29
In stock

130 Amp 1 Alternator 2 Bank Battery Isolator - Charles
130 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/ …
Your price: $178.55
List price: $219.07
In stock

190 Amp 1 Alternator 3 Bank Battery Isolator - Charles
190 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/ …
Your price: $241.75
List price: $296.63
In stock

70 Amp 1 Alternator 3 Bank Battery Isolator - Charles
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/ …
Your price: $138.05
List price: $169.42
In stock

90 Amp 1 Alternator 2 Bank Battery Isolator - Charles
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/ …
Your price: $144.55
List price: $177.31
In stock

60 AMP FAIL SAFE GALVANIC ISO - ProMariner
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
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
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 …
Starting at: $180.94
List price: $212.87
In stock

Blue Sea Systems Si-Series Automatic Charging Relay
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 …
Your price: $85.33
List price: $109.99
In stock

L-Series Solenoid Switch
L-Series Solenoid Switch
Hermetically sealed contacts, vaporproof. Ignition protected. Pulse circuit requires very low current draw when contact is closed. Input voltage: 9 …
Your price: $184.44
List price: $216.99
In stock

Mini Battery Switch & Auto Charging Relay 65 Amp - Blue Sea Systems
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 …
Your price: $92.98
List price: $119.49
In stock

Battery Isolator (Pro Mariner)
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 …
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List price: $91.53
In stock

Battery Isolator (Marinco/Guest/Afi/Nicro/Bep)
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 …
Your price: $68.38
List price: $82.69
In stock

Heavy Duty Battery Isolator (Cole Hersee)
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 …
Your price: $73.64
List price: $99.39
In stock

Fail-Safe Galvanic Isolator (Marinco/Guest/Afi/Nicro/Bep)
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 …
Your price: $298.47
List price: $382.29
In stock

Blue Sea 7622 ML-Series Heavy Duty Automatic Charging Relay - Blue Sea Systems
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, …
Your price: $222.45
List price: $261.63
In stock

Automatic Charging Relay, 65A 12V - Blue Sea Systems
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 …
Your price: $58.72
List price: $69.09
In stock

Blue Sea 7620 ML-Series Automatic Charging Relay (Magnetic Latch) 12v DC - Blue Sea Systems
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 …
Your price: $208.85
List price: $245.67
In stock

Maretron DCR100-01 Direct Current Relay Module
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, …
Your price: $333.75
List price: $395.00
In stock

Automatic Charging Relay, 500A, 12V
Automatic Charging Relay, 500A, 12V
500 Amp magnetic latching (bi-stable) relay automatically combines batteries during charging and isolates batteries when discharging and when …
Your price: $221.30
List price: $261.63
In stock

Digital Duo Charg 12/24V - Balmar
The DDC-12/24 offers the smartest system yet for current and voltage controlled charging between the house and starting batteries eliminating the …
Your price: $253.57
List price: $324.00
In stock

50/60A Fail Safe Galvanic Isolator - Guest (Marinco)
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
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 …
Your price: $178.05
List price: $210.39
Out of stock

ProMariner ProIsoCharge Battery Isolator 250Amp 1-Alt 3-Bat - 12V
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. …
Your price: $261.35
List price: $308.86
Out of stock

ProMariner ProIsoCharge Battery Isolator 250Amp 1-Alt 2-Bat - 12V
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. …
Your price: $215.25
List price: $254.34
Out of stock

160 Amp 1 Alternator 3 Bank Battery Isolator - Charles
160 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/ …
Your price: $234.65
List price: $287.93
Out of stock

39 Items | 1 of 2 pages
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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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