The AIMS Power BATISO300 Dual Battery Sensing Isolator is designed for 12V dual battery systems that use a starting battery and an auxiliary battery. This automatic voltage-based isolator monitors both batteries and connects them when either battery exceeds 13.2V. When the full battery system drops below 12.7V, the solenoid opens and isolates the starter battery from the auxiliary battery. This helps protect the starting battery from being drained by auxiliary loads while still allowing auxiliary battery charging during vehicle operation. Rated for 300A max continuous current, the BATISO300 is a practical battery management accessory for RVs, vans, overland builds, service vehicles, work trucks, and other 12V mobile power systems.
This AIMS Power battery isolator is made for 12V systems with a main starting battery and auxiliary battery. Its automatic voltage-based operation eliminates the need to tie directly into ignition wiring for standard isolator behavior, helping simplify installation planning.
The BATISO300 monitors both the starting battery and auxiliary battery. If either battery exceeds 13.2V, the isolator connects the batteries; when system voltage drops below 12.7V, it opens the solenoid to isolate the starter battery from the auxiliary battery.
The dual sensing feature allows the main battery to charge from solar or an external charger connected on the auxiliary side once the auxiliary battery reaches 13.2V. This helps support flexible charging layouts for mobile power systems when properly configured.
The optional manual switch, part number BATISOSW, allows manual control for linking the two batteries together with a push of a button. When used, the isolator can allow current flow for 60 seconds without the alternator, even if both batteries are below 12.7V.
This AIMS Power 300A dual battery sensing isolator helps manage charging between a starting battery and auxiliary battery in compatible 12V vehicle and mobile power systems.
With automatic voltage sensing, 13.2V auto-on behavior, 12.7V auto-off behavior, 300A max continuous current, and IP65 splash-proof protection, the BATISO300 supports practical dual battery management.
Need help choosing the right dual battery protection setup?
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✔ Dual battery support ✔ Alternator charging guidance ✔ RV, fleet, and off-grid-ready options
Contact Us for a Quote| Brand | AIMS Power |
| Model / SKU | BATISO300 |
| Product Type | Automatic dual battery sensing isolator |
| System Voltage | 12V |
| Auto-On Voltage | >13.2V |
| Auto-Off Voltage | 12.7V |
| Turn-On Delay | 5 seconds |
| Turn-Off Delay | 10 seconds |
| Max Continuous Current | 300A |
| Standby Current | <5mA |
| Weather Protection | IP65 splash proof |
| Optional Accessory | Manual switch, part # BATISOSW |
| Manual Switch Function | Allows current flow for 60 seconds without the alternator, even if both batteries are below 12.7V |
| Warranty | 3-year warranty and lifetime tech support |
