12V Dual Battery Smart Isolator, Voltage Sensitive Split Charge Relay

Rated 4.80/5 by 102 shoppers

€29.99

• Links both batteries automatically at 13.3V once the engine is charging
• Splits them again at 12.8V when you stop, so the starter battery never drains
• LED indicator shows at a glance when the batteries are linked
• Suits campervans, caravans, boats, RVs, ATVs, UTVs and trucks
• Compact plastic housing with silicone-sealed internals
• Fuse accessories within 30cm (0.98ft) of the second battery

Run a fridge, lights or sounds from a second battery and the worry is always the same: will the van still start in the morning? This voltage sensitive relay (VSR) removes the question. When the engine is running and the starter battery climbs to 13.3V, the relay engages, links both batteries and charges the second one — the LED lights to confirm the pair are connected. Switch off, and as the voltage falls to 12.8V the relay disconnects the two batteries automatically. Your accessories then draw only from the auxiliary battery, leaving the starter battery full and ready. There is nothing to switch, monitor or remember — it is entirely automatic. The unit is compact enough to mount almost anywhere and its internals are sealed with silicone. It suits campervans, caravans, boats and marine craft, RVs, ATVs, UTVs and trucks — any 12V twin-battery setup. One installation note: fuse any accessories connected to the second battery within 30cm.