BMPRO’s ProBoost40 is a DC-DC battery charger that allows you to charge a secondary battery using solar panels and/or a towing vehicle’s 12V electrical system. The ProBoost40 blends both the solar and auxiliary inputs together, up to a maximum of 40A, to ensure there is always a consistent charge to your battery. Compatible with both lead-acid and lithium LiFePO4 batteries, the high power density design of the ProBoost25 provides efficiency of up to 95%. The ProBoost40 has an ultra-thin design, making it suitable for installation in small spaces, and is resilient to shaking, as well as wet, dusty or muddy environments. A range of protective features built into the ProBoost40, such as overtemperature, overvoltage and undervoltage protection, will guard your charging capacity. KEY FEATURES In vehicle multi-stage DC-DC charger Dual input MPPT solar/aux (alternator) Multi battery chemistry selector Suitable for modern smart alternators IP66 rating – resistant to dust, water and shock damage Maintains a 100% state of charge of auxiliary batteries BMPRO signature durability and ease of use