Stop lifting cell caps and manually checking every battery. The Flow-Rite Pro-Fill system interconnects all your deep-cycle batteries with automatic shut-off valves and flexible manifold tubing so you can fill an entire 48V battery bank in seconds -- with zero overfilling, zero spills, and zero guesswork.
The Pro-Fill BG-U48V-7G-EA is engineered for 48V deep-cycle battery banks configured as eight 6V batteries or four 12V batteries -- the most common configurations found in golf carts, electric vehicles, RV house banks, and floor scrubbers. Each automatic shut-off valve replaces an existing vent cap and seals off the moment the electrolyte reaches the correct level. Connect a single water line, squeeze the trigger, and the system does the rest.
The included Eagle Eye level indicator gives you a visual confirmation that every cell has reached its proper fill level -- no more probing cells with a flashlight or wondering if one battery in the middle of the pack was skipped.
Float-controlled valves stop water flow the instant each cell hits the correct level -- eliminating overfill and acid dilution.
Pre-cut flexible tubing manifolds route water to every cell. Compatible with standard battery terminal post spacing.
Inline visual indicator shows when all cells are filled so you can disconnect with confidence.
Designed to fit 8x6V or 4x12V deep-cycle battery banks. Works with most standard wet-cell flooded lead-acid batteries.
Each automatic shut-off valve installs in place of the existing vent cap -- no drilling, no permanent modifications to the batteries themselves. The 127 flex manifolds interconnect the valves across all batteries in the bank. A single fill port connects to your water source (gravity feed, hand pump, or powered pump). Water flows through the manifold network simultaneously, and each cell's float valve closes independently once the electrolyte reaches the proper level. The Eagle Eye indicator mounted inline confirms full system fill before you disconnect.
This method prevents the two most common battery-maintenance mistakes: underfilling (which exposes plates and accelerates sulfation) and overfilling (which dilutes electrolyte and causes corrosive overflow onto battery trays and cables).
This system is specifically sized for a 48V nominal battery bank. The two most common configurations it serves are:
Batteries must be wet-cell (flooded) lead-acid type. This system is not compatible with AGM, gel, or lithium batteries -- those chemistries are sealed and do not require or accept water.
Always use distilled or deionized water when filling flooded lead-acid batteries. Tap water contains minerals and chlorine that contaminate electrolyte, accelerate plate corrosion, and shorten battery life. The Pro-Fill system is compatible with both gravity-feed distilled water jugs and powered pump dispensers.
The Pro-Fill system is designed for straightforward field installation without special tools. General process: