HOFEINZ COOLSCHMAX Battery Voltmeter 7V–100V IPX7 Waterproof, Multi‑Chemistry with Adjustable Alarms

HOFEINZ COOLSCHMAX is a rugged, IPX7-rated voltage gauge that monitors 7V–100V battery systems with customizable battery profiles and adjustable alarm thresholds.

This compact voltmeter is built for vehicles, boats, solar setups and industrial equipment that need reliable battery voltage readings across many chemistries. It supports lithium, LiFePO4 and a range of lead-acid types, offers a custom voltage window for nonstandard packs, and keeps settings after power loss — all in a waterproof housing with versatile mounting hardware.

How does this gauge handle different battery chemistries?

The COOLSCHMAX supports multiple preset battery families and lets you define a custom voltage range for unique packs. Choose between lithium (3–22S), LiFePO4 (4–26S), or lead-acid classes (12–84V), or set the 9.5–100V custom mode for special applications. Built-in cell-count detection and manual configuration ensure accurate readings for most common systems.

• Presets for 3–22S lithium and 4–26S LiFePO4 packs
• Lead-acid support: STD, AGM, GEL, EFB up to 84V
• Custom mode: 9.5–100V for nonstandard batteries
• Manual full-charge/discharge thresholds for fine tuning

Will it survive wet or rough environments?

Yes — the unit is IPX7-rated with a reinforced acrylic front and a detachable waterproof silicone plug protecting internal connections. That design keeps the display and electronics safe from rain, splashes, and brief submersion, making it suitable for marine, outdoor or exposed vehicle installations.

• IPX7 waterproof and dustproof enclosure
• Reinforced acrylic waterproof display panel
• Silicone rear plug shields internal circuits
• Durable construction for harsh conditions

What mounting choices and installation options are available?

The COOLSCHMAX comes with flat and angled brackets plus nuts and washers so you can flush-mount, secure with a nut, or bolt it to brackets. No extra hardware is required, and the compact footprint fits panels, control boxes or irregular surfaces with ease.

• Flat and angled mounting brackets included
• Supports flush mount, nut-and-washer, or bracket-and-bolt methods
• Hardware supplied: nuts and washers
• Fits panels, dash openings and control cabinets

How does it manage power consumption and alarms?

Power draw is minimized with normal, low-power and shutdown modes to extend battery life while retaining essential monitoring. The voltmeter includes both undervoltage and overvoltage audible/visual alarms with user-adjustable thresholds, and it remembers all settings after power loss so you don’t have to reconfigure.

• Normal ≤15mA, low power ≤7.5mA, shutdown ≤1mA
• Undervoltage and overvoltage buzzer plus flashing icon
• Alarm thresholds fully adjustable or disable-able
• Automatic power-off memory for all user settings

If you need to revert settings, the one-key factory reset instantly restores defaults so the device returns to stable operation. The backlight is user-configurable to stay on or turn off after a timer, letting you balance nighttime visibility with energy savings.

Who is this for: The HOFEINZ COOLSCHMAX is designed for technicians, boat owners, RV and camper DIYers, EV hobbyists, solar installers and fleet operators who need a versatile, waterproof voltmeter that supports many battery types and mounting scenarios. It's a practical choice when you require robust monitoring, adjustable alarms and reliable performance in damp or mobile environments.