Starter motor for Diesel engines in boats draw a lot of current 250A is this appropriate for engine batteries?

Good Day, No, this produkt is only for 20amps designed. Regards Offgridtec GmbH

Can I use this just to shut off battery when discharge drops V too low? How? Batt+ to device Batt+ "In" & Batt- to device Load- "Out"?

The kemo m148a comes with instructions. Also some specs can be found with the item on-line. I will refer to the kemo m148a in the following response as 148. The 148 max amp rating is 20 amps with the addition of a metal backing plate the can be easily added with a few tools. As shipped the 148 is rated for 10 amps. Remember this is 12 v dc current. Connect appropriate wire and appropriate fuse from battery 12 v + to the 148 and marked battery +. For the battery 12 v - repeat the process except for fuse installation. From 148 load + repeat the process to connect to the device + to be controlled by the by the 148. From 148 load - repeat the previous process. The voltage disconnect range can be adjusted up or down on the 148 marked as switch off adjustment. I had to adjust in very small increments. Turning power off to the battery charge controller and running 148 controlled device (in my case an ice box). I had to turn on the the battery charge controller and turn off several times until I had the 148 adjusted to disconnect at 12.8 v dc (in my case).

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Battery Guard 12V DC

Product ID: 603050163

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Details

Brand
KEMO
Size
12 x 11 x 4 cm
Product Dimensions
2.36"D x x
Number Of Cells
6
EU Spare Part Availability Duration
1 Years
Manufacturer
Kemo

⚡Interrupting voltage: 10.4-13.3 V

🔋Max. switching capacity: 20 A

🔧Resistance: 0.3 mΩ

Description

🔋 Power Up Your Protection!

📏 COMPACT DESIGN - Sleek dimensions (87 x 60 x 33 mm) fit seamlessly in your vehicle.
🌡️ ENHANCED COOLING - Supports up to 20 A with additional cooling for heavy-duty use.
🛠️ HASSLE FREE SETUP - No assembly required—plug and play for instant protection.
⚙️ ADJUSTABLE SETTINGS - Customize interrupting voltage for optimal performance.
🔒 PROTECT YOUR INVESTMENT - Safeguards your car battery from total discharge.

The Battery Guard 12V DC by Kemo is a compact and efficient device designed to protect your car battery from total discharge. With adjustable interrupting voltage and a maximum switching capacity of 20 A, it ensures your battery remains in optimal condition. Weighing only 190 grams and requiring no assembly, it's the perfect solution for hassle-free battery management.

Specifications

Brand	Kemo
Size	87 x 60 x 33mm
Item Weight	0.19 Kilograms
Resistance	0.3 Milliohms
Terminal	SAE Terminal
Manufacturer	M148A
Product Dimensions	12.19 x 11.4 x 3.51 cm; 190 Grams
Batteries	1 Unknown batteries required.
Item model number	M148A
Manufacturer Part Number	1427335
Colour	Black
Assembly Required	No
Manufacturer	M148A
Item Weight	190 g