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SmallBMS for Smart LiFePO4 Batteries with M8
A simple and low-cost alternative to the VE.Bus BMS. The smallBMS can replace the VE.Bus BMS in several applications. It is however not suitable for use with VE.Bus MultiPlus and Quattro inverter/chargers: it has no VE.Bus interface.
The smallBMS is intended for use with Victron Smart LiFePo4 batteries with M8 circular connectors. The smallBMS has three outputs, similar to the VE.Bus BMS. Load Disconnect output The Load output is normally high and becomes free-floating in case of the cell under voltage (default 2,8V/cell, adjustable on the battery between 2,6V and 2,8V per cell). Maximum current: 1A. The Load output is not short-circuit protected.
The Load output can be used to control:
Pre-alarm output
The pre-alarm output is normally free-floating and becomes high in case of the imminent cell under voltage (default 3,1V/cell, adjustable on the battery between 2,85V and 3,15V per cell). Maximum current: 1A (not short circuit protected).
The minimum delay between pre-alarm and load disconnect is 30 seconds.
Charge disconnect output
The Charger output is normally high and becomes free-floating in case of imminent cell overvoltage or over-temperature. Maximum current: 10mA. The Charger output is not suitable to power an inductive load such as a relay coil.
The Charger output can be used to control:
System on/off input
The system on/off input controls both outputs. When off, both outputs will be free floating so that loads and chargers are turned off. The System on/off consists of two terminals: Remote L and Remote H. A remote on/off switch or relay contact can be connected between L and H. Alternatively, terminal H can be switched to battery plus, or terminal L can be switched to battery minus.
Protects 12V, 24V and 48V systems
Operating voltage range: 8 to 70V DC.
LED indicators:
Easy Returns
We've taken out the hassle of returning an item so you can shop with confidence. If you need to return an item, we'll provide you with a pre-paid UPS return label that you can print at home. The cost for using the label will be calculated and deducted from your refund.
To start a return, please contact us at sales@theyachtrigger.com. Items sent back to us without first requesting a return will not be accepted.
30-Day Return Policy
We have a 30-day return policy, meaning you have 30 days after receiving your item to request a return or exchange.
Eligibility for Returns
To be eligible for a return, your item must be in the same condition that you received it—unworn or unused, including tags, instruction manuals, warranty cards, and in its original packaging. You’ll also need the receipt or proof of purchase.
We reserve the right to refuse returns or assess additional fees at our discretion if:
The merchandise is missing parts
The item is not in new condition
The return is beyond the accepted return dates
Return Shipping & Restocking Fees
Customers are responsible for return shipping.
If you request The Yacht Rigger to provide a shipping tag, the shipping cost will be deducted from your refund. No international return shipping labels will be provided.
A 3% restocking fee will apply.
No returns on final sale items.
Damages and Warranties
Please inspect your order upon receipt and contact us immediately if the item is defective, damaged, or if you received the wrong item.
Most items we sell are covered by manufacturers' warranties. If you experience difficulty with a product, please contact the appropriate manufacturer for assistance and troubleshooting help, or email us at sales@theyachtrigger.com. If your order was received via freight truck, you must notify us within 5 days.
Exceptions / Non-Returnable Items
Certain types of items cannot be returned, such as custom products and special orders. This includes cut line, wire, rope, and similar items that are customized to length. We also do not accept returns for hazardous materials, flammable liquids, or gases. Unfortunately, we cannot accept returns on sale items or gift cards.
Exchanges
The fastest way to ensure you get what you want is to request a return of the item you have. Once the return is accepted, you can make a separate purchase for the new item to ensure it is in stock.
European Union 14-Day Cooling Off Period
If the merchandise is being shipped to the European Union, you have the right to cancel or return your order within 14 days, for any reason and without justification. As above, your item must be in the same condition that you received it—unworn or unused, with tags, instruction manuals, warranty cards, and in its original packaging. You’ll also need the receipt or proof of purchase.
Refunds
We will notify you once we’ve received and inspected your return and inform you if the refund was approved. When processing a refund, no additional transaction fee is incurred; however, the original credit card transaction fee is not refunded.
If approved, you’ll automatically be refunded to your original payment method within 10 business days. Please allow some time for your bank or credit card company to process and post the refund. If more than 15 business days have passed since we’ve approved your return, please contact us at sales@theyachtrigger.com.
Return Policy Abuse
We reserve the right to refuse service to anyone suspected of abusing any policy of The Yacht Rigger.
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200 14th Avenue Southeast, St. Petersburg, FL 33701
7C San Bartola Drive, Saint Augustine, FL 32086




Installed on Yanmar 4JH57 engines with Zeus Controllers - HOLY WOW power. Losing some power at top end but overall very satisfied. Will do a long term review later. Talk about power - hope to never need my generator again!
We bought these boots in 2022, and are buying new ones 3 years later. We love the design and the fact that they are easy to remove for inspection of the rig.
Review for electrical system components:
• Victron Lithium Battery 24VDC 300Ah NG Smart LifePO4 (x4)
• Victron Lynx Smart BMS 500 NG (M10)
• Victron Lynx Distributor w/M10 Terminals (x2)
• Victron MultiPlus-II 24/5000 120-95 120V (x2)
• Victron Phoenix Smart IP43 Charger 24/25 (1+1) 120-240VAC (x5)
• Victron Cerbo GX MK2 w/ Victron GX Touch 70 Flush Mount Display
• Z Bar - Class T battery link Bundle w/ Blue Sea 5119 300AMP Class T Fuse (x4)
• Victron Orion XS 1400 DC-DC Battery Charger (x2)
• Victron SmartSolar MPPT Charge Controller - 100V - 30AMP - UL Approved (x4)
Complete upgrade of my Irwin 54 Sloop electrical system –
Phase 1 – Remove 9KW generator, install 30KW LifePO4 battery system, inverter chargers, battery chargers, etc. wired for worldwide shore power capability to ABYC standards. Installation made possible with guidance and support from Andre Cormier and The Yacht Rigger.
I was amazed with the product especially, the attention to detail. I was also very pleased with the help and recommendations I received from Chris Wilcher. He made the purchase very easy.
I was very pleased with the product especially, the attention to detail. I was also pleased with the support I received from Chris Wilcher. He made the purchase very easy.



