Marinette Boat Forum

This topic is a redirect from " Rebuild a Kohler 7.5R generator" http://marinetteboat.com/forum/viewtopic.php?f=4&t=2002

This will cover the build of a "portable" LiFePo4 lithium battery whose intent is to be used on our 41' Marquis and a popup camper. That's why it's called "portable. It's assumed (terrible word... ) that if we're on the boat (it's most needed locale), we won't be needing it on the popup camper - and - when we're using the popup camper, the boat will be at the dock with a stable shore power supply.

I'm including a series of pics and other information should there be someone inclined to build their own battery.
Battery specs:
- 280Ah
- 12 volt
- 110AC usage - via a Xantrex 2000W inverter / charger with wired remote unit

Intended use - to power the boat's and camper's (depending on usage) refrigerator(s) 2 on boat - 1 on camper
Wattage requirements -
Main boat fridge/freezer - 4.8Cu ft Magic (75w)
Upper station fridge/freezer - (70w)

Popup - 1.9 Mini fridge/freezer - 75w

Additional AC power needs COULD be utilized, but the intent is to stretch battery power for the fridges/freezers.

In either case there will be several days available power solely from the battery.
** There will be several alternative sources to recharge the battery:
(this is just for the boat. The popup is a separate listing. Ask if you'd like more info.)
- AC Shore Power/Genny via the Xantrex inverter charger,
- Engine alternator power via connection to the house battery that feeds a 20Amp DC to DC Victron charging unit,
- Solar power via 2 - 200W solar panels

If you have any questions, please feel free to ask!

Bill

Battery is a self contained unit utilizing the LiFePo4 cells (4 - 280Ah), a Daly 250A BGMS (battery Management System (BMS = MUST HAVE!), Victron BMV-712 (Shunt - battery monitoring system <w/ corded meter/display, 2-0 AWG cables to connect to Inverter, 2-0 AWG cables to connect 4 lug positive and 4 lug negative wiring blocks, 200 Amp ANL fuse, 40A Renogy Solar controller, misc SS lock nuts, bolts, washers.
If I've overlooked anything, I'll edit this post with a noted addendum.
LiFePo4 cells purchased from 18650batterystore.com . Great prices. Located in US. Quick delivery.
Note - the battery lugs on top of the cells offer a better connection system (2 screws / single lug).

Bill

1st pic -
Frontal view - lid closed
Used the largest tool box offered by Menards.

2nd pic - Frontal view - lid open
Note battery connection lugs in lid (left side). 2-0 AWG battery cables will run to inside connection points to the appropriate ( + or -) bus bars. Outside lugs will have 2-0 AWG cables running to Xantrex 2000w inverter/charger's DC Input connection points.

3rd Pic - Lid overhead view. Solar charge cable & connector.

4th Pic - 20A DC to DC charge unit & Pos & Neg bus bars.

5th pic - BMS (Battery Management System) & Solar Charge unit.

6th pic - Overhead view - lid open - overall with text details

You'd need a dumpster for the lead acid batteries to equal that beauty!

Jeff

I'm puzzled at why the pix rotate when you click on them to expand the view. By the way, Bill, I thought you could put multiple pix in one post.