Lithium house battery 4 day results

[trailertrawlerkismet]

We went cruising in our home waters for a 4 day period, on the hook every day. We feel we’re starting to get a better understanding of how the Lithium House batteries work, how to maximize there capacity so I thought I’d give a short report for those that are interested. We left the dock with 100% SOC ( state of charge) and we were out for 4 nights. Each day we ran the boat from 5 to 14 miles and most days we had the suns help thru the solar panel. We ran an electric coffee pot 4 times, electric toaster 3 times and the electric stove top 4 times in addition to recharging a cell phone and iPad. We also run our refrigerator 24/7 as well as an AC/DC refrigerator style cooler. We ran the hot water three times. In addition we used our propane bbq 3 times, and alcohol part of the stove top 4 times. When we trailered the boat we had a 41% SOC, 13.1 volts and 55 hours of power remaining. In my opinion I’m feeling good about these results, especially with the added benefit of not having to run a noisy generator.

Jim F

 

[knotflying]

Pretty good stats.

 

[trailertrawlerkismet]

My goal here is to better understand how to best utilize the lithium package, share with others and hopefully others can share how they've managed this alternate house bank.

Jim F

 

[Submariner]

LFP is the way to go. I hope one day that Ranger Tug outfits their boats with LFP regardless whether it's for the LE or NW edition for all their gas boats. Put 600ah in for the LE as they do today, maybe just do 300ah for the NW edition.

I put in LFP myself, 320ah on a NW edition. I also have 400 watts of solar.

We spent 4 days up at Cap Sante marina last month without any shorepower while crabbing.
I get very detailed power management numbers via the Victron CerboGX. It monitors the battery monitor and the solar controller. The data is then sent to Victron's cloud app (VRM) via the Internet on the boat's WIFI/LTE. This is where I get all kinds of granularity about our usage.

From July 20 at 6:00pm to July 24 at 6:00pm
8.9kwh of solar (2,225 watt-hours a day, average).
11kwh was consumed total by us on the boat.

We also motored every day for about 2-3 hours doing 6 knots or less crabbing (6nm round trip). So, a little engine charging.

We heated the hot water tank twice and showered on the boat. (every other day).
We steamed, cleaned, picked and froze 29 lbs of picked crab meat in our freezers onboard (we have the cabin and cockpit refer). Freezers worked hard all night. AIS and our WIFI/LTE router stays powered on 24x7. We listened to XM radio all evening picking crab for many hours. Used the lights after-dark as well as we didn't finish until around 10:30pm. Coffee in the morning on the Keurig. A little microwave usage at dinner time.

The lowest the batteries got down to was 34% SOC which was the morning of the 4th day. They can go down to 20%. This left me with 1/2 a days usage remaining (about 50ah). But being it was morning, the sun came up and the house bank was recharging. During the day, solar usually covers all our electrical needs with the left-over going into the house bank to recharge it.

When we got back to the dock at home the house bank was back up to 88% SOC. (engine and solar charging).

Check out the month of July for some interesting stat's. (July 20 @ 18:00 to July 24 @ 18:00).
https://vrm.victronenergy.com/installation/110844/share/9c31bd69

 

[neil]

I had standard batteries in Hilton Head and needed air conditioning which only gave me 1 1/2 hrs. I had lithium batteries installed thanks to Cutwater’s great engineer department and recently went on a 4 hr cruise and still had 1 1/2 hrs left on the meter.
Best thing I ever did considering the hot climate.

 

[it4llc]

I had standard batteries in Hilton Head and needed air conditioning which only gave me 1 1/2 hrs.

I didn't think it was even possible to run the A/C off the AGM batteries...?