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Battery usage at anchor

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Dubs2021 View Drop Down
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    Posted: 27 July 2022 at 22:29
Kept some records of our 6 days at anchor last week in the Salish Sea. 

This is a 2021 Hanse 348 commissioned in late August 2021. I have 2 x 160 amp AGM batteries in the house set. Before this trip I installed a Victron BMV712e to monitor the house bank. Though I plan to add permanent solar panels, I started with an indirect solar recharging system, which is a Jackery 1000 battery/inverter which I recharge with its own portable 200W solar panels. When the Jackery is plugged into the boat, it runs the boat's battery charger. During our 6 days anchored off the grid, my only engine use was to run the windlass to change mooring positions in the same bay. 

The list below shows Ah used by various components. With a prior boat we had an incomplete list, so I did my best to test all the components a skipper would use. I am pleased with the results. I never went below 93% house capacity overnight. The fridge ran 24x7. The relatively low 4 Ah used by the fridge, and how it cycles off over 50% of the time, this is very good performance. 

Low High Appliance
0.46 0.72 Resting, nothing switched on
0.00 Water switch on
4.90 Water pump on
0.40 4.00 Refrigerator
4.00 8.00 Furnace on, Hi # to start, settles to Lo #
1.00 1.30 Nav switch on (Lo), Plotter on (Hi)
0.50 Anchor light
0.25 Running lights
0.50 Interior lights enabled (DC switch)
0.20 Salon side lights on
0.80 Ceiling lights on
0.15 One desk/reading light on
0.40 Propane solenoid on
0.70 VHF radion on
Cumulative Ah used
5.60 1 hour after fridge startup
40.00 24 hours fridge on, very little other used
19.00 9 hour overnight with fridge & anchor light

Hugh
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Tranquillity View Drop Down
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Tranquillity Quote  Post ReplyReply Direct Link To This Post Posted: 27 July 2022 at 22:58
Very interesting. Thanks for posting.
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S&J View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S&J Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2022 at 06:39
I am also interested in this as I'm trying to analyse how our 1.2-1.7kW daily power use breaks down.  Now that I have the Victron Venus software installed on a raspberry pi I can get a clearer picture.

My "base" usage is about 2.5A which includes light circuit, water pump, fridge circuits on the switchboard plus the RPi and an LTE modem, both of which run permanently.

I analysed the fridge last year and found it was using 4-5A, but the compressor only kicks in 25% of the time.  Now I am in the Med that has increased to about 33% of the time.

So overnight we use around 50Ah before the solar starts to compensate in the morning.

Our daily solar varies between 1.2-1.7kW which sort of matches our consumption but clearly we have a problem on a 1.2kW solar day with 1.7kW consumption.  This tends to be when we sail as we use more power for instruments, autopilot, winches and windlass and the sails probably block the solar panels more.  But then we also have the engine usage to compensate.

Our "worst" consumer is a 45W charger for laptops.  Sadly more work is being done than planned, despite supposed retirement.
H458 #159 Primal Mediterranean cruising
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Dubs2021 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Dubs2021 Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2022 at 15:21
Thanks for the additonal posts. S&J: what solor capacity do you have to generate 1.2-1.7 kW per day? Once I install solar, which I hope will be 200W capacity, our charging should be positive in summer sailing. I would then use the Jackery portable lithium ion invertoer for device charging, including the Torquedo outboard motor I have for the dingy. 
Hugh
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Fendant Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2022 at 16:40
Thanks Hugh, this absolutely in line what we measured over the years on our H 345.
Since  2 years I have a hour counter for the fridge. It consumes 4- 5 Amp and runs 53% of the time in May - June season. This year we had in July a unbelievable weather for 4 weeks with temperatures 23 - 28 deg peaking  a few days at 32 deg. Fridge run time went up to 56% ( avg over a week ).
With instruments, autopilot, VHF, radio and fridge we use about 40 Amps in a 6 hour sailing day.

Biggest short term consumption is when we use our Nespresso machine via a 1600 E Victron inverter.

Frank
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S&J View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S&J Quote  Post ReplyReply Direct Link To This Post Posted: 28 July 2022 at 18:39
I have 2 x 120W (max yield 1.2kW) and 2 x 80W (max yield 700W).
They are placed in front of the jib track and on the rope covers so do get some shading.
I also have an electric outboard (ePropulsion) and use a solar mat (approx 100W) to charge this but it is very slow.  I can also use the mat to charge the domestic batteries in addition to my fixed panels, so will sometimes do this and then charge the outboard battery from the 12V or if running the engine from a 230V inverter.
My inverter is only 500W - I decided to limit AC appliances to low power devices.

The fridge measurements are interesting.  Subjectively I feel that the fridge on my 2021 458 switches on less the the one on my 2015 385.  The design of the newer fridge is different as it has what look like ice packs under the freezer area.
I did measure the 24 hour usage of the fridge last year and was delighted to find it used little more than 1A per hour on average.  This was in northern Europe but now I am in the Med with 30C temperature I can see it is switching on about 33% of the time so that will now be higher.
Because it has been so hot I turned the thermostat up (down?) from the minimum (in terms of power usage)  setting with undesirable results.  The ice box frosted up in a few days and the main fridge didn't get as cold.  I have reverted to running it at the lowest power setting which still makes ice cubes and freezes food in the freezer compartment and keeps the beer and wine cold in the main fridge.
I'm ordering some Ruuvi sensors which I'll add to my Victron Cerbo so I know the actual temperature of the fridge and freezer.


Edited by S&J - 28 July 2022 at 18:56
H458 #159 Primal Mediterranean cruising
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CaptainDram Quote  Post ReplyReply Direct Link To This Post Posted: 18 August 2022 at 15:06
What brand are the AGM batteries in the 2021 delivered boat please? How do they perform?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote S&J Quote  Post ReplyReply Direct Link To This Post Posted: 18 August 2022 at 15:45
See https://myhanse.com/battrey_topic13568.html?KW=Battery

The standard batteries are 160Ah Q- Batteries.  There are more details and a link to the UK supplier in the post above.

I had two if these in my 385 and after 6 seasons there was some loss of capacity but generally holding up well.

I now have 3x 160Ah but I am almost exclusively at anchor rather than I. Marinas so they are being used.much harder.  I have 400W solar which just about keeps pace with my usage in the Med summer.  I still need topping up with shore power once a week or so to get them into float mode.
H458 #159 Primal Mediterranean cruising
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CaptainDram Quote  Post ReplyReply Direct Link To This Post Posted: 18 August 2022 at 16:11
Thanks Stuart, info much appreciated. Thinking of adding one on when delivered and info on that thread was useful.

Hope life is good in the Med, we're heading out to the Ionian in a week for a brief charter. Keeping the hand in until our Hanse is delivered next year!
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