Problems ??

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Potential Defective House Battery / Advice for new batteries

  • Balliol Fowden
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02 Nov 2023 12:55 #1 by Balliol Fowden
225 AH is a bit low on capacity. 450 should be enough (we run a 30 metre ship on that), but it does sound as if it worked OK before so something would seem to have changed, and I would not have thought that a new pressure jet boiler should have changed the status quo much if at all. 

The only actual symptom of battery issues that you have mentioned is the low battery warning on your Victron. What is the actual voltage at the battery terminals, off load & rested? Could it be that a setting on the Victron has changed?

Balliol.

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  • Peter Mossman
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02 Nov 2023 12:07 #2 by Peter Mossman
First thought is the overall capacity of your domestic battery bank is too small; even if you allow them to discharge to say 60% (I never go that low) there is only approx. 100 ahs available before the need to recharge.  We have a similar set up but with 8 x 125ah agm batteries providing about double the capacity and some solar panels.
Now that its autumn have you been using the central heating? Boilers can be surprisingly power hungry. Combined with the fridge freezer on 24/7 100 ah is not a lot.
Whilst battery monitors need managing to be accurate overall the 'i' amps readout does give a useful indication of the live current draw and I'd suggest noting the figures when both boiler and f/freezer are running. Worst case do it again after dark with the lights and tv on as well and note that. Multiply by hours used and it will give a very rough idea of the maximum being demanded from the b/bank.

As has been said it really needs a thorough audit of everything to be more accurate
Peter

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  • Douglas Jaarsma
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01 Nov 2023 14:40 #3 by Douglas Jaarsma
During the overhaul same time batteries were changed; I replaced the Roca Gavina Confort Boiler with a Post Marine Combi Boiler.  Looking at old documents from the previous owner they had 230 Ah batteries; Multiship Holland replaced with 225 Ah batteries.   They are both in series for the 24V system; the bow thruster has its own independent bank of 220 Ah Vetus SMF batteries in series.

Regards fridge/freezer very good seal and vents through the top and is clean.

I checked both separately last evening not attached and there was a 0.3 volt difference between the batteries.

I will attempt to do the tests with the multimeter now that I am back at my home marina and completing my winter preps.

Dutch Barge Janine: 19.95m x 4.25m; 130hp John Deere Marine Diesel; Kohler Quiet Generator,

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  • Jan Pieterse
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01 Nov 2023 14:11 #4 by Jan Pieterse
Besides the point Andy is making 

check each of the 2 batteries separate also with the inverter on
see if there is a difference in discharge pattern. It could be one of them is bad.

www.jan-kees.us
jan-kees.blog

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  • Balliol Fowden
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01 Nov 2023 10:17 #5 by Balliol Fowden
Given the youth of the batteries I would be looking at other causes before changing them.

Have you firstly checked the outgoings from your batteries? I am not sure that battery monitors can be relied upon too much. I would start by turning everything off (including inverter) and then use a multimeter to see whether there is any current draw from the batteries. Have you changed or added anything to the electrical system?

Observe the inverter to see how long it is running.

There are all sorts of other possibilities. Are your fridge/freezers working efficiently? Is venting blocked? Are door seals OK?

Have you tested the batteries. If in parallel try using alternate batteries.

Balliol.

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  • Douglas Jaarsma
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01 Nov 2023 09:27 #6 by Douglas Jaarsma
Looking to determine if I have a defective set or single battery for my house battery bank.  My batteries were replace November 2021 during my last overhaul of Janine (2 x 225ah Traction Lead-Acid).  Last year I was able to get approx 24 hours of run time without charge; besides use of generator for cooking; the inverter (Victron Multiplus 24v  3000va, 70amp) shut off due to low battery during the night.  I did a test run starting last evening at my marina before bed.  I woke up to flashing low battery on my Victron Multi-Control.  My battery monitor was still showing 78% capacity on the bank.

Prior to battery change out; my 5 year old batteries would last almost 2 days at a nature mooring; without need to run my generator for cooking.

I plan on changing out the bank next season and looking for recommendations of what batteries to change out to (ie: brand, upgrade aH capacity, etc)

Any guidance is much appreciated.

Dutch Barge Janine: 19.95m x 4.25m; 130hp John Deere Marine Diesel; Kohler Quiet Generator,
The following user(s) said Thank You: Eric Davis

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