HELP - Leaking starter batteries / rotten egg smell - Travelling across Africa - Stuck

Hello Community,

Hope someone can guide me :-)

We are in a professionally built expedition truck with Victron systems. Over the last two days we have been smelling rotten eggs. I started with the toilet but ended up at the starter batteries :-(

Both starter batteries are leaking (2 x 12v series).

Q1 Is it usual for both starter batteries to fail together or is this symptomatic of an external issue ( overcharging issue or something else)?

We are parked up (Corona 19) with a shore supply feeding a Pheonix Multiplus that charges our leisure batteries and starter via a Cyrix-i 12/24-120 bidirectional voltage sensitive relay. A Victron MPPT solar charger is a second charging source (added a month ago to replace a PWM unit).

About two days ago the inverter displayed a Bulk Protection alarm. And I reset it. I didn't know what this was, but the community has told me that it means the max bulk charging time of 10 hours was exceeded. I suppose this is associated with my problem.

I noticed yesterday that my MPPT was generating 17A, but the BMV indicated only a few amps charging the onboard leisure batteries and I wondered where the rest was going as I had not much load switched on. I guess it was going into the started batteries.

Q2 Can anyone through some light on what is going on? Have the batteries failed as a result of a system issue or of their own accord and just need replacing?

Many thanks in advance to responders.



Multiplus & MPPT have identical charge settings (bar current limit):

Vab = 28.8v

Vfl = 27.6v

Current limits are 45A and 30A respectively.

Voltage across starter battery terminals (chargers off): 24.8v

Voltage across leisure batteries (from BMV) (chargers off): 25.5v

Voltage across starter battery terminals (MP charger on): 27.6v and climbing slowly

Voltage across leisure batteries (from BMV) (MP chargers on): 27.7 and climbing slowly

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2 x Fronius 3kW Primos (1 on the input, one on the output)

7kWh of BYD batteries

Currently everything is working ok, except there is no pv production being recorded and displayed by any of the Victron devices.

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I have a few questions about installation of Lynx 1000 Distribution

Current Set Up: 550W Go Power Solar with Charge Controller, 100W Go Power Solar with Charge Controller Portable, 400Ah Battleborn Batteries, 2000 Go Power Inverter, 40A DC/DC Charger, Blue Sea 12V Block, Junction Studs, Converter Charger

I have 2 Lynx 1000 Distribution Boxes, using Shunt from Victron B-712

I’ve linked up the 2 Lynx boxes. I have all the items connected with proper fuses POS to POS and Neg to Neg

My questions are:
1. I assume using this diagram, my batteries are charged via the shunt?

2. Does it matter about the placement of each item where is it installed on the Lynx?

From left to right
Lynx #1 - Slot 1 is Inverter, Slot 2 is MPPT Charge Controller, Slot 3 is MPPT Charge Controller, Slot 4 is DC/DC Charger

Lynx #2 - Slot 1 is 12V Fuse block, Slot 2 is Converter Charger, Slot 3 is Junction studs, Slot 4 is Open


Thought recommendations thanks in advanced Ed,

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0 Answers