ynot 29 Posted March 6 Share Posted March 6 So apparently Volvo have said that the main cause of MDI box failures is caused by solar panels attached to the system and the voltage getting higher than 13.8v which kills the MDI which in turn stops the motor and won't start or charge or do sweet bugga all unless you get out the screw driver and short the relays old school...and yes I know how to wire the emergency start button but that voids warranty so if the above is true how do you get around a solar charger charging AGM's at 14.7 which will keep the VSR engaged which also means the start batt see this as well (SLA) and if both power switches are on with solar panel attached this must mean that the MDI box see this high voltage at times as well. I am guessing the VSR can be engaed and back feed from house to start as well...i do not really know how they work If all this is right, then surely Volvo must have built a box that can handle a certain percentage of over voltage knowing that they sell boat motors, and most boats have solar and newer type batteries such as AGM and VSR's and things. I asked them today if the box could be ditched and set up relays for glow and stop and start and gauges and alarms etc. but they said NO WAY it voids engine warranty. I wonder where they would sit if it really happened at the worst time and ya lost ya boat or family members when they are well aware of the issue that is in an issue solar or not. I have also read that relocating them off the engine is a solve but Volvo says nope that is not an issue. I had one die on me under the harbour bridge with no boom on the boat (mast was coming out) on a no wind day so had to call coastgaurd and get a tow. Thanks I have attached a pic of what I am talking about of a possible setup that may cause this to happen.... any thoughts on how to set this up would be appreciated. Quote Link to post Share on other sites
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