Moosey Posted December 7, 2019 Report Share Posted December 7, 2019 So, I have checked my batteries and the bank of 4 show 12v on my multimeter and I have taken the inverter out, hooked it to the car battery and it works fine. When I hook it back to the boat battery bank, it does this .... any ideas gratefully received. Link to comment Share on other sites More sharing options...
Mike Hurley Posted December 7, 2019 Report Share Posted December 7, 2019 (edited) If your battery bank shows just 12.0 volts then there is your problem, have you tried it with the engine running? Cant see the video by the way. Edited December 7, 2019 by Mike Hurley Link to comment Share on other sites More sharing options...
Alan de Enfield Posted December 7, 2019 Report Share Posted December 7, 2019 If your batteries are showing 12v then they are discharged (about 12.7 -12.8 is fully charged when tested at least 1 hour after charging has finished and there is nothing using any power) Try turning everything off, start your engine and get it up to about 1200-1300 RPM and see if the inverter works OK. If it does then you need to charge your batteries for (probably) 8 hours. If your batteries have been left for any period of time at 12v then they will have become damaged (sulphated) and may need replacing. Getting batteries FULLY charged is a boaters biggest challenge. Try and see if running the engine improves the situation, then come back with the result. Link to comment Share on other sites More sharing options...
Dr Bob Posted December 7, 2019 Report Share Posted December 7, 2019 Yep, video doesnt work on my Mac. When quoting voltages, try and quote to at least one place of decimals.... so 12.5V rather than 12V .....and try and take the voltage with zero loads (or as near as you can to none) and NO solar input. How old are your batteries and how do you make sure they are fully charged on a regular basis? Link to comment Share on other sites More sharing options...
mrsmelly Posted December 7, 2019 Report Share Posted December 7, 2019 3 minutes ago, Dr Bob said: Yep, video doesnt work on my Mac. When quoting voltages, try and quote to at least one place of decimals.... so 12.5V rather than 12V .....and try and take the voltage with zero loads (or as near as you can to none) and NO solar input. How old are your batteries and how do you make sure they are fully charged on a regular basis? The video doesnt work on a proper computer either It will prob be a case of flat and or quite likely knackered by now batteries. Link to comment Share on other sites More sharing options...
WotEver Posted December 7, 2019 Report Share Posted December 7, 2019 5 hours ago, mrsmelly said: The video doesnt work on a proper computer either That’ll be because the video is in fact a still. Bit I can guess what would be in it: an inverter going “eeeeee”. Link to comment Share on other sites More sharing options...
Mike Hurley Posted December 7, 2019 Report Share Posted December 7, 2019 4 minutes ago, WotEver said: That’ll be because the video is in fact a still. Bit I can guess what would be in it: an inverter going “eeeeee”. With some flashing lights as well i guess. 7 hours since the OP posted, could have charged his battery's by now. Link to comment Share on other sites More sharing options...
Alan de Enfield Posted December 7, 2019 Report Share Posted December 7, 2019 1 hour ago, Mike Hurley said: With some flashing lights as well i guess. 7 hours since the OP posted, could have charged his battery's by now. Or now so flat he has no electric to feed his 'puter. 1 Link to comment Share on other sites More sharing options...
Moosey Posted December 9, 2019 Author Report Share Posted December 9, 2019 You fellas are quite right....`'eeeeee`' with green and red light dying out. I do believe I have sulphated batteries so I'll change them out....thanks all for your input I have learned a lot Link to comment Share on other sites More sharing options...
Alan de Enfield Posted December 9, 2019 Report Share Posted December 9, 2019 2 minutes ago, Moosey said: You fellas are quite right....`'eeeeee`' with green and red light dying out. I do believe I have sulphated batteries so I'll change them out....thanks all for your input I have learned a lot It is imperative that you learn how to charge your batteries, otherwise your new ones could be 'toast' within a matter of weeks. How do you charge your batteries currently (Battery charger, generator, engine) ? For how long do you charge them ? How do you monitor your battery SoC (State of Charge) How do you know when to start charging ? How do you know when to stop charging ? Have you done an electrical audit to assess your daily usage (in Ah) ? Link to comment Share on other sites More sharing options...
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