Ask PYS: Battery Monitors

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Should My Battery Monitor Be Set For 12V or 24V?, on May 08, 2018 asked:

Changes to the electrical on the boat look great but I have a couple of questions. Is the battery monitor, monitoring the house batteries only? Should the battery monitor be set for 12v or 24v? Looking forward to getting out on the boat and testing everything out! - Dave

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Do You Recommend The Victron 700 or Victron 702 Battery Monitor?, on Dec 04, 2017 asked:

Thank you for all of the electrical wiring videos on your website, they are a great help. I have a 1988 Catalina 30 with outdated and questionable wiring from the previous owner, so I'm upgrading. I have a two battery bank system (house and start). Do you recommend the Victron 700 (monitoring house only) or 702 (monitoring house and start batteries)? Thanks for all of your help. - Bruce

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My 900W Coffee Maker is Triggering the Low Voltage Alarm, on Sep 05, 2017 asked:

My commercial salmon troller has a 1600W inverter drawing from a single 8D lead-acid battery which is isolated from the two other 8Ds at night when on anchor and the engine is off. The engine has an 80A alternator and is usually running 16-18 hours per day. The biggest load we put on the inverter is a 900W standard coffee maker, which we only use while the engine is running. While brewing coffee the voltage reading on the inverter display is usually in the mid 11s and the low voltage alarm occasionally starts going off. The voltage goes right back up when the coffee is done brewing. Is this type of use bad for the battery or hard on the inverter? I have size 4 cables going to the inverter, which is what the installation manual called for, and the run is only about 3 feet. - David

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Can I Leave My Battery Charger "On" In Float Mode?, on Nov 02, 2016 asked:

I have lead acid batteries and a inverter/charger. The battery monitor is a Link 2000. When the monitor switches to the float mode, is it ok to leave the charger on indefinitely? – Doug

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Fluctuating Amperage, on May 31, 2016 asked:

I have a video of my charger display while the engine is running. At 2000 rpm, it shows that the charging voltage is constant (4.19 for the starter battery and 14.28 for the house bank), but the amperage is fluctuating all over the place, from 9.2 to 11.8A, sometimes settling around 10.4, but then fluctuating again. I understand, from our conversation, that this is not unusual? - Tim

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Voltage Draw on AGM Batteries, on May 04, 2016 asked:

What is the minimum voltage permissible to draw the house AGM batteries down to, and what would be the preferable minimum for longer battery life? - Gerry

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Useable Battery Capacity vs. Battery Monitor – Doug, on Oct 08, 2015 asked:

Can you please explain how many amp hours we have for use on our boat? We have two 198 Ah batteries. If we are not supposed to use more than 50%, does that mean we have 200 Ah to play with? Does this mean that we can run the battery to show 200 Ah used on our Link 10 monitor? I have noticed that the monitor itself is set up to indicate that we have 200 Ah. Should this be 400 or are the bar usage lights based on only 200 available hours? Or are they only showing 100 amps available for usage? Neither of us is clear on this. I hope my question makes sense.

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House Battery Bank - Ken, on Feb 25, 2015 asked:

We purchased a new motorhome last summer and I was having some trouble with keeping the house batteries charged. I am not sure if the charger I have is the best one for the job. There are 4 US 2200 XC Batteries that are charged by a Magnum ME 2012 Inverter/Charger. There is a remote (like the one you put on our boat) but it does not have SOC info and I do not know why my batteries die so fast. What accessory do I need to install to have proper SOC readings? There are two systems (a 110V and a 24V), five televisions, water pump, fans, lights, residential fridge, and a few others that all seem to run off of the battery bank when not connected to shore power. If I’m a betting man the draw from the fridge alone will kill those batteries in a matter of a couple of hours. It has a built in Onan Generator that I use to charge the battery bank, but I have to run it all the time. I do not know if my batteries were damaged from misuse when on the dealerships lot.

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Odd Battery Monitor Behaviour – Brian, on Feb 22, 2015 asked:

A quick regarding my battery monitor showing negative 60+ amps for the start battery, a group 31. I was concerned so put a meter on and it's showing 13.4 Volts which the float voltage. The two things don't seem to make sense? I am away for a month so am not too concerned as I think if I was truly losing amps the voltage would be down. The start battery is a new group 31 which I believe is a 250 amp battery.

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Battery Charging Sweet Spot and Maximum Depth of Discharge– David, on Dec 21, 2014 asked:

Working through the booklet that came with the battery monitor, how low as a % should I or can I go before needing to charge up the house; starter batteries? We left H Bay at approximately 85% and it climbed up to 93% during our crossing. Obviously the alternator is doing its work nicely. Then the monitor went to 100% after we were connected to shore power. What % would you think I should use as my low point? Before I worry about needing a charge (go for a cruise or plug in to shore or use the genset).

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