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Unread 10-23-2016, 10:23 PM   #1
TFL
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Default Volt minder

Has any one used one of these on your cart.
http://voltminder.com/index.htm
I am thinking about ordering one. Because it has a low battery warning sound.
What do you think

Tim
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Unread 10-24-2016, 01:32 PM   #2
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Default Re: Volt minder

Having a Digital Voltmeter monitoring the battery pack voltage is useful, but the alarm part is of little use since the pack voltage varies as the load (amps drawn) varies and you would either be getting false alarms during operation, or not have the alarm trip point set high enough to be meaningful for the at-rest voltage.

For recharging purposes, you don't want to discharge the battery pack below 50% SoC (State of Charge), which is an at-rest voltage of 36.3V for a 36V pack. On the other hand, a fully charged battery pack will typically drop 3 to 5 volts under load, which takes the pack down in the 33 to 35 volt range. (100% SoC is 38.2V for a 36V pack)
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Unread 10-24-2016, 07:25 PM   #3
TFL
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Default Re: Volt minder

Thank you for your response. I use one of these in my camper to monitor the batteries in it and works well.
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Unread 10-24-2016, 10:14 PM   #4
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Default Re: Volt minder

Quote:
Originally Posted by TFL View Post
Thank you for your response. I use one of these in my camper to monitor the batteries in it and works well.
But does your camper have an electric motor and climb hills which in turn causes severe voltage drop while doing so? I can temporarily drop my 48 volt pack down below 42 volts while climbing the hills in our hood but I wouldn't want to discharge my batteries below 49 volts without headed back to the charger...
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