100v dc volt monitor??
- Thread starter The Kid
- Start date
geeeyejo1
1 kW
I have this same voltmeter wired to my LIFEPO4 pack to monitor voltage - be aware that it will drain your pack significantly over time - something to consider with LIPO. I use mine while charging to monitor the voltage, then disconnect the fuse for storage (disconnects the voltmeter too as they are wired in line with each other) To check the state of the pack; I just touch my fuse to the fuse holder terminals and look at the reading...ian.mich said:
Avoid having anything attached to any battery for storage. You can probably tolerate a uA or so, but most any meter is going to take a few orders a magnitude more and should not be left attached. That eBay meter claims 15-20mA consumption, which would not be noticeable while using the bike. For storage, it will discharge the battery if you give it enough time. It will be slow, sure, but leave anything connected 24/7 and the power consumption starts to really add up when you're talking about several months of storage.
liveforphysics
100 TW
ian.mich said:
How many days does it last if your power goes out or charger malfunctions or whatever and it was ridden till empty? (or near empty)
I personally hate to even exceed 100uA idle draw on even a huge battery.
dogman dan
1 PW
Best advice is to charge to 70-80%, unplug everything including any bms, then monitor voltage every two weeks or so with a regular voltmeter. Cool storage good, but not mandatory. Room temp is fine.
If you can't unplug the bms, store it full, and recharge it at least monthly, perhaps even every two weeks. When recharging, leave it on the charger for a day or two, or till you have a way to know all cells are full and balanced.
Rely on an alarm made from parts manufactured in china? NO WAY. Get off your ass twice a month, and take a peek at the voltage. There are cheap lvc alarms for lipo, some even adjustable. But they are pretty sketch. If an alarm goes off, and you don't hear it till later, did anybody hear it? Like the tree falling in the forest. So you wake up, and find you slept through your battery dying because you wouldn't do a simple check twice a month.
Best thing? install jst plugs on the battery so once in a while you can monitor the voltage of the packs individual cell voltages with a Cellog 8. Pack voltage dropping 3v may mean nothing much spread among 16 cells, or it may mean that one cell just died.
So if you just monitor pack voltage, I'd want to know what's up if it dropped more than a few volts in storage, once it had stabilized at the voltage you get after 24hrs after a full charge. (if you stored it full that is)
If you can't unplug the bms, store it full, and recharge it at least monthly, perhaps even every two weeks. When recharging, leave it on the charger for a day or two, or till you have a way to know all cells are full and balanced.
Rely on an alarm made from parts manufactured in china? NO WAY. Get off your ass twice a month, and take a peek at the voltage. There are cheap lvc alarms for lipo, some even adjustable. But they are pretty sketch. If an alarm goes off, and you don't hear it till later, did anybody hear it? Like the tree falling in the forest. So you wake up, and find you slept through your battery dying because you wouldn't do a simple check twice a month.
Best thing? install jst plugs on the battery so once in a while you can monitor the voltage of the packs individual cell voltages with a Cellog 8. Pack voltage dropping 3v may mean nothing much spread among 16 cells, or it may mean that one cell just died.
So if you just monitor pack voltage, I'd want to know what's up if it dropped more than a few volts in storage, once it had stabilized at the voltage you get after 24hrs after a full charge. (if you stored it full that is)
