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Unread 04-05-2016, 03:37 PM   #21
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Default Re: lithium low voltag cut off

No. You should not have continuity between the two negatives. That is what Isolated is all about.
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Unread 04-05-2016, 03:43 PM   #22
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Default Re: lithium low voltag cut off

Ok, thanks. That's what I thought. I'm talking to a local shop that has a 5 wire 35 amp so he thought it was. I stopped by, none of his techs were there but I got him to check the two negatives and there was continuity on them. So I just wanted to confirm it.
Thanks for the help.
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Unread 04-05-2016, 03:48 PM   #23
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Default Re: lithium low voltag cut off

Just because You don't get continuity it may not mean it is isolated as you don't know the internal circuit or how it was tested.

It could just have an internal diode to protect against reverse polarity or even disabled until powered up.

If it is truly isolated You should not get a voltage reading using the input negative and the output positive wires.
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Unread 04-05-2016, 03:49 PM   #24
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Default Re: lithium low voltag cut off

Almost all of the reducers I have researched are not isolated. You can buy an isolated one from an electronics supply house - and you can get a very low current one just to run your meter.
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Unread 04-05-2016, 04:08 PM   #25
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Default Re: lithium low voltag cut off

Ya it looks like that's what I'm going to have to do.
I'll probably get the one Sergio linked for the meter and get a reducer from ScottyB.
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Unread 04-05-2016, 04:14 PM   #26
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Default Re: lithium low voltag cut off

I kept meaning to post this question on another thread Motor power/voltage monitoring question

So is this quote from the above mentioned thread correct or not?

Quote:
Originally Posted by rottie View Post
iI will work for any system, but it must be in the negative lead if you use it w/o a isolated supply.
If use an isolated power supply, it can go in either lead regardless of controller.
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Unread 04-05-2016, 04:41 PM   #27
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Default Re: lithium low voltag cut off

It is correct for that kind of meter linked:
Power Supply 10V~90V (external/Internal power supply)

Measuring range:
(1)Volt 0~120.0V / Amp 0~500A, external power supply
(2)Volt 10~90.0V / Amp 0~500A Internal Power supply
Please note that when not using an "external" power supply (2) you are limited to the max of the internal supply (90v). The JLD404 is only 30v power supply.

Some meters have a pretty good internal voltage isolation and can be used without any special "isolated" power requirement, but unless specifically noted in the specifications, I would used the cheap POL (Point of Load) reducer.

By the way, do You need to keep that meter powered all the time to track AH used?
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Unread 04-05-2016, 04:47 PM   #28
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Default Re: lithium low voltag cut off

Ok so that one didn't even need a separate power supply.

From what I understand the 404 doesn't loose it's memory when off.

Thank you.
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