Lithium battery conversion

[bluesriff33]

I have ordered two 100 ah LiPo batteries.  I installed a lithium compatible charger converter.

my question is, when I test the converter with a multimeter it reads 14.6 amps at the converter, but when I test at the battery cables (without batteries installed yet) the meter flat lines.   Do I need the new batteries installed to test at the cables?

thanks

[valhalla360]

Assuming you are plugged in and the converter (aka: charger) is powered up. The 14.6v sounds reasonable it should be the same measured across the terminals on the converter and on the cable ends when they get to the battery box. 

If you measure 0v at the cable ends at the battery box, there is presumably a break in one or both of the cables. Check for loose connections and if none are obvious, your multimeter should have a continuity setting. With the converter powered down, check each cable for continuity. Once you find a bad one, check for cuts in the insulation, breaks in the wire or loose connections until you are certain, the cables are good all the way from the converter to the battery box...at that point, the voltage across the cable ends at the battery box should match the voltage at the converter terminals.

[MNtundraRet]

I missed the fact you stated am/s. You must have meant volts.

An ammeter is a good option. It will let you know how fast you are using up the batteries.

[opnspaces]

Assuming you meant 14.6 volts and not 14.6 amps. When you tested the cables were you still on shore power? Assuming the test at the converter and the test at the cables were in the same testing session I would look for a blown fuse or re-settable circuit breaker (often mounted under the tongue) that is stopping the current to the cables.

Alternatively measure the voltage at the batteries when not hooked up the the RV. Write that number down as Battery Voltage. Then attach the battery to the cables and connect the shore power cord. Now measure the voltage at the batteries. Do you get Battery voltage or do you get a larger voltage signifying the charge current is getting to the batteries.

If you have solar you might want to cover the panels for these tests.

[MNtundraRet]

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@bluesriff33 wrote:

I have ordered two 100 ah LiPo batteries.  I installed a lithium compatible charger converter.

my question is, when I test the converter with a multimeter it reads 14.6 amps at the converter, but when I test at the battery cables (without batteries installed yet) the meter flat lines.   Do I need the new batteries installed to test at the cables?

thanks

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Your post is confusing. What were you testing when the meter flat lined? The batteries or the converter?

I would install the batteries.