BlueSmart Charger does not show any current in Absorption mode

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darsma asked Apr 8, '19

BlueSmart Charger does not show any current in Absorption mode

Just tried to connect various batteries (from 7Ah to 60Ah) to charge with new BlueSmart 12/7 charger and the process is always the same:

1) when battery is connected, it is tested and mode is determined. I think it's OK.

2) although remaining power in batteries differs - no one (from 6) stayed in "Bulk" mode more like for a second. I think it should last longer for empty batteries.

3) when "Absorption" mode is on, current and voltage on Android App is displayed. While voltage showed some meaningful numbers, current was always showing zeroes. I think it should not be 0.00A in any condition.

4) after some time Float mode is on, then voltage and current showed meaningful numbers (i.e. 13V, 0.5A) but no zeroes. It shoul be OK.

5) if 60Ah battery is 10V before charging or 10Ah 12,5V - the charging till "Float" mode longs no longer than 2 hours. I think charging time should be longer thant 2h for empty 60Ah battery.

I'm not sure that my charger is OK. What do you think? Will appreciate any comments.

battery charging charger VictronConnect

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Answer 1 · 2019-04-08T14:40:17Z

Paul B answered · Apr 08, 2019 at 02:40 PM

If your battery is that flat then the internal resistance will be high and thus no current will flow.

just leave it like that for 24 hours and restart it as often as you can so that it switchs back to bulk

bulk ends at about 14.2 volts NO matter if the current is zero or what ever.

absorption ends after a time period at 14.2 volts no mater what the current is

then it drops to the float voltage. around 13.6

Basically you may recover the battery but it does not sound hopeful

you may need a higher voltage charger to get through the internal resistance then after it starts charging you can return to the victron unit

Good luck with the battery

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Answer 2 · 2021-12-21T16:22:40Z

macmillc answered · Dec 21, 2021 at 04:22 PM

This is most likely the fuse in the charger itself. take off the plastic cover where the wires connect and there is a 40amp fuse. I had the same issue and mine was just the fuse, not the batteries.

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w5ll commented · Mar 23, 2023 at 12:13 AM

Wanted to follow up and add that I had this exact same issue. The fuse in my unit was not blown however the fuse on my power lead that connects to the battery was. Replaced it and charger works great.

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