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tkepler asked

SmartSolar MPPT 100/20 Stuck in Float until hard reboot

I have two MPPT's and they keep getting stuck in float mode and will not go back into bulk after they have hit float. I have consulted several other professionals and we cannot find anything wrong in the settings

I tried basically everything. Set to the stock LiFePo4 charge profile, factory reset, increased the float voltage, decreased the re-bulk offset, disabled one of the two controllers so it couldn't be confusing the other. The only way I have gotten them to charge is a complete reboot or I remotely updated the FW with the same version, which I think just rebooted the units.


They were working fine previously until a couple days ago.

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MPPT Controllers
1625699509794.png (375.9 KiB)
1625699575282.png (330.2 KiB)
1625699581040.png (208.4 KiB)
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klim8skeptic avatar image klim8skeptic ♦ commented ·
Why is the float voltage the same as the absorption voltage?
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wanek avatar image wanek klim8skeptic ♦ commented ·
because the victron app interface does not have a proper lithium chemistry profile, they still using the lead profile. but since lithium needs a very different charge algorithm than lead, the only way to set is putting the same value. (lithium does not need the absorption phase at all, only bulk and float).


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wanek avatar image wanek commented ·
why are you using fixed 1h absorption?
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tkepler avatar image tkepler wanek commented ·
  1. @wanek this snapshot was when I was trying different settings attempting to get it to turn on. I typically have it set at two hours.
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2 Answers
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tkepler answered ·

I thought I'd give an updated on my solution. I have been working directly with Victron to resolve the issue. Apparently, there is a glitch in the programming of the small 100/20 MPPTs for at least the 48v settings. Not sure if they were old stock that had been sitting on the shelf a while or what exactly the problem stems from but both units were RMA'd. I replaced them with a single 150/35 unit and it is working as it should. It did cost more than the two smaller units but I didn't want to risk having the same problem again.

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tkepler answered ·

@Guy Stewart (Victron Community Manager) any ideas what could be going on here?

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Guy Stewart (Victron Community Manager) avatar image Guy Stewart (Victron Community Manager) ♦♦ commented ·

Have you tried disabling temperature compensation?

Can you also take a screenshot of the detailed history view in VictronConnect?

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