question

Hi @pontus

What steps have you taken to try and resolve a possible issue?

1. Is the firmware installed the latest?
2. Have you reset the device to factory defaults and tested it again?
3. Have you disconnected the Bluesolar from everything for a couple of minutes and tried again? (IMPORTANT - Reconnect loads (turned off) first, then battery and last solar
4. What is the voltage of the battery measured at it's terminals? The same as in the app?

The good news is that Lithium battery technology is a bit more robust than LA. Think of how many times a mobile phone battery may have been completely depleted and then recovered again.

Let us know after you confirmed the above was done and did not resolve the issue.

Regards

Etienne

Thanks @ejrossouw your quick reply. I will try to provide some more details about my set-up, which is currently in a lab.

• 40 Ah LiFeYPO4 12 V battery (GWL, matched cells, no BMS)
• BMV-700 ( firmware : 3.10 ) connected between controller an battery
• BlueSolar MPPT 75/15 ( firmware : 1.50 )
• VE.Direct Bluetooth Smart dongle ( rev2, firmware : 2.23, bootloader 1.10 )
• Victron connect app for iOS 5,27
• 50W Led strip acting as load connected through an amp-meter to load terminal off controller
• Adjustable powersupply acting as solar panel connected to PV terminals of controller
• No jumpers present in controller, all settings managed in the iOS app.

After disconnecting everything form the controller and letting it rest for some time i connect according to order in instructions; Load, Battery, "Solar panel".

When powering up, after a shutdown with load-on-state, and turning on the load ( electrically ) the following happens.

• Voltage measuered with multimeter on battery terminals 13,13
• Voltage reported by controller : 13.02
• Voltage reported by BMV : 13.13
• Battery current reported by BMV : -4,80 A
• Battery current reported by controller : -4,40 A
• Load current reported by controller : 4,4 A
• Load current reported by amp-meter on load terminals : 4,78 A
• Controller becomes lukewarm within 30 minutes
• Voltage on controllers load terminal is about 1,5 V lower than on controller battery terminals

At this time the load is active and the led strip is lit up.

When I switch to a load configuration that should cut off load, either "always off", a custom setting with a cut of voltage higher than current battery voltage, or with a shutdown in load-off-state the folling happens:

• Battery current in app changes to 0 A
• Load state in app changes to Off
• Load current in app changes to 0 A
• Load current in BMV stays the same
• Load still on, led strip shining.

Switching on the load, either using "always on" or a custom setting affects nothing excpet load state in app now shows On.

All this is regardless of settings for the Tx/Rx-ports and street light. It's also independent of "solar panels" voltage, i.e. charging or not.

Key findings:

• Load seems fixed at on-state regardless of relevant settings.
• There is a slight discrepancy in current reading between battery and load, load-current is 0,4 A lower than battery-current according to controller.
• About 1,5 V voltage drop between controllers battery and load terminal

I bought the regulator 2015-05-15 (from https://www.voltpower.se/) for a solar charged cargo bike -project, that never took off. And it has been in storage since the summer of 2015. Now, when i bought a new LiFeOp4 for another project i picked up the controller again, discovering this load-cutoff-issue.

Is it even worth sending it back after five years? Whats' the warranty time on these controllers?