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After updating the mppt firmware my battery charging isn’t the same.
i have 2 x 370w solar panels with 2x mppt 100/30 smart chargers.
With any form of daylight I am getting a charge and remains that way till dark but as of the update it seems as though something isn’t right.
i have daylight but no charge going in to the batteries. I have a -4.5amp draw and my batteries have dropped to 12.75 volts. Normally they are charging all day with no negative draw till dark.
Am I missing something here?
Hi @Hoverjocki
It looks like your panels are not configured correctly, so the PV Voltage is not getting high enough to start charging.
It needs to be at least +5V higher than the battery voltage (ideally much more). Your system is showing a difference of only 2.59 V (12.76 batV - 15.35 solV).
Solar voltage needs to be over 18 V minimum to start.
Your panels will need to be wired into a series configuration, they look like they are currently wired in Parallel.
Please read the Solar Section 4.10 of the Wiring Unlimited guide for more info.
They are single panels with their own mppt charger, they are not connected and are dependent of each other.
From the mppt chargers they out put to a bus bar then to the batteries.
Not sure I understand what I’m to do. 
Hi @Hoverjocki, I am using the same 2 x LG 370 Wp set up, but with just one MPPT100/30. Panels connected in series, as @Guy Stewart (Victron Community Manager) recommends. Why use 2 MPPTs? When in series, the combined voltage does not go over 100 V, so one MPPT100/30 will work and you will much more easily reach the +5V the MPPT needs to start charging.
Hi.
This setup is installed on a sailboat. Im using 2 chargers so that if I get shading on one panel from the boom or when the sails are up it won’t diminish the power from the 2nd panel.
That’s the idea anyway.
Regards
Justin.
Hello @Hoverjocki, when you measure the PV voltage with a multimeter, what do you read?
best regards, Rob
Hi Rob.
Im away from my boat till next week but I’ll put up pictures of my panels before I left. i was told the chargers only take what they need to charge the batteries so I’ve always seen low wattage.
I’m seeing I have to have +5v above battery voltage for the panels to charge but my charging amps are low.
I’m still learning to understand this system so apologies if I’m not getting it.
