Recent content by fat_old_sun

I based my comment on my observations with which I started this thread. Your data shows that the MPPT input voltage was 113.9V, less than the rated max of 250V and current was ~40 Amps (assuming that your battery bank 48V), less than 50% of the rated max output current. This is the sweet spot...

Trying to come up with ways to manage heat is good, but a reputable vendor like Victron should not be making controllers that waste 10-15% of the harvested power in the heatsink. We need a a MPPT solar charger that 95% or more efficient at the rated max input voltage & output current.

In principle, this would work. However, it'll take a very long time (100 hrs or more) to complete the process since you're approaching the target voltage asymptotically. Despite widely used, voltage based charging is not the correct approach. However, it is easy to implement. Since we're tying...

I'm wondering why the Epever running a lot cooler? The Victron is probably dissipating 30-40 Watts, 10-12% of the power delivered to the batteries.

In the last 3 months we have encountered two RV's with Victron Smartsolar 100/30 MPPT's with very high (65+ C) heatsink temperature. In both cases, the controllers are connected to four 110W panels in series and were delivering 28-30 Amps to the bank. IR camera showed the entire heatsink glowing...

Mods: If this doesn't belong here, please move it. Amazon requires registered trademarks & brand names for items sold on its platform. It's a lot easier to get the USPTO to approve if the trademarks & brand names are unique.

Electrodacus is not a MPPT controller. It uses a relay to connect the panels to the batteries like a PWM but fully disconnects at absorption voltage, unlike a PWM which adjust the duty cycle to maintain the absorption voltage for a specified period.

You're getting 300 Ah at 48V! The overall energy is 300Ah times 48V = 14400 Watt-hrs your 24V system was 450 Ah @ 24V with a energy capacity of 10800 Watt-hrs.

The resting voltage of a fully charged (100%) 12V LFP battery is 13.8. Your Victron appears to be accurate, showing a net draw of 25Ah from a 600 Ah bank or 96% SoC.

use a timer driven switch to switch the input of MPPT from the panels in the east, south & west sequentially.

not quite! 2023 Autumnal equinox is at SEP 23 2023 250 AM EDT https://www.weather.gov/media/ind/seasons.pdf

A a new 220 Watt nameplate panel would have a Voc*Isc value that is 10-20% higher. The ratio Isc*Voc and Imp*Vmp is called the Fill Factor. On a clear day, properly orient the panel to the Sun & measure the Isc. Compare the measured Isc to the value on the label. It should be close. Voc (or Vmp)...

An option - a Bogart Trimetric & its WiFi Module. The WiFi range is 300+ ft in unobstructed settings. The battery info is presented on a local web page the module serves, so OS agnostic. It can also join your starlink router & be accessible remotely.

+0.05%/C for Isc vs -0.5%/C Voc If the panel is at 45C, Isc goes up by 1%. For OP's panels' this amount to about 85 mA.

I assume you're measuring the open circuit voltage & short circuit current. The product of these values will always be higher than max power value (Imp*Vmp). However, Voc and Vmp track each other in a 1-1 manner. So, if the Voc of a used panel is X% below the nameplate spec, you can...