Goal Zero  Solar Charging Optimization Module

Before you buy this unit, make sure that you don't want to use an yeti goal zero expansion tank because you cannot have both units in the same goal zero yeti machine. You can have the MPPT or the expansion tank module but not both which is a big drawback. This should tell you this before they sell you one or the other. I purchased this unit with a yeti 1400 and wanted to add an expansion tank and found that I cannot have both of these units installed and that the expansion tank will not work without the module that fits in the same location as this module.

The rate of charging through this MPPT on my set up is quite significant. Instead of 60 watts it charges at 130. This unit stopped working after 3 months. I just began the process to have it replaced under warranty. I’ll keep my fingers crossed. I’m sure there’s a positive post-exchange review in the making.

You'll notice these are built in to the newer Yetis because it is simply foolish to make a charger without it- esp at this price point. It did improve performance, but mine stopped working after less than half a year. GZ customer service hemmed and hawed about whether it was defective, and then finally ghosted me, so beware!

So far the mppt controller works well: Doesn’t really provide 40% improvement but definitely 10-20%. Recommend it for solar panels. I really do like Gail zero products and REI has always been great to work with.

I bought this to add to a second solar charging circuit to a Yeti 1000X lithium and it's a great way to charge with two sets of dissimilar panels. In my setup, I have 2x100W panels in parallel that are roof mounted on a small trailer. They are not GZ and have a 25V Voc rating so I need to run them off the built in MPPT. I also have a Boulder 200 panel that I use when power draw is high for my setup, and that I can plug into the expansion module to use both panels optimally. In my setup, I've seen over 400W simultaneously on the two channels combined, which really adds the juice. The limit I've seen here is that this unit has a 22V max which is quite low vs the more modern stuff, but GZ panels have a Voc under this so it works out fine.

I bought this for my Yeti 1400, and am using it with 3 x 100 watt panels on my garage roof. A like for like comparison by unplugging from standard solar input and plugging into the MPPT controller showed an immediate +30% increase in input wattage. Very pleased with the results. Mains charging is faster too using my home made 250w power supply.

Running this thing for several days now. The period of solar charging is extended by at least 2 hours each day (starts earlier and stops later). The charge initializes at lower wattage (amps). Charging per se is (seems to me) faster. Good value.

The MPPT module is a must have with Yeti 1000 or greater sizes. It simply converts access panel voltage into storable power. Charging time is reduced. and up to 25 amps of input, also you can still use the PWM controller inputs. You'll love this.

The MPPT made the difference on a dark, cold, cloudy Michigan autumn day between no charging at all and a solid 40 watts from 3 panels. It also optimized the 120V power supply from 65 to almost 80 watts.

I bought this because it had the hi input port, only to discover that it does not have the connection to the tank. I have yet to find a module to charge the tank with solar panels