Inverter Gurus- looking for my next “perfect” inverter
Calling all Sages!
I am an RV weekender, not a full-timer. I’m looking for my next “perfect” inverter. For the last 5+ years, I have thoroughly enjoyed my Morningstar SureSine. It has been reliable, silent, low idle draw, and just… perfect! But my needs are evolving, and I need to step up to something a little larger. I want to accomplish 2 primary goals:
Goal #1- I would like to run a 5,000 Btu window air conditioner for 2 weeks in the summer on a dry lakebed during the afternoons. The intent is to only run it when the panels can furnish 100% of the power. According to my Kill-A-Watt, it draws about 465 W once it gets rolling. I tested it on my friends KRIËGER 1100 W MSW unit and it seemed to handle it OK.
Goal #2- I would occasionally like to run my Microwave. It is labeled as a 900 W unit, but I haven’t had an opportunity to run it through the Kill-A-Watt yet.
Following are my wants, not needs:
- I would like an inverter that is not “just big enough”, as I believe that not challenging the limits is valuable for things like longevity and reliability.
- I would prefer a low frequency inverter for the startup margin in case I run inductive loads down the road.
- I would prefer a TSW over a MSW, but I’m not married to this as I can keep my SureSine if needed for the more sensitive stuff I power.
- I would like something with a low idle draw.
- I would prefer to spend around $500 or less but recognize that may not be realistic.
My system is currently configured as follows:
- 3, 157 W, 75 Vmp TransformSolarTM panels permanently mounted on the roof, and 2 more to be temporarily mounted in the desert. (That was not a mis-type. They really are 75 Vmp each. These are odd ducks that are no longer manufactured.)
- Connected by <10 feet of 10g wire to a Morningstar MPPT-45 charge controller.
- Wired via <8 feet of 4g cable to a series/parallel bank of 4 208AH GC2s. The battery bank, Trimetric shunt, and 400 A catastrophe fuse are all wired up with 2/0.
- The SureSine is connected with ~2 feet of 2/0 cable and the new inverter will have the same. There are 3 dedicated outlets hardwired to the inverter in convenient locations.
Even though I don’t need the charger or transfer switch, I really like the AIMS PICOGLF25W12V120AL (https://www.aimscorp.net/2500-watt-low-frequency-pure-sine-inverter-charger-12-vdc-to-120-vac.html) which can be had for ~$500. What kills me about it though is the idle consumption of 55 Watts and the Peak Efficiency of 88%. I suppose I could keep my SureSine and only turn this one on when I need it though.
So, what are your thoughts? What is out there that I haven’t seen yet? What would you do?