architekt
New Member
- Joined
- Aug 30, 2021
- Messages
- 7
I currently have a few 12.8kwh 48V LiFePO4 giant batteries from bigbattery.com (appropriately named). They're the TREX model if anyone is familiar with them. They can handle a max continuous discharge of up to 150A. When I bought the kit from them, they shipped me a Growatt 6kw inverter. Which can only output a max of 25A. Not nearly enough to power what I thought I was going to be able to power, namely my AC and a few other things. My electrician suggested I look into getting a beefier inverter. I found two 18kw models which would provide 75A (18kw/240v), plenty to power the AC, my computer, and finish any dishwasher/washing machine loads that were in the middle of running. 18kw is a lot, but the price difference between 18kw and 15kw models doesn't seem to be much so I figure, I'm going to go with the higher model for just more amp headroom. I've been looking at two brands and I was wondering if anyone had any opinions on them:
1. Sigineer model HP18048D (product link)
2. SunGoldPower (product link)
My batteries have a "suggested charge current" of 45A with a max of 90A, and a "suggested charge voltage" of 59.5V. My current 6kw Growatt inverter only lets me supply 58.4V, but the manufacturer says that's fine. The batteries say that "bulk voltage", "absorption voltage", "float voltage" don't apply to them ("Not applicable to Lithium Batteries"). They have a low voltage cutoff valid between 40V-46V, suggested 46V.
Reading their respective documents, they look like they're essentially the same. They even look essentially the same with essentially the same features. They both seem to let me set things up the way I need, albeit not with the nice friendly UI that the Growatt has with it's buttons and LCD set up screen (sadly Growatt maxes out at a 12kw model). Franklin (everyone says they've talked to Franklin) at Sigineer says that their model has a fixed cut off voltage of 42V, which is within my manufacturer's listed range so I know that'll work. SunGoldPower doesn't mention this anywhere.
I have 2 questions:
1. Both of them have essentially the same battery selector knob/switch on the front. The SunGoldPower has a LiFePO4 setting which would output 58.4V: that's the same as what I have now with my current set up so I know that's fine. The Sigineer has what looks like the exact same setting, it just happens to also say "AGM 2 / Lithium Battery": this shows the exact same output voltages as the SunGoldPower unit. Here's the question: When choosing the battery type selector, does anyone know if that SOLELY affects the output voltage? The manuals seem to indicate this, as the charts just list boost/float Vdc per battery type. You use DIP switches to affect current and both have a knob to attenuate this between 0-100% so I can easily set my output amps to the suggested 45A. I just want to make sure that the battery type selector is only affecting the voltage and not some other parameters that aren't mentioned in the docs.
2. Does anyone have experience with either unit or brand and their reliability/quality? So far, the Sigineer sales rep seems to be really on the ball and communication has been great which gives me a positive feeling, whereas the SunGoldPower rep kind of gave me bare minimum info to my questions. Or, are there perhaps other models that someone would suggest instead that can output 18kw 75A? I'm really just looking for the high amp output. I have the battery capacity to run what I need for 8 hours (more than enough for our storms here in Pittsburgh) if I had an inverter that could handle the amp load.
1. Sigineer model HP18048D (product link)
2. SunGoldPower (product link)
My batteries have a "suggested charge current" of 45A with a max of 90A, and a "suggested charge voltage" of 59.5V. My current 6kw Growatt inverter only lets me supply 58.4V, but the manufacturer says that's fine. The batteries say that "bulk voltage", "absorption voltage", "float voltage" don't apply to them ("Not applicable to Lithium Batteries"). They have a low voltage cutoff valid between 40V-46V, suggested 46V.
Reading their respective documents, they look like they're essentially the same. They even look essentially the same with essentially the same features. They both seem to let me set things up the way I need, albeit not with the nice friendly UI that the Growatt has with it's buttons and LCD set up screen (sadly Growatt maxes out at a 12kw model). Franklin (everyone says they've talked to Franklin) at Sigineer says that their model has a fixed cut off voltage of 42V, which is within my manufacturer's listed range so I know that'll work. SunGoldPower doesn't mention this anywhere.
I have 2 questions:
1. Both of them have essentially the same battery selector knob/switch on the front. The SunGoldPower has a LiFePO4 setting which would output 58.4V: that's the same as what I have now with my current set up so I know that's fine. The Sigineer has what looks like the exact same setting, it just happens to also say "AGM 2 / Lithium Battery": this shows the exact same output voltages as the SunGoldPower unit. Here's the question: When choosing the battery type selector, does anyone know if that SOLELY affects the output voltage? The manuals seem to indicate this, as the charts just list boost/float Vdc per battery type. You use DIP switches to affect current and both have a knob to attenuate this between 0-100% so I can easily set my output amps to the suggested 45A. I just want to make sure that the battery type selector is only affecting the voltage and not some other parameters that aren't mentioned in the docs.
2. Does anyone have experience with either unit or brand and their reliability/quality? So far, the Sigineer sales rep seems to be really on the ball and communication has been great which gives me a positive feeling, whereas the SunGoldPower rep kind of gave me bare minimum info to my questions. Or, are there perhaps other models that someone would suggest instead that can output 18kw 75A? I'm really just looking for the high amp output. I have the battery capacity to run what I need for 8 hours (more than enough for our storms here in Pittsburgh) if I had an inverter that could handle the amp load.
Last edited: