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Solar Mike Guru Joined: 08/02/2015 Location: New ZealandPosts: 1247
Posted: 10:23pm 23 Aug 2026
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Edit: I consulted an AI, ChatGPT, it recommends using 2 x 10uH inductors
Mike Edited 2026-08-24 09:08 by Solar Mike
Footnote added 2026-08-24 10:04 by Solar Mike ChatGPT recommends if paralleling two H-Bridge power modules, then it is more efficient to have one running 180 out of phase in the 40 Khz SPWM inputs. This is easy to do with the PICO2 RP2350.
Godoh Guru Joined: 26/09/2020 Location: AustraliaPosts: 701
Posted: 11:37pm 23 Aug 2026
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Hi Mike, just wondering , as you said you have plenty of batteries and are going to make up a 110 volt bank or so. Whether a GTI inverter running off that bank of batteries would have enough grunt to help start the pump. You would need to have some sort of method of getting the GTI to start up before you tried to start the pump, but it may just give enough kick to get you over the line. Pete
Solar Mike Guru Joined: 08/02/2015 Location: New ZealandPosts: 1247
Posted: 12:00am 24 Aug 2026
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Will a GTI work off a 110v bank??, can think of other Hybrid inverters that would work here to sync with the generator AC and boost output current, but quite expensive.
Mike
Godoh Guru Joined: 26/09/2020 Location: AustraliaPosts: 701
Posted: 01:27am 24 Aug 2026
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HI Mike, some GTI inverters work off reasonably low input voltages. I am using Zeversolar GTI inverters on my system, they are supposed to work from 100 to 500 volts input.
I was thinking that you could use the batteries as pretend solar inputs. So plugging the batteries into the MPPT controllers on the GTI inverters. Then AC coupling the inverters to your current inverter. You would need to make sure that the GTI is backfeeding to be sure that it will come on in time to assist the battery inverter.
Of course that depends on whether you have one laying about or can pick a second hand one up that will run on around 100 volts from the panels or in your case battery bank pretending to be panels
Pete
Revlac Guru Joined: 31/12/2016 Location: AustraliaPosts: 1302
Posted: 11:47am 24 Aug 2026
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If the Toroid isn't salvageable a C Core transformer will do the job if you can find one, they were sometimes used on 1980"s Telecom rectifier battery charger's and a few other things, they will be plenty good enough for motor starts. Cheers Aaron Off The Grid
analog8484 Senior Member Joined: 11/11/2021 Location: United StatesPosts: 212
Posted: 04:21pm 24 Aug 2026
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GTI is an interesting idea but the backfeed issue could be tricky. Also, depending on the GTI model, it may stop producing power immediately if the AC voltage is distorted too much by the load startup surge.
Ideally, a parallelable voltage source inverter that has generator/grid power assist/shaving functionality would be more suited for the task. AFAIK, only commercial inverters (e.g. Victron) are available with such functionality.
Notice. New forum software under development. It's going to miss a few functions and look a bit ugly for a while, but I'm working on it full time now as the old forum was too unstable. Couple days, all good. If you notice any issues, please contact me.
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