question

Hello, thanks for the information. If I understood that "correctly" now - then my "matter" would be possible "without a battery", because the „SUN INVERTER 12/250“ can convert „a part“ of DC-current (And in an emergency - I assume - also the maximum generated current) from solar panels - to AC-current „directly“. Should my battery "unexpected" (So in case of emergency) be broken - and should I ("purely theoretically" - exactly at this "time") need alternating current (of course by "ideal weather conditions" - and should the required alternating current - not exceed the amount of electricity generated by solar panels) – then I could for example operate an AC device – even “without” a battery („As long as the solar radiation is sufficiently strong”). Unfortunately, I have no technical education - and therefore I decided - to ask here.That's exactly what I wanted to know. Thank you.

Hello,

thank you very much for the information. I am of course pleased to learn - that it was possible for you (Real "by mistake" - as you mention yourself) - with a "separate" MPPT solar charge controller and inverter - to pass AC power to an AC device (Also "without battery") "for a short time". Of course, I agree with you - that this "scenario" - is associated with various "dangers" - or that an AC device ("AC-load") could be damaged as a result. I was rather thinking in the emergency scenario - if I could use an AC device (In "real" emergency) at least a few minutes (With the SUN INVERTER) - without a battery connected to SUN-INVERTER. The AC unit should (I suppose) probably not "contain" too "much" (or any) electronics - because then the danger (for damage) could be even "higher". One should (I suppose) have to install an undervoltage protection (Or other "protective devices" , or "protective measures - such as overvoltage protection, etc.....)switch between the AC unit and SUN-INVERTER - to keep the dangers of undervoltage (Or overvoltage, etc....) - somewhat lower. An AC-device could (I suppose) but (Even if I would use undervoltage or overvoltage protection switch) break - if too much electronics in the AC-device - would be installed. A few years ago, electricians ("Without advance notice") had turned off and turned on the power (in the whole building - where I live) - for repair work - several times. And on that day, all of a sudden, my AC refrigerator and AC SAT receiver - stopped working. And my neighbors suddenly - just like me - had "broken" AC-devices. Probably it came to "undervoltage" or "overvoltage" at that time - what some AC devices did not "tolerate".

And now I write something about the "clouds" of the sky: I think just like you - that against "clouds" (And bad weather) – nobody can something „do“ - "without a battery". "SUN-INVERTER 12/250" can provide max 200 watts (At 25°C) according to "user manual" (Or short term peak power would be 400 watts). That means (I assume) that one could connect rather "weaker" AC devices (in which - in the best case - no electronics should be installed) - to "SUN-INVERTER 12/250" - "directly" (Thus without battery). And one should (I suppose) also use an inrush current limiter or starting current limiter (Especially then - if the inrush current or starting current of the AC device would be "too high"). For the "emergency" I have a "POWERSTATION" (With LiFePo4 battery and built-in inverter) - which (in case of emergency) "hopefully" would be sufficiently charged - so that I (in case of emergency) immediately have AC power - available. With the help of the (charged) Powerstation, there would be no problems with the "undervoltage" (or overvoltage, bed weather - etc.....) - which is theoretically to be expected every time - if e.g. the sun is "covered" (completely or partially) by passing clouds and I would use "SUN INVERTER 12/250" - without battery.

I wanted to ask - if you maybe know - if Victron offers the same model (So "SUN INVERTER" - 12 VOLT) with higher power? So it should be built in one device - the solar charge controller and inverter.The "stronger" models should perform 500 WATTS or 1000 WATTS - so that you can use (as I said - really only in an emergency - and only "short term") - "suitable" AC devices ("without battery") - which however need "more" power. Thanks.